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WO2025233271A1 - Procédé de détermination continue d'informations de température pour unité d'éclairage - Google Patents

Procédé de détermination continue d'informations de température pour unité d'éclairage

Info

Publication number
WO2025233271A1
WO2025233271A1 PCT/EP2025/062188 EP2025062188W WO2025233271A1 WO 2025233271 A1 WO2025233271 A1 WO 2025233271A1 EP 2025062188 W EP2025062188 W EP 2025062188W WO 2025233271 A1 WO2025233271 A1 WO 2025233271A1
Authority
WO
WIPO (PCT)
Prior art keywords
item
phase
temperature information
information
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2025/062188
Other languages
English (en)
Inventor
Jan Gerrit LOEFFLER
Henning ZIMMERMANN
Felix Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TrinamiX GmbH
Original Assignee
TrinamiX GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TrinamiX GmbH filed Critical TrinamiX GmbH
Publication of WO2025233271A1 publication Critical patent/WO2025233271A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/0252—Constructional arrangements for compensating for fluctuations caused by, e.g. temperature, or using cooling or temperature stabilization of parts of the device; Controlling the atmosphere inside a photometer; Purge systems, cleaning devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0286—Constructional arrangements for compensating for fluctuations caused by temperature, humidity or pressure, or using cooling or temperature stabilization of parts of the device; Controlling the atmosphere inside a spectrometer, e.g. vacuum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/01—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using semiconducting elements having PN junctions

Definitions

  • the invention relates to a method for continuously determining items of temperature information for at least one illumination unit and to spectrometer device for obtaining spectroscopic information on at least one object.
  • the invention further relates to a computer program and a computer-readable storage medium for performing the method.
  • Such devices and methods can, in general, be used for investigating or monitoring purposes, in particular, in the infrared (IR) spectral region, especially in the near-infrared (NIR) spectral region, and in the visible (VIS) spectral region, e.g. in a spectral region allowing to mimic a human's ability of color sight.
  • IR infrared
  • NIR near-infrared
  • VIS visible
  • Spectrometer devices are known to be efficient tools for obtaining information on the spectral properties of an object, when emitting, irradiating, reflecting and/or absorbing light. Spectrometer devices, thus, may assist in analyzing samples or other tasks in which information on the spectral properties of an object is of interest.
  • spectral information is obtained via one or more detectors and one or more wavelength-selective optical elements, such as one or more dispersive optical elements, filters such as bandpass filters, prisms, gratings, interferometers, or the like.
  • the detectors may comprise any type of light-sensitive element, such as one or more single or multiple pixel detectors, line detectors or array detectors having one- or two-dimensional arrays of pixels.
  • spectrometer devices may comprise one or more light sources.
  • tunable light sources e.g. lasers, and/or broadband emitting light sources are used, such as halogen-gas filled light bulbs and/or hot filaments.
  • other light sources such as light emitting diodes have also been proposed for the visible spectral region.
  • spectrometer devices may be influenced by temperature changes.
  • the impedance of the photodetectors such as PbS or PbSe photodetectors, may reduce significantly with rising temperatures.
  • Such temperature variances may introduce errors into the detection of light intensity and therefore may reduce the repeatability of experiments under thermally different conditions even if there are no changes in the actual illumination.
  • Some spectrometer devices may contain temperature sensors and may use these temperature sensors for determining a temperature of the spectrometer device in between measurements, but not while a spectroscopic measurement is underway.
  • US 2023/345598 A1 describes a temperature monitor and control system for a pixel array including a first driver connected to a first pixel connected to a bus by a first switch, a second driver connected to a second pixel connected to a bus by a second switch, and a control block including connection to the first and second switches.
  • the control block turns on the first switch and turns off the second switch, measures bus voltage, determines an LED forward voltage shift of the first pixel and corresponding temperature shift for the first pixel based on the determined forward voltage shift, and adjusts a driving current for first pixel based on the determined temperature shift.
  • US 2005/052648 A1 describes a spectral photometer intended for integration purposes including a measurement head equipped with illumination arrangement including at least one light source for the illumination at an angle of incidence of 45° of a measured object and located in a measurement plane, a pickup arrangement for capturing the measurement light remitted by the measured object at an angle of reflection of essentially 0° relative to the perpendicular to the measurement plane, a spectrometer arrangement including an entry aperture for the spectral splitting of the measurement light captured and fed through the entry aperture, and a photoelectric receiver arrangement exposed to the split measurement light for conversion of the individual spectral components of the measurement light into corresponding electrical signals. It further includes an electronic circuit for control of the light source and forming digital measurement values from the electrical signals produced by the photoelectric receiver arrangement.
  • the light source is constructed as a cosign beamer and located in such a way that its main radiation direction is essentially parallel to the main beam of the remitted measurement light and the mean distance of the light source from the main beam of the remitted measurement light being essentially the same as the distance of the light source from the measurement plane.
  • the light source includes a combination of two or more light emitting diodes of different spectral characteristics located in one plane and preferably positioned on a common carrier, whereby the plane is oriented essentially parallel to the measurement plane.
  • the spectrometer arrangement includes a pot-shaped spectrometer housing made of plastic with an essentially cylindrical mantle and a removable cover.
  • a concave diffraction grating is positioned coaxially to the mantle in the spectrometer housing and rests on an annular shoulder formed on the mantle and preferably shaped complementary to the diffraction grating.
  • the cover forces the diffraction grating against the annular shoulder at a predefined force by way of a compression spring.
  • the spectrometer housing is with an end opposite the cover positioned on a printed circuit plate including the entry aperture and the photoelectric receiver arrangement and fixed to the printed circuit plate by a clamping spring.
  • the pickup arrangement is directly mounted on that side of the printed circuit plate which is opposite the side of the spectrometer housing.
  • TW 1 815 724 B describes an optical analyzer including a solid-state light source emitter, a first optical receiver and a second optical receiver.
  • the solid-state light source emitter includes a light source, which includes a plurality of light-emitting elements, each of which emits light having at least one peak emission wavelength and at least one wavelength range.
  • the light emitted by the light-emitting elements forms a first light ray and a second light ray.
  • the second light ray forms a detection light ray after passing through a fluid to be tested (i.e., the portion of the second light ray that is not absorbed by the fluid to be tested when passing through the fluid to be tested forms the detection light).
  • the first optical receiver receives the first light.
  • the second optical receiver receives the detection light.
  • spectroscopy and spectroscopic devices specifically for spectroscopy in the near-infrared range.
  • thermal drifts occurring during spectral measurements can therefore not be tracked dynamically or compensated.
  • a possibility for inferring the temperature of the spectrometer device during the measurement may comprise using the temperatures before and after the spectral measurement.
  • Some spectrometer device may use information on operation parameter of the light source to determine a temperature of the spectrometer device during the spectral measurement, e.g. via forward voltage measurements.
  • these measurement schemes may only work when the light source is turned on.
  • a method for continuously determining items of temperature information for at least one illumination unit comprises at least one light source configured for generating illumination light.
  • the illumination unit further comprises at least one driving unit configured for electrically driving the light source.
  • illumination unit is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a device or a combination of devices configured for generating or providing illumination light.
  • the illumination unit may be a single device or an arbitrary set of interacting or interdependent devices forming a whole, wherein, specifically, the single device or the set of interacting or interdependent devices in interaction with each other may be configured for generating or providing illumination light.
  • the at least two devices may be handled independently and/or may be coupled or connectable in order to provide a single functional unit.
  • the illumination may comprise at least one component or element configured for generating illumination light and at least one component or element configured for controlling the generation of illumination light.
  • the term ’’item of temperature information is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to at least one item of information indicative of a temperature of an element or device, specifically of the illumination unit.
  • the temperature of the illumination unit may be directly or indirectly derived from the item of temperature information.
  • the item of temperature information may comprises, specifically may be, a temperature.
  • the item of temperature information may comprise at least one item of information on a temperature at a given spot in the illumination unit, e.g. at the light source, which may be used as a proxy for a temperature of the entire illumination unit.
  • determining item of temperature information is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a quantitative or qualitative determination of at least one item of temperature information of an element or device, specifically of the illumination unit.
  • the determining of items of temperature information may comprise at least one process of generating at least one representative result on the temperature of the illumination unit, specifically by evaluating at least one signal on an electrically measurable quantity, specifically a forward voltage, as will be outlined in further detail below.
  • the result of the determination of items of temperature information may comprise at least one item of information which can be used to derive the temperature of the illumination unit or may comprise directly the temperature of the illumination unit.
  • continuously is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a process being performed repeatedly for given time intervals and/or events.
  • a process being performed continuously may comprise performing the process at least one within a given time interval or at least once within occurrence of a given event.
  • continuously determining the items of temperature information may comprise determining at least one item of temperature information at least once for a given on-phase and at least one item of temperature information at least once for a given off-phase of a modulation driving scheme of the light source.
  • the items of temperature information may be determined in a timely regular fashion, such as at least once within a given time interval, e.g. in accordance with a modulation frequency of the modulation driving scheme at the light source.
  • the method may provide continuous determination of items of temperature information for on-phases and off- phases of the light source for which known methods of determining temperature information of light sourced may be technically not applicable.
  • the term “light” as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to electromagnetic radiation in one or more of the infrared, the visible and the ultraviolet spectral range.
  • the term “ultraviolet spectral range” generally, refers to electromagnetic radiation having a wavelength of 1 nm to 380 nm, preferably of 100 nm to 380 nm.
  • the term “infrared spectral range” (IR) generally refers to electromagnetic radiation of 760 nm to 1000 pm, wherein the range of 760 nm to 1.5 pm is usually denominated as “near infrared spectral range” (NIR) while the range from 1 .5 pm to 15 pm is denoted as “mid infrared spectral range” (MidlR) and the range from 15 pm to 1000 pm as “far infrared spectral range” (FIR).
  • the term “light source” as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to an arbitrary device configured for generating or providing light in the sense of the above-mentioned definition.
  • the light source specifically may be or may comprise at least one electrical light source, such as an electrically driven light source.
  • generating light is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a process of emitting light in the sense of above-mentioned definition.
  • the light source may comprise at least one light-emitting diode (LED).
  • the light source may further comprise at least one luminescent material for light-conversion of primary light generated by the light-emitting diode.
  • LED light-emitting diode
  • the term specifically may refer, without limitation, to an optoelectronic semiconductor device capable of emitting light when an electrical current flows through the device.
  • the optoelectronic semiconductor device may be configured for generating the light due to various physical processes, including one or more of spontaneous emission, induced emission, decay of metastable excited states and the like.
  • the light-emitting diode may comprise one or more of: a light-emitting diode based on spontaneous emission of light, in particular an organic light emitting diode, a light-emitting diode based on superluminescence (sLED), or a laser diode (LD).
  • a light-emitting diode based on spontaneous emission of light in particular an organic light emitting diode, a light-emitting diode based on superluminescence (sLED), or a laser diode (LD).
  • sLED superluminescence
  • LD laser diode
  • the LED may comprise at least two layers of semiconductor material, wherein light may be generated at at least one interface between the at least two layers of semiconductor material, specifically due to a recombination of positive and negative electrical charges, e.g. due to electron-hole recombination
  • the at least two layers of semiconductor material may have differing electrical properties, such as at least one of the layers being an n-doped semiconductor material and at least one of the layers being a p-doped semiconductor material.
  • the LED may comprise at least one pn-junction and/or at least one pin-set up. It shall be noted, however, that other device structures are feasible, too.
  • the at least one semiconductor material may specifically be or may comprise at least one inorganic semiconducting material. It shall be noted, however, that organic semiconducting materials may be used additionally or alternatively.
  • the LED may convert electrical current into light, specifically into the primary light, more specifically into blue primary light, as will be outlined in further detail below.
  • the LED thus, specifically may be a blue LED.
  • the LED may be configured for generating the primary light, also referred to as the “pump light”.
  • the LED may also be referred to as the “pump LED”.
  • the LED specifically may comprise at least one LED chip and/or at least one LED die.
  • the semiconductor element of the LED may comprise an LED bare chip.
  • LEDs suitable for generating the primary light are known to the skilled person and may also be applied in the present invention.
  • p-n-diodes may be used.
  • one or more LEDs selected from the group of an LED on the basis of indium gallium nitride (InGaN), an LED on the basis of GaN, an LED on the basis of InGaN/GaN alloys or combinations thereof and/or other LEDs may be used.
  • quantum well LEDs may also be used, such as one or more quantum well LEDs on the basis of InGaN.
  • Superluminescence LEDs (sLED) and/or Quantum cascade lasers may be used.
  • primary light also referred to as “pump light”
  • secondary light such as by using light conversion, e.g. through one or more phosphor materials.
  • the illumination light may be or may comprise at least one of the primary light or a part thereof, the secondary light or a part thereof, or a mixture of both.
  • luminescence is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to the process of spontaneous emission of light by a substance not resulting from heat.
  • luminescence may refer to a cold-body radiation. More specifically, the luminescence may be initiated or excited by irradiation of light, in which case the luminescence is also referred to as “photoluminescence”.
  • the property of a material being capable of performing luminescence, in the context of the present invention, is referred to by the adjective “luminescent”.
  • the at least one luminescent material specifically may be a photoluminescent material, i.e. a material which is capable of emitting light after absorption of photons or excitation light.
  • the luminescent material may have a positive Stokes shift, which generally may refer to the fact that the secondary light is red-shifted with respect to the primary light.
  • the at least one luminescent material may form at least one converter, also referred to as a light converter, transforming primary light into secondary light having different spectral properties as compared to the primary light.
  • a spectral width of the secondary light may be larger than a spectral width of the primary light, and/or a center of emission of the secondary light may be shifted, specifically red-shifted, compared to the primary light.
  • the at least one luminescent material may have an absorption in the ultraviolet and/or blue spectral range and an emission in the near-infrared and/or infrared spectral range.
  • the luminescent material or converter may form at least one component of the phosphor LED converging primary light or pump light, specifically in the blue spectral range, into light having a longer wavelength, e.g. in the near-infrared or infrared spectral range.
  • the conversion can occur via a dipole-allowed transition in the luminescent material, also referred to as fluorescence, and/or via a dipole-forbidden, thus long-lived, transition in the luminescent material, often also referred to as phosphorescence.
  • the luminescent material may, thus, form at least one converter or light converter.
  • the luminescent material may form at least one of a converter platelet, a luminescent and specifically a fluorescent coating on the LED and phosphor coating on the LED.
  • the luminescent material may, as an example, comprise one or more of the following materials: Cerium-doped YAG (YAG:Ce 3+ , or Y 3 AI 5 0i2:Ce 3+ ); rare-earth-doped Sialons; copper- and aluminium-doped zinc sulfide (ZnS:Cu,AI).
  • the LED and the luminescent material may form a so-called “phosphor LED”. Consequently, the term “phosphor light-emitting diode” or briefly “phosphor LED”, as used herein, is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a combination of at least one light-emitting diode configured for generating primary light or pump light, and at least one luminescent material, also referred to as a “phosphor”, configured for light-conversion of the primary light generated by the light-emitting diode.
  • the phosphor LED may form a packaged LED light source, including the LED die, e.g. a blue LED emitting blue pump light, as well as the phosphor, which, as an example, fully or partially coats the LED, which is, as an example, configured for converting the primary light or blue light into light having differing spectral properties, specifically into near-infrared light.
  • the phosphor LED may be packaged in one housing or may be unpackaged.
  • the LED and the at least one luminescent material for light-conversion of the primary light generated by the light-emitting diode may specifically be housed in a common housing.
  • the LED may also be an unhoused or bare LED which may fully or partially be covered with the luminescent material, such as by disposing one or more layers of the luminescent material on the LED die.
  • the phosphor LED generally, may form an emitter or light source by itself.
  • the at least one luminescent material specifically may be located with respect to the light-emitting diode such that a heat transfer from the light-emitting diode to the luminescent material is possible. More specifically, the luminescent material may be located such that a heat transfer by one or both of thermal radiation and heat conduction is possible, more preferably by heat conduction. Thus, as an example, the luminescent material may be in thermal contact and/or in physical contact with the light-emitting diode. As an example, the luminescent material may form one or more coatings or layers in contact with or in close proximity to the light-emitting diode, such as with one or more of the semiconductor materials of the light-emitting diode. Thereby, generally, a temperature of the luminescent material and a temperature of the light-emitting diode may be coupled.
  • the at least one luminescent material specifically may form at least one layer.
  • the luminescent material e.g., at least one layer of the luminescent material, such as the phosphor
  • the luminescent material may be positioned directly on the light-emitting diode, which is also referred to as a “direct attach”, e.g. with no material in between the LED and the luminescent material or with one or more transparent materials in between, such as with one or more transparent materials, specifically transparent for the primary light, in between the LED and the luminescent material.
  • a coating of the luminescent material may be placed directly or indirectly on the LED.
  • the luminescent material may form at least one converter body, such as at least one converter disk, which may be placed on top of the LED, e.g. by adhesive attachment of the converter body to the LED. Additionally or alternatively, the luminescent material may also be placed in a remote fashion, such that the primary light from the LED has to pass an intermediate optical path before reaching the luminescent material. This placement may also be referred to as a “remote placement” or as a “remote phosphor”. Again, as an example, the luminescent material in the remote placement may form a solid body or converter body, such as a disk or converter disk.
  • the luminescent material may also be a coating.
  • an object which is transmitting light e.g. a thin glass substrate, module window, comprising and/or being made of glass or plastics, may be coated with the phosphor.
  • a reflective surface may be coated with the phosphor.
  • one or more optical elements may be placed, such as one or more of a lens, a prism, a grating, a mirror, an aperture or a combination thereof.
  • an optical system having imaging properties may be placed in between the LED and the luminescent material, in the intermediate optical path.
  • the primary light may be focused, or bundled onto the converter body.
  • to drive is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to the process of providing one or both of at least one control parameter and/or electrical power to another device. Consequently, the term “driving unit” as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to an arbitrary device or a combination of devices configured for providing one or both of at least one control parameter and/or electrical power to another device, such as, in the present case, to the at least one light source.
  • the driving unit specifically may be configured for at least one of measuring and controlling one or more electrical parameters of an electrical power provided to the light source, specifically to the at least one light-emitting diode.
  • the driving unit may be configured for providing an electrical current to the light source, e.g. to the LED, specifically for controlling an electrical current through the light source, e.g. through the LED.
  • the driving unit may be configured for adapting and measuring a voltage provided to the light source, the voltage being required for achieving a specific electrical current through the light source.
  • the driving unit may comprise a measurement unit that, specifically, may comprise one or more of: a current source, a voltage source, a current measurement device, such as an Ampere-meter, a voltage measurement device, such as a Volt-meter, a power measurement device, a thermometer.
  • the driving unit may comprise at least one current source for providing at least one predetermined current to the light source e.g. to the LED, wherein the current source specifically may be configured for adjusting or controlling a voltage applied to the light source in order to generate the predetermined current.
  • the driving unit may comprise one or more electrical components, such as integrated circuits, for driving the light source.
  • the driving unit may fully or partially be integrated into the light source or may be separated from the light source.
  • the method comprises the following steps that may be performed in the given order. However, a different order may also be possible. In particular, one, more than one or even all of the method steps may be performed once or repeatedly. Further, the method steps may be performed successively or, alternatively, one or more of the method steps may be performed in a timely overlapping fashion or even in a parallel fashion and/or in a combined fashion. The method may further comprise additional method steps that are not listed.
  • the method comprises: a) driving the light source with at least one modulation driving scheme, the modulation driving scheme comprising a plurality of alternating on-phases and off-phases, wherein, in the on-phases, the driving unit provides electrical power to the light source, wherein, in the off-phases, no electrical power is provided to the light source; b) determining at least one item of temperature information in at least two subsequent on- phases using at least one item of information on at least one electrically measurable quantity, specifically a forward voltage, applied to the light source; and c) determining at least one item of temperature information in an off-phase using at least one item of temperature information from a preceding on-phase and at least one item of temperature information from a subsequent on-phase.
  • modulation driving scheme is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a driving signal of an element or device.
  • the modulation driving scheme may comprise at least one driving signal of the light source, more specifically of an LED of the light source.
  • the modulation driving scheme may specifically comprise at least one driving signal comprising information on the process of providing one or both of at least one control parameter and/or electrical power to the light source.
  • the modulation driving scheme may comprise a periodic driving signal of the light source.
  • the modulation driving scheme may comprise a pulse width modulation scheme, wherein an essentially rectangular signal with a constant period duration is used which oscillates between two different forward voltage levels, in particular between a minimum or base level and a maximum level.
  • the light source may exhibit on-phases alternating with off-phases.
  • on-phase is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a phase in which the electrical power provided to the light source is greater than a minimum or base level.
  • the on-phase may be a phase in which the electrical power, specifically a forward voltage UF, applied to the light source is greater than a minimum or base level causing the light source to emit light, more specifically causing the LED to emit primary light.
  • the light source specifically the pump LED, may emit light, specifically primary light.
  • off-phase is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a phase in which the electrical power is at the minimum or base level, in particular has no defined value.
  • the off-phase may be a phase in which the electrical power, specifically a forward voltage UF, applied to the light source at a minimum or base level not causing the light source to emit light more specifically not causing the LED to emit primary light.
  • the light source specifically the pump LED
  • the light source may not emit light, specifically primary light, irrespective of the fact that an optional luminescence layer may generate secondary light.
  • alternating as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a property characterizing at least two events occurring in succession.
  • the alternating on-phases and off-phases of the modulation driving scheme at the light source may comprise the on-phases and off-phases occurring in succession.
  • the light source may be successively switched on and off.
  • the alternating on-phases and off-phases may comprise at least one on-phase followed by at least one off-phase followed by at least one on-phase and, optionally, so on.
  • the rate of alternating on-phases and off-phase of the modulation driving scheme may also be referred to as “modulation frequency”.
  • electrical power as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a quantity of transferred electrical energy.
  • the electrical power may be a quantity of electrical energy transferred to the light source.
  • the electrical power may be determined or may be determinable using a forward voltage UF and a forward current IF applied to the light source during driving.
  • the term “item of information on at least one electrically measurable quantity” as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to any parameter required for driving the light-emitting diode which is electrically measurable.
  • the item of information on the electrically measurable quantity may comprise at least one quantity selected from the group consisting of: a forward voltage; a supply of electrical power; a current.
  • the item of information on at least one electrically may specifically comprise a forward voltage.
  • the term “forward voltage” as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a voltage to be applied to the light source in the forward direction.
  • the light source may comprise at least one LED.
  • the forward direction may comprise a positive contact of a voltage or current source applied to a p-layer of the LED and a negative contact applied to the n-layer of the LED, in order to generate a predetermined electrical current through the LED.
  • the predetermined current defining the forward voltage may be a current which is known to generate a predetermined light output of the light source and/or of the light-emitting diode.
  • the predetermined current specifically may be in the range of 10 mA to 500 mA, more specifically in the range of 100 mA to 300 mA.
  • the term “forward voltage” may refer to a minimum voltage to be applied to the light source in the forward direction in order to generate a significant electrical current, specifically a predetermined electrical current defined to be a minimum electrical current, through the light source, e.g. an electrical current amounting a minimum threshold and/or above a minimum threshold.
  • the forward voltage at the LED may be a voltage, which may be derived from a diode characteristic of the LED, i.e. from a graph indicating the electrical current as a function of the voltage applied to the LED.
  • the forward voltage may be derived by a logarithmic plot of the diode characteristic of the LED, e.g. by determining a kink in the forward branch of the characteristic and/or by determining the voltage at an intersection of a straight line characterizing the steep portion of the forward branch with the horizontal axis or voltage axis.
  • the forward voltage generally may denote the voltage to be applied to the LED in forward direction (p to n) to drive an electrical current through the diode.
  • the forward voltage may depend on a bandgap of the LED.
  • an LED having a primary emission wavelength or primary emission wavelength range, in a short wavelength range, such as in the blue spectral range, may generally require a higher forward voltage than an LED emitting light in a longer wavelength range, such as red light.
  • the forward voltage sometimes also is referred to as a “forward bias” or as a “junction voltage”.
  • the symbols UF, VF or VLED may be used.
  • a direction of the electrical current through the LED in which the current flows from a p-doped layer of the LED into an n-doped layer may be determined to be a “forward direction”.
  • the measurement unit For generating the at least one item of information on the at least one electrically measureable quantity, in particular the forward voltage, required for driving the light source, e.g. for driving the LED, with a predetermined electrical current in the forward direction, the measurement unit, e.g. as part of the driving unit, may comprise one or more measurement devices or measurement elements, such as one or more voltage measurement devices.
  • the at least one item of information on the at least one electrically measureable quantity, in particular the forward voltage may be provided by the measurement unit in the form of at least one electrical signal and/or electrical information, e.g., comprising one or both of an analogue signal and a digital signal.
  • the electrical signal comprising the at least one item of information on the at least one electrically measureable quantity, in particular the forward voltage may directly or indirectly be provided to the evaluation unit.
  • the electrical signal may be time-dependent or static.
  • the determining of the at least one item of temperature information in the subsequent on- phases in step b) may comprise using at least one calibration model, specifically at least one predetermined calibration model.
  • the calibration model may comprise a relation between the item of temperature information and the item of information on the at least one electrically measurable quantity.
  • the calibration model may be determined using at least one temperature sensor, specifically at least one of an internal temperature sensor and an external temperature sensor.
  • the item of information on the at least one electrically measurable quantity may comprise a forward voltage U f .
  • the calibration model may be given by wherein a and U o denote parameter of the calibration model and 7 ⁇ denotes a temperature.
  • the term “preceding on-phase” as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to an on-phase occurring in time and/or order immediately before a particular off-phase.
  • the preceding on- phase may comprise an on-phase preceding the off-phase in time.
  • subsequent on-phase as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to an on-phase occurring in time and/or order immediately after a particular off-phase.
  • the subsequent on-phase may comprise an on-phase following the off-phase in time.
  • the preceding on-phase and the subsequent on-phase may enclose the particular off-phase, e.g. the off-phase for which the item of temperature information is to be determined.
  • the preceding on-phase may be followed by the particular off-phase, e.g. the off-phase for which the item of temperature information is to be determined, which may be followed by the subsequent off-phase.
  • the determining of the item of temperature information in the off-phase may comprise at least one of: an interpolation using the item of temperature information from the preceding on-phase and the item of temperature information from the subsequent on-phase; an extrapolation using the item of temperature information from the preceding on-phase.
  • the determining of the item of temperature information in the off-phase may comprise using at least one temperature model.
  • the temperature model may be given by:
  • T(t) I , + (T o - Too) * exp(— t/r), wherein T denotes temperature, t denotes time, T o denotes a starting temperature and and T denote fit parameter of the temperature model.
  • the fit parameter and T may be determined using the item of temperature information from the preceding on-phase and the item of temperature information from the subsequent on-phase. Alternatively or additionally, the fit parameter and T may be determined via a common fit to all pairs of the item of temperature information from the preceding on-phase and the item of temperature information from the subsequent on- phase.
  • the item of temperature information from the preceding on-phase may specifically comprise at least one last item of temperature information from the preceding on-phase being determined by using an item of information on at least one electrically measurable quantity above a first threshold value.
  • the first threshold value comprises a fraction of 90 %, specifically of 95 %, more specifically of 99 %, of a maximum of the item of information on at least one electrically measurable quantity applied to the light source.
  • the item of information on at least one electrically measurable quantity may comprise the forward voltage.
  • the item of temperature information from the preceding on-phase may be determined using the last forward voltage value of the preceding on-phase corresponding to a forward current value of at least 90 %, specifically of 95 %, more specifically of 99 %, of a maximum forward current value at the light source. This criterion may ensure that no frames during the on/off-switching during the modulation driving scheme are selected for determine the item of temperature information.
  • the item of temperature information from the preceding on-phase may comprise at least one last item of temperature information from the preceding on-phase being determined by using an item of information on at least one electrically measurable quantity and at least one timing information of the modulation driving scheme.
  • the item of temperature information from the preceding on-phase may be determined using an item of information on at least one electrically measurable quantity, which according to a timing information of the modulation driving scheme, is associated with the preceding on-phase.
  • the item of temperature information from the subsequent on-phase may comprise at least one first item of temperature information from the subsequent on-phase being determined by using an item of information on at least one electrically measurable quantity above a second threshold value.
  • the second threshold value may comprise a fraction of 90 %, specifically of 95 %, more specifically of 99 %, of a maximum of the item of information on at least one electrically measurable quantity applied to the light source.
  • the item of information on at least one electrically measurable quantity may comprise the forward voltage.
  • the item of temperature information from the subsequent on-phase may be determined using the first forward voltage value of the subsequent on-phase corresponding to a forward current value of at least 90 %, specifically of 95 %, more specifically of 99 %, of a maximum forward current value at the light source. This criterion may ensure that no frames during the on/off-switching during the modulation driving scheme are selected for determine the item of temperature information.
  • the item of temperature information from the subsequent on-phase may comprise at least one first item of temperature information from the subsequent on-phase being determined by using an item of information on at least one electrically measurable quantity and at least one timing information of the modulation driving scheme.
  • the item of temperature information from the subsequent on-phase may be determined using an item of information on at least one electrically measurable quantity, which according to a timing information of the modulation driving scheme, is associated with the subsequent on-phase.
  • the method may comprises continuously determining the item of information on at least one electrically measurable quantity during the on-phases using at least one measurement unit.
  • Step c) may comprise determining at least one item of temperature information in each off- phase using at least one item of temperature information from a preceding on-phase and at least one item of temperature information from a subsequent on-phase.
  • the continuous determination of items of temperature information may comprise determining at least one item of temperature information for each on-phase and each off-phase.
  • the method may specifically be computer-controlled.
  • the term “computer-controlled” as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to a method involving at least one computer and/or at least one computer network.
  • the computer and/or computer network may comprise at least one processor which is configured for performing and/or controlling performing at least one of the method steps a) to c). Specifically, each of the method steps a) to c) may be performed and/or controlled by the computer and/or computer network.
  • the computer-controlled method may be performed completely automatically, specifically without user interaction.
  • a spectrometer device for obtaining spectroscopic information on at least one object is disclosed.
  • spectrometer device as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to an optical device configured for acquiring at least one item of spectral information on at least one object.
  • the at least one item of spectral information may refer to at least one optical property or optically measurable property which is determined as a function of a wavelength, for one or more different wavelengths.
  • the optical property or optically measurable property, as well as the at least one item of spectral information may relate to at least one property characterizing at least one of a transmission, an absorption, a reflection and an emission of the at least one object, either by itself or after illumination with external light.
  • the at least one optical property may be determined for one or more wavelengths.
  • the spectrometer device specifically may form an apparatus which is capable of recording a signal intensity with respect to the corresponding wavelength of a spectrum or a partition thereof, such as a wavelength interval, wherein the signal intensity may, specifically, be provided as an electrical signal which may be used for further evaluation.
  • the spectrometer device may be or may comprise a device which allows for a measurement of at least one spectrum, e.g. for the measurement of a spectral flux, specifically as a function of a wavelength or detection wavelength.
  • the spectrum may be acquired, as an example, in absolute units or in relative units, e.g. in relation to at least one reference measurement.
  • the acquisition of the at least one spectrum specifically may be performed either for a measurement of the spectral flux (unit W/nm) or for a measurement of a spectrum relative to at least one reference material (unit 1 ), which may describe the property of a material, e.g., reflectance over wavelength.
  • the reference measurement may be based on a reference light source, an optical reference path, a calculated reference signal, e.g. a calculated reference signal from literature, and/or on a reference device.
  • the at least one spectrometer device may be a diffusive reflective spectrometer device configured for acquiring spectral information from the light which is diffusively reflected by the at least one object, e.g. the at least one sample.
  • the at least one spectrometer device may be or may comprise an absorption- and/or transmission spectrometer.
  • measuring the spectrum with the spectrometer device may comprise measuring absorption in a transmission configuration.
  • the spectrometer device may be configured for measuring absorption in a transmission configuration. As outlined above, however, other types of spectrometer devices are also feasible.
  • the at least one spectrometer device may comprise at least one light source, in particular at least one illumination unit, which, as an example, may be at least one of a tunable light source, a light source having at least one fixed emission wavelength and a broadband light source.
  • the spectrometer device further comprises at least one detector device configured for detecting light, such as light which is at least one of transmitted, reflected or emitted from the at least one object.
  • the spectrometer device further may comprise at least one wavelength-selective element, such as at least one of a grating, a prism and a filter, e.g. a length variable filter having varying transmission properties over its lateral extension.
  • the wavelength-selective element may be used for separating incident light into a spectrum of constituent wavelength signals whose respective intensities are determined by employing a detector such as a detector having a detector array as described below in more detail.
  • the spectrometer device may be a portable spectrometer device.
  • portable as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to the property of at least one object of being moved by human force, such as by a single user.
  • the object characterized by the term “portable” may have a weight not exceeding 10 kg, specifically not exceeding 5 kg, more specifically not exceeding 1 kg or even not exceeding 500 g.
  • the dimensions of the object characterized by the term “portable” may be such that the object extends by no more than 0.3 m into any dimension, specifically by no more than 0.2 m into any dimension.
  • the object specifically, may have a volume of no more than 0.03 m 3 , specifically of no more than 0.01 m 3 , more specifically no more than 0.001 m 3 or even no more than 500 mm 3 .
  • the portable spectrometer device may have dimensions of e.g.
  • the portable spectrometer device may be part of a mobile device or may be attachable to a mobile device, such as a notebook computer, a tablet, a cell phone, such as a smart phone, a smartwatch and/or a wearable computer, also referred to as “wearable”, e.g. a body borne computer such as a wrist band or a watch.
  • a weight of the spectrometer device specifically the portable spectrometer device, may be in the range from 1 g to 100 g, more specifically in the range from 1 g to 10 g.
  • spectroscopic information also referred to as “spectral information” or as “an item of spectral information”, as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to an item of information, e.g. on at least one object and/or radiation emitted by at least one object, characterizing at least one optical property of the object, more specifically at least one item of information characterizing, e.g. qualifying and/or quantifying, at least one of a transmission, an absorption, a reflection and an emission of the at least one object.
  • the at least one item of spectral information may comprise at least one intensity information, e.g. information on an intensity of light being at least one of transmitted, absorbed, reflected or emitted by the object, e.g. as a function of a wavelength or wavelength sub-range over one or more wavelengths, e.g. over a range of wavelengths.
  • the intensity information may correspond to or be derived from the signal intensity, specifically the electrical signal, recorded by the spectrometer device with respect to a wavelength or a range of wavelengths of the spectrum.
  • the spectrometer device specifically may be configured for acquiring at least one spectrum or at least a part of a spectrum of detection light propagating from the object to the spectrometer.
  • the spectrum may describe the radiometric unit of spectral flux, e.g. given in units of watt per nanometer (W/nm), or other units, e.g. as a function of the wavelength of the detection light.
  • W/nm watt per nanometer
  • the spectrum may describe the optical power of light, e.g. in the NIR spectral range, in a specific wavelength band.
  • the spectrum may contain one or more optical variables as a function of the wavelength, e.g. the power spectral density, electric signals derived by optical measurements and the like.
  • the spectrum may indicate, as an example, the power spectral density and/or the spectral flux of the object, e.g. of a sample, e.g. relative to a reference sample, such as a transmittance and/or a reflectance of the object, specifically of the sample.
  • the spectrum may comprise at least one measurable optical variable or property of the detection light and/or of the object, specifically as a function of the illumination light and/or the detection light.
  • the at least one measurable optical variable or property may comprise at least one at least one radiometric quantity, such as at least one of a spectral density, a power spectral density, a spectral flux, a radiant flux, a radiant intensity, a spectral radiant intensity, an irradiance, a spectral irradiance.
  • the spectrometer device may measure the irradiance in Watt per square meter (W/m 2 ), more specifically the spectral irradiance in Watt per square meter per nanometer (W/m 2 /nm). Based on the measured quantity the spectral flux in Watt per nanometer (W/nm) and/or the radiant flux in Watt (W) may be determined, e.g. calculated, by taking into account an area of the detector.
  • the term “object” as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to an arbitrary body, chosen from a living object and a non-living object.
  • the at least one object may comprise one or more articles and/or one or more parts of an article, wherein the at least one article or the at least one part thereof may comprise at least one component which may provide a spectrum suitable for investigations.
  • the object may be or may comprise one or more living beings and/or one or more parts thereof, such as one or more body parts of a human being, e.g. a user, and/or an animal.
  • the object specifically may comprise at least one sample which may fully or partially be analyzed by spectroscopic methods.
  • the object may be or may comprise at least one of: human or animal skin; edibles, such as fruits; plastics and textile.
  • the spectrometer device comprises: at least one illumination unit, wherein the illumination unit comprises at least one light source configured for generating illumination light, wherein the illumination unit further comprises at least one driving unit configured for electrically driving the light source, wherein the illumination unit is configured for illuminating the object with the illumination light; at least one detector for detecting detection light from the object; and at least one evaluation unit for evaluating at least one detector signal generated by the detector; wherein the spectrometer device is configured for performing the method according to the present invention, such as according to any one of the embodiments above and/or according to any one of the embodiments disclosed in further detail below.
  • the detection light may comprise at least one of illumination light reflected by the object, illumination light scattered by the object, illumination light transmitted by the object, luminescence light generated by the object, e.g. phosphorescence or fluorescence light generated by the object after optical, electrical or acoustic excitation of the object by the illumination light or the like.
  • the detection light may directly or indirectly be generated through the illumination of the object by the illumination light.
  • the verb “to detect” as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to the process of at least one of determining, measuring and monitoring at least one parameter, qualitatively and/or quantitatively, such as at least one of a physical parameter, a chemical parameter and a biological parameter.
  • the physical parameter may be or may comprise an electrical parameter. Consequently, the term “detector” as used herein is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to an arbitrary device configured for detecting, i.e. for at least one of determining, measuring and monitoring, at least one parameter, qualitatively and/or quantitatively, such as at least one of a physical parameter, a chemical parameter and a biological parameter.
  • the detector may be configured for generating at least one detector signal, more specifically at least one electrical detector signal, such as an analogue and/or a digital detector signal, the detector signal providing information on the at least one parameter measured by the detector.
  • the detector signal may directly or indirectly be provided by the detector to the evaluation unit, such that the detector and the evaluation unit may be directly or indirectly connected.
  • the detector signal may be used as a “raw” detector signal and/or may be processed or preprocessed before further used, e.g. by filtering and the like.
  • the detector may comprise at least one processing device and/or at least one preprocessing device, such as at least one of an amplifier, an analogue/digital converter, an electrical filter and a Fourier transformation.
  • the detector is configured for detecting light propagating from the object to the spectrometer device or more specifically to the detector of the spectrometer device, which, according to the above-mentioned nomenclature, is referred to as “detection light”.
  • the detector may be or may comprise at least one optical detector.
  • the optical detector may be configured for determining at least one optical parameter, such as an intensity and/or a power of light by which at least one sensitive area of the detector is irradiated.
  • the optical detector may comprise at least one photosensitive element and/or at least one optical sensor, such as at least one of a photodiode, a photocell, a photosensitive resistor, a phototransistor, a thermophile sensor, a photoacoustic sensor, a pyroelectric sensor, a photomultiplier and a bolometer.
  • the detector thus, may be configured for generating at least one detector signal, more specifically at least one electrical detector signal, in the above-mentioned sense, providing information on at least one optical parameter, such as the power and/or intensity of light by which the detector or a sensitive area of the detector is illuminated.
  • the detector may comprise one single optically sensitive element or area or a plurality of optically sensitive elements or areas.
  • the detector may be or may comprise at least one detector array, more specifically an array of photosensitive elements, as will be outlined in further detail below.
  • Each of the photosensitive elements may comprise at least a photosensitive area which may be adapted for generating an electrical signal depending on the intensity of the incident light, wherein the electrical signal may, in particular, be provided to the evaluation unit, as will be outlined in further detail below.
  • the photosensitive area as comprised by each of the optically sensitive elements may, especially, be a single, uniform photosensitive area which is configured for receiving the incident light which impinges on the individual optically sensitive elements.
  • the array of optically sensitive elements may be designed to generate detector signals, preferably electronic signals, associated with the intensity of the incident light which impinges on the individual optically sensitive elements.
  • the detector signal may be an analogue and/or a digital signal.
  • the electronic signals for adjacent pixelated sensors can, accordingly, be generated simultaneously or else in a temporally successive manner.
  • the individual optically sensitive elements may, preferably, be active pixel sensors which may be adapted to amplify the electronic signals prior to providing it to the evaluation unit.
  • the detector may comprise one or more signal processing devices, such as one or more filters and/or analogue-digital-converters for processing and/or preprocessing the electronic signals.
  • the detector comprises an array of optically sensitive elements
  • the detector may be selected from any known pixel sensor, in particular, from a pixelated organic camera element, preferably, a pixelated organic camera chip, or from a pixelated inorganic camera element, preferably, a pixelated inorganic camera chip, more preferably from a CCD chip or a CMOS chip, which are, commonly, used in various cameras nowadays.
  • the detector generally may be or comprise a photoconductor, in particular an inorganic photoconductor, especially PbS, PbSe, Ge, InGaAs, ext. InGaAs, InSb, or HgCdTe.
  • a camera chip having a matrix of 1 x N pixels or of M x N pixels may be used here, wherein, as an example, M may be ⁇ 10 and N may be in the range from 1 to 50, preferably from 2 to 20, more preferred from 5 to 10.
  • a monochrome camera element preferably a monochrome camera chip, may be used, wherein the monochrome camera element may be differently selected for each optically sensitive element, especially, in accordance with the varying wavelength along the series of the optical sensors.
  • the array may be adapted to provide a plurality of the electrical signals which may be generated by the photosensitive areas of the optically sensitive elements comprised by the array.
  • the electrical signals as provided by the array of the spectrometer device may be forwarded to the evaluation unit.
  • to evaluate is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to the process of processing at least one first item of information in order to generate at least one second item of information thereby. Consequently, the term “evaluation unit”, as used herein, is a broad term and is to be given its ordinary and customary meaning to a person of ordinary skill in the art and is not to be limited to a special or customized meaning.
  • the term specifically may refer, without limitation, to an arbitrary device or a combination of devices configured to evaluate or process at least one first item of information, in order to generate at least one second item of information thereof.
  • the evaluation unit may be configured for processing at least one input signal and to generate at least one output signal thereof.
  • the at least one input signal may comprise at least one detector signal provided directly or indirectly by the at least one detector and, additionally, at least one signal directly or indirectly provided by the driving unit.
  • the evaluation unit may be or may comprise one or more integrated circuits, such as one or more application-specific integrated circuits (ASICs), and/or one or more data processing devices, such as one or more of computers, digital signal processors (DSP), field programmable gate arrays (FPGA) preferably one or more microcomputers and/or microcontrollers. Additional components may be comprised, such as one or more preprocessing devices and/or data acquisition devices, such as one or more devices for receiving and/or preprocessing of the detector signals, such as one or more AD-converters and/or one or more filters. Further, the evaluation unit may comprise one or more data storage devices. Further, the evaluation unit may comprise one or more interfaces, such as one or more wireless interfaces and/or one or more wire-bound interfaces.
  • ASICs application-specific integrated circuits
  • DSP digital signal processors
  • FPGA field programmable gate arrays
  • Additional components may be comprised, such as one or more preprocessing devices and/or data acquisition devices, such as one or more devices for receiving
  • the at least one evaluation unit may be adapted to execute at least one computer program, such as at least one computer program performing or supporting the step of generating the items of information.
  • at least one computer program such as at least one computer program performing or supporting the step of generating the items of information.
  • one or more algorithms may be implemented which, by using the at least one detector signal and, optionally, a temperature correction, as input variables, may perform a predetermined transformation for deriving the spectroscopic information on the object, such as for deriving a spectrum, optionally a corrected spectrum, and/or for deriving at least one spectroscopic information describing at least one property of the object.
  • the spectrometer device may further be configured for determining at least one temperature compensation of at least one of the light source and the detector by using the item of temperature information in the on-phase and/or the off-phases.
  • the spectrometer device may further configured determining a temperature of the spectrometer device using the method according to the present invention, such as according to any one of the embodiments disclosed above and/or according to any one of the embodiments disclosed in further detail below.
  • the evaluation unit may specifically comprise at least one data processing device, also referred to as a processor, in particular an electronic data processing device, which can be designed to generate the desired information by evaluating the detector signal and, optionally, the items of temperature information.
  • the evaluation unit may be configured for considering the items of temperature information for the evaluation.
  • the evaluation unit may use an arbitrary process for generating the required information, such as by calculation and/or using at least one stored and/or known relationship.
  • a computer program comprising instructions which, when the program is executed by the spectrometer device according to the present invention, such as according to any one of the embodiments disclosed above and/or according to any one of the embodiments disclosed in further detail below, cause the spectrometer device to perform the method according to the present invention, such as according to any one of the embodiments disclosed above and/or according to any one of the embodiments disclosed in further detail below.
  • a computer-readable storage medium specifically a non-transient computer-readable medium, comprising instructions which, when the instructions are executed by the spectrometer device according to the present invention, such as according to any one of the embodiments disclosed above and/or according to any one of the embodiments disclosed in further detail below, cause the spectrometer device to perform the method according to the present invention, such as according to any one of the embodiments disclosed above and/or according to any one of the embodiments disclosed in further detail below
  • computer-readable storage medium specifically may refer to non- transitory data storage means, such as a hardware storage medium having stored thereon computer-executable instructions.
  • the computer-readable storage medium specifically may be or may comprise a storage medium such as a random-access memory (RAM) and/or a read-only memory (ROM).
  • RAM random-access memory
  • ROM read-only memory
  • the computer-readable storage medium may be or may comprise at least one computer-readable data carrier.
  • one or more of the method steps or even all of the method steps of the method according to one or more of the embodiments disclosed herein may be performed and/or controlled by using a computer or computer network.
  • any of the method steps including provision and/or manipulation of data may be performed and/or controlled by using a computer or computer network.
  • these method steps may include any of the method steps, typically except for method steps requiring manual work, such as providing the samples and/or certain aspects of performing the actual measurements.
  • the terms “have”, “comprise” or “include” or any arbitrary grammatical variations thereof are used in a non-exclusive way. Thus, these terms may both refer to a situation in which, besides the feature introduced by these terms, no further features are present in the entity described in this context and to a situation in which one or more further features are present.
  • the expressions “A has B”, “A comprises B” and “A includes B” may both refer to a situation in which, besides B, no other element is present in A (i.e. a situation in which A solely and exclusively consists of B) and to a situation in which, besides B, one or more further elements are present in entity A, such as element C, elements C and D or even further elements.
  • the terms “at least one”, “one or more” or similar expressions indicating that a feature or element may be present once or more than once typically are used only once when introducing the respective feature or element. In most cases, when referring to the respective feature or element, the expressions “at least one” or “one or more” are not repeated, nonwithstanding the fact that the respective feature or element may be present once or more than once.
  • the terms “preferably”, “more preferably”, “particularly”, “more particularly”, “specifically”, “more specifically” or similar terms are used in conjunction with optional features, without restricting alternative possibilities.
  • features introduced by these terms are optional features and are not intended to restrict the scope of the claims in any way.
  • the invention may, as the skilled person will recognize, be performed by using alternative features.
  • features introduced by "in an embodiment of the invention” or similar expressions are intended to be optional features, without any restriction regarding alternative embodiments of the invention, without any restrictions regarding the scope of the invention and without any restriction regarding the possibility of combining the features introduced in such way with other optional or non-optional features of the invention.
  • the spectrometer device and the method according to the present invention provide a large number of advantages over known devices and methods of similar kind.
  • the method and the spectrometer device according to the present invention may allow continuously determining the temperature of the illumination unit based on the item of information on the electrically measurable quantity, e.g. based on the forward voltage readings of a driven LED, during a measurement.
  • a calibration to a certain temperature scale which may be determined from an internal or external temperature sensor, may allow for linking the item of temperature information to the actual temperature of the illumination unit.
  • the method may make new observables available that can be used for the implementation of thermal compensations on a frame level, as opposed to compensations based on an average temperature, which could be determined from pre- and/or post-measurement temperatures.
  • the method may comprise interpolation of the temperature during the off-phases.
  • a final item of temperature information of a preceding, specifically of all preceding, on-phases and a first item of temperature information of the subsequent on-phase may be selected.
  • the items of temperature information may be selected by determining the first and the last values of each on-phase at which the forward current may be at least 99% of the maximum forward current during the measurement. This criterion may ensure that no frames during the on/off-switching are selected.
  • T the time constant of the heat-flow from the light source
  • T(t) T ro + (T o - ⁇ exp(-t/r), with the same parameters T and T m . may denote the temperature at which the system would settle after infinite time without disturbance.
  • Embodiment 1 A method for continuously determining items of temperature information for at least one illumination unit, wherein the illumination unit comprises at least one light source configured for generating illumination light, wherein the illumination unit further comprises at least one driving unit configured for electrically driving the light source, wherein the method comprises: a) driving the light source with at least one modulation driving scheme, the modulation driving scheme comprising a plurality of alternating on-phases and off-phases, wherein, in the on-phases, the driving unit provides electrical power to the light source, wherein, in the off-phases, no electrical power is provided to the light source; b) determining at least one item of temperature information in at least two subsequent on-phases using at least one item of information on at least one electrically measurable quantity, specifically a forward voltage, applied to the light source; and c) determining at least one item of temperature information in an off-phase using at least one item of temperature information from a preceding on-phase and at least one item of temperature information from a subsequent on-phase.
  • Embodiment 2 The method according to the preceding embodiment, wherein the determining of the item of temperature information in the off-phase comprises at least one of: an interpolation using the item of temperature information from the preceding on-phase and the item of temperature information from the subsequent on-phase; an extrapolation using the item of temperature information from the preceding on-phase.
  • Embodiment 3 The method according to any one of the preceding embodiments, wherein the item of temperature information comprises, specifically is, a temperature.
  • Embodiment 4 The method according to the preceding embodiment, wherein the determining of the item of temperature information in the off-phase comprises using at least one temperature model.
  • Embodiment 5 The method according to the preceding embodiment, wherein the temperature model is given by:
  • T(t) I , + (T o - T ro ) * exp(— t/r), wherein T denotes temperature, t denotes time, T o denotes a starting temperature and and T denote fit parameter of the temperature model.
  • Embodiment 6 The method according to the preceding embodiment, wherein the fit parameter Too and T are determined using the item of temperature information from the preceding on-phase and the item of temperature information from the subsequent on-phase.
  • Embodiment 7 The method according to any one of the two preceding embodiments, wherein the fit parameter T ro and T are determined via a common fit to all pairs of the item of temperature information from the preceding on-phase and the item of temperature information from the subsequent on-phase.
  • Embodiment 8 The method according to any one of the preceding embodiments, wherein step c) comprises determining at least one item of temperature information in each off- phase using at least one item of temperature information from a preceding on-phase and at least one item of temperature information from a subsequent on-phase.
  • Embodiment 9 The method according to any one of the preceding embodiments, wherein the continuous determination of items of temperature information comprises determining at least one item of temperature information for each on-phase and each off-phase.
  • Embodiment 10 The method according to any one of the preceding embodiments, wherein the light source comprises at least one light-emitting diode (LED).
  • the light source comprises at least one light-emitting diode (LED).
  • Embodiment 11 The method according to the preceding embodiment, wherein the light source further comprises at least one luminescent material for light-conversion of primary light generated by the light-emitting diode.
  • Embodiment 12 The method according to any one of the preceding embodiments, wherein the item of information on the at least one electrically measurable quantity comprises at least one quantity selected from the group consisting of: a forward voltage; a supply of electrical power; a current.
  • Embodiment 13 The method according to any one of the preceding embodiments, wherein the determining of the at least one item of temperature information in the subsequent on- phases in step b) comprises using at least one calibration model, specifically at least one predetermined calibration model, the calibration model comprises a relation between the item of temperature information and the item of information on the at least one electrically measurable quantity.
  • Embodiment 14 The method according to the preceding embodiment, wherein the calibration model is determined using at least one temperature sensor, specifically at least one of an internal temperature sensor and an external temperature sensor.
  • Embodiment 15 The method according to any one of the two preceding embodiments, wherein the item of information on the at least one electrically measurable quantity comprises a forward voltage U f , wherein the calibration model is given by wherein a and U o denote parameter of the calibration model and 7 ⁇ denotes a temperature.
  • Embodiment 16 The method according to any one of the preceding embodiments, wherein the method comprises continuously determining the item of information on at least one electrically measurable quantity during the on-phases using at least one measurement unit.
  • Embodiment 17 The method according to any one of the preceding embodiments, wherein the item of temperature information from the preceding on-phase comprises at least one last item of temperature information from the preceding on-phase being determined by using an item of information on at least one electrically measurable quantity above a first threshold value.
  • Embodiment 18 The method according to the preceding embodiment, wherein the first threshold value comprises a fraction of 90 %, specifically of 95 %, more specifically of 99 %, of a maximum of the item of information on at least one electrically measurable quantity applied to the light source.
  • Embodiment 19 The method according to any one of the preceding embodiments, wherein the item of temperature information from the preceding on-phase comprises at least one last item of temperature information from the preceding on-phase being determined by using an item of information on at least one electrically measurable quantity and at least one timing information of the modulation driving scheme.
  • Embodiment 20 The method according to any one of the preceding embodiments, wherein the item of temperature information from the subsequent on-phase comprises at least one first item of temperature information from the subsequent on-phase being determined by using an item of information on at least one electrically measurable quantity above a second threshold value.
  • Embodiment 21 The method according to the preceding embodiment, wherein the second threshold value comprises a fraction of 90 %, specifically of 95 %, more specifically of 99 %, of a maximum of the item of information on at least one electrically measurable quantity applied to the light source.
  • Embodiment 22 The method according to any one of the preceding embodiments, wherein the item of temperature information from the subsequent on-phase comprises at least one first item of temperature information from the subsequent on-phase being determined by using an item of information on at least one electrically measurable quantity and at least one timing information of the modulation driving scheme.
  • Embodiment 23 The method according to any one of the preceding embodiments, wherein the preceding on-phase comprises an on-phase preceding the off-phase in time.
  • Embodiment 24 The method according to any one of the preceding embodiments, wherein the subsequent on-phase comprises an on-phase following the off-phase in time.
  • Embodiment 25 The method according to any one of the preceding embodiments, wherein the method is computer-controlled.
  • Embodiment 26 A spectrometer device for obtaining spectroscopic information on at least one object, wherein the spectrometer device comprises: at least one illumination unit, wherein the illumination unit comprises at least one light source configured for generating illumination light, wherein the illumination unit further comprises at least one driving unit configured for electrically driving the light source, wherein the illumination unit is configured for illuminating the object with the illumination light; at least one detector for detecting detection light from the object; and at least one evaluation unit for evaluating at least one detector signal generated by the detector; wherein the spectrometer device is configured for performing the method according to any one of the preceding embodiments.
  • Embodiment 27 The spectrometer device according to the preceding embodiment, wherein the spectrometer device is further configured for determining at least one temperature compensation of at least one of the light source and the detector by using the item of temperature information in the on-phase and/or the off-phases.
  • Embodiment 28 The spectrometer according to any one of the two preceding embodiments, wherein the spectrometer device is further configured determining a temperature of the spectrometer device using the method according to any one of the preceding embodiments referring to a method.
  • Embodiment 29 A computer program comprising instructions which, when the program is executed by the spectrometer device according to any one of the preceding embodiments referring to a spectrometer device, cause the spectrometer device to perform the method according to any one of the preceding embodiments referring to a method.
  • Embodiment 30 A computer-readable storage medium, specifically a non-transient computer- readable medium, comprising instructions which, when the instructions are executed by the spectrometer device according to any one of the preceding embodiments referring to a spectrometer device, cause the spectrometer device to perform the method according to any one of the preceding embodiments referring to a method.
  • Figure 1 shows an embodiment of a spectrometer device for obtaining spectroscopic information on at least one object in a schematic view
  • Figure 2A shows a flow chart of an embodiment of a method for continuously determining items of temperature information for at least one illumination unit
  • Figure 2B shows a diagram of items of temperature information.
  • Figure 1 shows an exemplary embodiment of a spectrometer device 110 for obtaining spectroscopic information on at least one object 112 in a schematic view.
  • the object 112 may be applied to at least one sample interface 113 of the spectrometer device 110.
  • the spectrometer device 110 may be a diffusive reflective spectrometer device configured for acquiring spectral information from the light which is diffusively reflected by the at least one object 112, e.g. at least one sample.
  • other spectrometer devices 110 such as absorption- and/or transmission spectrometer devices, are also feasible.
  • the spectrometer device comprises at least one illumination unit 114.
  • the illumination unit 114 comprises at least one light source 116 configured for generating illumination light 118.
  • the illumination unit 114 further comprises at least one driving unit 120 configured for electrically driving the light source 116.
  • the illumination unit 114 is configured for illuminating the object 112 with the illumination light 118.
  • the light source 116 may comprise at least one light-emitting diode (LED) 122.
  • the light source 116 may further comprise at least one luminescent material 124 for light-con- version of primary light generated by the light-emitting diode 122.
  • the LED 122 and the luminescent material 124 may form a so-called “phosphor LED”.
  • the at least one luminescent material 124 may form at least one converter, also referred to as a light converter, transforming primary light into secondary light having different spectral properties as compared to the primary light.
  • the luminescent material 124 e.g., at least one layer of the luminescent material 124, such as the phosphor, may be positioned directly on the light-emitting diode 122, which is also referred to as a “direct attach”, e.g. with no material in between the LED 122 and the luminescent material 124 or with one or more transparent materials in between, such as with one or more transparent materials, specifically transparent for the primary light, in between the 122 LED and the luminescent material 124.
  • direct attach e.g. with no material in between the LED 122 and the luminescent material 124 or with one or more transparent materials in between, such as with one or more transparent materials, specifically transparent for the primary light, in between the 122 LED and the luminescent material 124.
  • Other examples are also feasible.
  • the driving unit 120 may comprise one or more electrical components, such as integrated circuits, for driving the light source 116.
  • the driving unit 120 may fully or partially be integrated into the light source 116 or may be separated from the light source 166.
  • the driving unit 120 specifically may be configured for at least one of measuring and controlling one or more electrical parameters of an electrical power provided to the light source 116, specifically to the at least one light-emitting diode 122.
  • the driving unit 120 may be configured for providing an electrical current to the light source 116, e.g. to the LED 122, specifically for controlling an electrical current through the light source 116, e.g. through the LED 122.
  • the driving unit 120 may be configured for adapting and measuring a voltage provided to the light source 116, the voltage being required for achieving a specific electrical current through the light source 116.
  • the driving unit 120 may comprise a measurement unit that, specifically, may comprise one or more of: a current source, a voltage source, a current measurement device, such as an Ampere-meter, a voltage measurement device, such as a Volt-meter, a power measurement device, a thermometer.
  • the driving unit 120 may comprise at least one current source for providing at least one predetermined current to the light source 116 e.g. to the LED 120, wherein the current source specifically may be configured for adjusting or controlling a voltage applied to the light source 116 in order to generate the predetermined current.
  • the spectrometer device 110 further comprises at least one detector 126 for detecting detection light 128 from the object 112.
  • the detector 126 may comprise one single optically sensitive element or area or a plurality of optically sensitive elements or areas.
  • the detector 126 may be or may comprise at least one detector array, more specifically an array of photosensitive elements.
  • Each of the photosensitive elements may comprise at least a photosensitive area which may be adapted for generating an electrical signal depending on the intensity of the incident light, wherein the electrical signal may, in particular, be provided to an evaluation unit, as will be outlined in further detail below.
  • the photosensitive elements may be or may comprise a photoconductor, in particular an inorganic photoconductor, especially PbS, PbSe, Ge, InGaAs, ext. InGaAs, InSb, or HgCdTe.
  • a photoconductor in particular an inorganic photoconductor, especially PbS, PbSe, Ge, InGaAs, ext. InGaAs, InSb, or HgCdTe.
  • PbS, PbSe especially PbS, PbSe, Ge, InGaAs, ext. InGaAs, InSb, or HgCdTe.
  • Other examples are also feasible.
  • the spectrometer device 110 further may comprise at least one wave- length-selective element 130, such as at least one of a grating, a prism and a filter, e.g. a length variable filter having varying transmission properties over its lateral extension.
  • the wavelength- selective element 130 may be used for separating incident light into a spectrum of constituent wavelength signals whose respective intensities are determined by employing the detector 126, such as the detector 126 having the detector array as described above.
  • the wavelength-selective element 130 as an example, may arranged in the beam path of the detection light 128. However, other arrangements are also possible.
  • the spectrometer device 110 further comprises at least one evaluation unit 132 for evaluating at least one detector signal generated by the detector 126.
  • the evaluation unit 132 may be or may comprise one or more integrated circuits, such as one or more application-specific integrated circuits (ASICs), and/or one or more data processing devices, such as one or more of computers, digital signal processors (DSP), field programmable gate arrays (FPGA) preferably one or more microcomputers and/or microcontrollers.
  • Additional components may be comprised, such as one or more preprocessing devices and/or data acquisition devices, such as one or more devices for receiving and/or preprocessing of the detector signals, such as one or more AD-converters and/or one or more filters.
  • the evaluation unit 132 may comprise one or more data storage devices. Further, the evaluation unit 132 may comprise one or more interfaces, such as one or more wireless interfaces and/or one or more wire-bound interfaces. Thus, as shown in Figure 1 , the evaluation unit 132 may be configured, e.g. via one or more interfaces, for communicating with one or more of the detector 126 and the driving unit 120 and/or receiving data from one or more of the detector 126 and the driving unit 120, e.g. receiving the detector signal from the detector 126.
  • the spectrometer device is configured for performing the method according to the present invention, such as according to the exemplary embodiment of Figure 2A and/or according to any other embodiment disclosed herein. Thus, for a detailed description of the method, reference is made to the description of Figure 2A.
  • Figure 2A shows a flow chart of an exemplary embodiment of a method for continuously determining items of temperature information for at least one illumination unit 114.
  • An exemplary illumination unit 114 is shown in Figure 1 as a part of the spectrometer device 110. However, in principle, the illumination unit 114 to be used in the method may not necessarily be part of the spectrometer device 110 or any other optical device.
  • the illumination unit 114 comprises the at least one light source 116 configured for generating illumination light 118.
  • the illumination unit 114 further comprises the at least one driving unit 120 configured for electrically driving the light source 116.
  • the method comprises the following steps that may be performed in the given order. However, a different order may also be possible. In particular, one, more than one or even all of the method steps may be performed once or repeatedly. Further, the method steps may be performed successively or, alternatively, one or more of the method steps may be performed in a timely overlapping fashion or even in a parallel fashion and/or in a combined fashion. The method may further comprise additional method steps that are not listed.
  • the method comprises: a) (denoted by reference number 134) driving the light source 116 with at least one modulation driving scheme, the modulation driving scheme comprising a plurality of alternating on-phases and off-phases, wherein, in the on-phases, the driving unit 120 provides electrical power to the light source 116, wherein, in the off-phases, no electrical power is provided to the light source 116; b) (denoted by reference number 136) determining at least one item of temperature information in at least two subsequent on-phases using at least one item of information on at least one electrically measurable quantity, specifically a forward voltage, applied to the light source 116; and c) (denoted by reference number 138) determining at least one item of temperature information in an off-phase using at least one item of temperature information from a preceding on-phase and at least one item of temperature information from a subsequent on- phase.
  • the determining of the at least one item of temperature information in the subsequent on- phases in step b) may comprise using at least one calibration model, specifically at least one predetermined calibration model.
  • the calibration model may comprise a relation between the item of temperature information and the item of information on the at least one electrically measurable quantity.
  • the calibration model may be determined using at least one temperature sensor, specifically at least one of an internal temperature sensor and an external temperature sensor.
  • the item of information on the at least one electrically measurable quantity may comprise a forward voltage U f .
  • the calibration model may be given by wherein a and U o denote parameter of the calibration model and 7 ⁇ denotes a temperature.
  • the determining of the item of temperature information in the off-phase may comprise at least one of: an interpolation using the item of temperature information from the preceding on-phase and the item of temperature information from the subsequent on-phase; an extrapolation using the item of temperature information from the preceding on-phase.
  • the determining of the item of temperature information in the off-phase may comprise using at least one temperature model.
  • the temperature model may be given by:
  • T(t) I , + (T o - Too) * exp(— t/r), wherein T denotes temperature, t denotes time, T o denotes a starting temperature and and T denote fit parameter of the temperature model.
  • the fit parameter and T may be determined using the item of temperature information from the preceding on-phase and the item of temperature information from the subsequent on-phase.
  • the fit parameter Too and T may be determined via a common fit to all pairs of the item of temperature information from the preceding on-phase and the item of temperature information from the subsequent on- phase.
  • Figure 2B shows a diagram of items of temperature information, e.g. in this case temperature 140 in °C, as a function of a frame number 142.
  • the items of temperature information in the on-phases are denoted by reference number 144 and the item of temperature information in the off-phases are denoted by reference number 146.
  • the items of temperature information in the on-phases 144 may be determined using the forward voltage U f , as outlined above. Some values are out of line, probably due to lying in a phase of turning the light source on or off. These outliers may be discarded using the following selection criterion based on the forward current.
  • the item of temperature information from the preceding on-phase may specifically comprise at least one last item of temperature information from the preceding on-phase being determined by using an item of information on at least one electrically measurable quantity above a first threshold value.
  • the first threshold value comprises a fraction of 90 %, specifically of 95 %, more specifically of 99 %, of a maximum of the item of information on at least one electrically measurable quantity applied to the light source.
  • the item of information on at least one electrically measurable quantity may comprise the forward voltage.
  • the item of temperature information from the preceding on-phase may be determined using the last forward voltage value of the preceding on-phase corresponding to a forward current value of at least 90 %, specifically of 95 %, more specifically of 99 %, of a maximum forward current value at the light source. This criterion may ensure that no frames during the on/off-switching during the modulation driving scheme are selected for determine the item of temperature information.
  • the item of temperature information from the subsequent on-phase may comprise at least one first item of temperature information from the subsequent on-phase being determined by using an item of information on at least one electrically measurable quantity above a second threshold value.
  • the second threshold value may comprise a fraction of 90 %, specifically of 95 %, more specifically of 99 %, of a maximum of the item of information on at least one electrically measurable quantity applied to the light source.
  • the item of information on at least one electrically measurable quantity may comprise the forward voltage.
  • the item of temperature information from the subsequent on-phase may be determined using the first forward voltage value of the subsequent on-phase corresponding to a forward current value of at least 90 %, specifically of 95 %, more specifically of 99 %, of a maximum forward current value at the light source. This criterion may ensure that no frames during the on/off-switching during the modulation driving scheme are selected for determine the item of temperature information.
  • the selected items of temperature information from a preceding on-phase are denoted by reference number 148 and the selected items of temperature information from a subsequent on-phase are denoted by reference number 150.
  • the items of temperature information from a preceding on-phase 148 and the items of temperature information from a subsequent on- phase 150 may be used for determining the fit parameters of the temperature model, as outlined above.
  • the temperature model in particular with the item of temperature information from a preceding on-phase 148 as the starting temperature T o , may be used to determine the unperturbed thermal behavior of the light source 116, e.g. of the LED 122 (shown as a dashed black line in Figure 2B), and therefore the items of temperature information in the respective off-phase 146, e.g. to interpolate the LED 122 junction temperatures.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un procédé de détermination en continu d'éléments d'informations de température pour au moins une unité d'éclairage (114). L'unité d'éclairage (114) comprend au moins une source de lumière (116) conçue pour générer une lumière d'éclairage (118), l'unité d'éclairage (114) comprenant en outre au moins une unité d'entraînement (120) conçue pour entraîner électriquement la source de lumière (116). Le procédé comprend : a) la commande de la source de lumière (116) avec au moins un schéma de commande de modulation, le schéma de commande de modulation comprenant une pluralité de phases actives et de phases inactives alternées, l'unité de commande (120) fournissant, dans les phases actives, une alimentation électrique à la source de lumière (116), aucune alimentation électrique n'étant fournie à la source de lumière (116) dans les phases inactives ; b) la détermination d'au moins une information de température dans au moins deux phases actives consécutives (144) à l'aide d'au moins une information sur au moins une grandeur électrique mesurable appliquée à la source de lumière (116) ; et c) la détermination d'au moins une information de température dans une phase inactive (146) à l'aide d'au moins une information de température provenant d'une phase active précédente (148) et d'au moins une information de température à partir d'une phase active ultérieure (150).
PCT/EP2025/062188 2024-05-06 2025-05-05 Procédé de détermination continue d'informations de température pour unité d'éclairage Pending WO2025233271A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050052648A1 (en) 2003-07-23 2005-03-10 Beat Frick Spectral photometer and associated measuring head
US20060237636A1 (en) * 2003-06-23 2006-10-26 Advanced Optical Technologies, Llc Integrating chamber LED lighting with pulse amplitude modulation to set color and/or intensity of output
TWI815724B (zh) 2021-11-18 2023-09-11 新加坡商兆晶生物科技股份有限公司（新加坡） 光學分析系統及其光學分析儀
US20230345598A1 (en) 2020-10-09 2023-10-26 Lumileds Llc Temperature sensing for a micro-led array

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Publication number Priority date Publication date Assignee Title
US20060237636A1 (en) * 2003-06-23 2006-10-26 Advanced Optical Technologies, Llc Integrating chamber LED lighting with pulse amplitude modulation to set color and/or intensity of output
US20050052648A1 (en) 2003-07-23 2005-03-10 Beat Frick Spectral photometer and associated measuring head
US20230345598A1 (en) 2020-10-09 2023-10-26 Lumileds Llc Temperature sensing for a micro-led array
TWI815724B (zh) 2021-11-18 2023-09-11 新加坡商兆晶生物科技股份有限公司（新加坡） 光學分析系統及其光學分析儀

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