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WO2020002975A1 - Module de filtrage adaptatif - Google Patents

Module de filtrage adaptatif Download PDF

Info

Publication number
WO2020002975A1
WO2020002975A1 PCT/IB2018/054943 IB2018054943W WO2020002975A1 WO 2020002975 A1 WO2020002975 A1 WO 2020002975A1 IB 2018054943 W IB2018054943 W IB 2018054943W WO 2020002975 A1 WO2020002975 A1 WO 2020002975A1
Authority
WO
WIPO (PCT)
Prior art keywords
filtering apparatus
filters
filtering
module
adaptive filtering
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.)
Ceased
Application number
PCT/IB2018/054943
Other languages
English (en)
Inventor
Annemarie Ingrid HOLLECZEK
André ANTUNES DE CARVALHO ALBUQUERQUE
Alexandre Manuel RIBEIRO CORREIA
Pedro Manuel DE LIMA GOMES CALDELAS
Timo Knecht
Nico Heussner
Eduardo Jorge NUNES PEREIRA
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.)
Bosch Car Multimedia Portugal SA
Original Assignee
Bosch Car Multimedia Portugal SA
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 Bosch Car Multimedia Portugal SA filed Critical Bosch Car Multimedia Portugal SA
Publication of WO2020002975A1 publication Critical patent/WO2020002975A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
    • G01J1/0444—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using means for replacing an element by another, e.g. for replacing a filter or grating
    • 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
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/497—Means for monitoring or calibrating
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels

Definitions

  • This application relates to an adaptive filtering module.
  • the noise generated by background radiation may be so high that photodetectors may saturate or the signal may be camouflaged in the noise. This makes the instrument stop doing the main function it was designed for.
  • the background radiation spans a wavelength range much wider than the emission bandwidth of the emitter, so optical filtering is a possibility to reduce out-of-band noise and, thus improve the performance of the instrument.
  • optical filters typically Band-Pass filters (BPF)
  • BPF Band-Pass filters
  • Optical filters with narrower pass-band mean that less noise generated from background radiation is added to the detected signals.
  • narrow filters also makes the system more sensitive to temperature changes.
  • the refractive index of materials not to mention coefficient of thermal expansion, nor others, the emission wavelength of laser diodes and the spectral properties of optical filters may change considerably with temperature.
  • a change of about ten degrees Celsius (°C) on common high-power laser diode emitters may shift their emitting wavelength by a few nanometers.
  • the effects of temperature on an optoelectronic system performance must be carefully addressed .
  • Document US8076958B2 discloses a signal preprocessing device which is integrated into a structure-borne sound sensor or into an acceleration sensor, for sensing structure-borne sound. Said device comprising at least one filter module having at least two BPFs . A method for operating said device is also disclosed, in which a filtering operation is carried out in which at least two frequency bands, which are at least to a certain extent part of the structure-borne sound spectrum, are transmitted.
  • Document US20030178555A1 discloses a filtering method and mechanism for scanners, including a regular visible light source and an infrared light source that are both turned on under a scanner.
  • a transmission mechanism is provided for reciprocally placing a visible light filter plate and an infrared light filter plate in the scanner light path to filter light emitting from the regular visible light and infrared light source. Changing and switching between regular and infrared light scanning is done without warm up delay of the light source.
  • an adaptive filtering module comprising:
  • a filtering apparatus to be installed in the detection unit of an optoelectronic system; said filtering apparatus comprising at least two optical filters inserted in an indexing mechanism; each filter with specific optical parameters related to Central Wavelength, Full Wide at Half Maximum, temperature variation and angle of incidence performance; and
  • control unit comprising:
  • a temperature module adapted to monitor in real time data temperature values of the filtering apparatus, of the emission unit's light source and of the photodetectors of the detection unit's optoelectronic system;
  • a database module adapted to store a list of filtering apparatus and the respective specifications related with the number of filters used, its relative positions, and their optical parameters ;
  • a processing module provided with processing means configured to correlate in real-time the information collected by the temperature module and the data stored in the database module in order to actuate the indexing mechanism of the filtering apparatus .
  • the filters of the filtering apparatus are of a band-pass filter, Long-Pass filter, Short-pass filter or Neutral Density filter type.
  • the filters of the filtering apparatus are arranged in a single row of individual filters.
  • the filters of the filtering apparatus are arranged in more than one row.
  • the rows are parallel.
  • the indexing mechanism of the filtering apparatus is of a linear type.
  • the filters of the filtering apparatus are arranged in at least one wheel.
  • the indexing mechanism of the filtering apparatus is of a rotary type.
  • the present application is related to optoelectronic systems and, more specifically, to the necessity of filtering narrow spectral bands when using single-wavelength light source (s) - emitters -, to reduce noise in optoelectronic detectors.
  • a multiple filter arrangement to minimize the effects of wavelength drift of the emitter - light source - caused by thermal oscillations.
  • a filter can be of a BPF, Long-Pass filter, Short-pass filter or Neutral Density filter type.
  • the technology now developed can be integrated in any optoelectronic system, such as a LIDAR system, and can be applied in automotive, aeronautics, robotics or other electronic assemblies.
  • the present application intends to solve the problem associated with optoelectronic systems and the thermal wavelength shifts between the emission unit and the spectral properties of the optical filters used in the detection unit, in order to have the system working uninterrupted over a wide range of temperatures and with higher signal/noise ratio.
  • FWHM Full Wide at Half Maximum wavelength
  • the proposed solution uses a set of predefined narrow filters to cover the range of working temperatures needed for the system, resulting in less undesirable photons/second arriving to the photodetector and enabling noise reduction. It is another object of the present technology to enhance objects detection/recognition, by using several narrower filters having their center wavelength (CWL) aligned with the emission unit's CWL.
  • CWL center wavelength
  • the above and other objects can be accomplished by means of a multiple filter arrangement configured to automatically select a different filter according to the temperature of operation of the optoelectronic system. Therefore, it is proposed an adaptive filtering module adapted to perform a noise temperature dependence control in optoelectronic sytems.
  • the adaptive filtering module is comprised by a filtering apparatus and a control unit.
  • the filtering apparatus comprises at least two optical filters, each with specific and predefined optical parameters related to CWL, FWHM, temperature variation and angle of incidence performance.
  • the parameter's configuration of each of the individual filters is performed at the initial stage of operation, prior to the installation of the filtering apparatus in the detection unit of the optoelectronic system, and it is dependent on the working temperature range of the system.
  • the filtering apparatus can be installed at any position along the detection unit: immediately before the receiving optics, immediately before the photodetectors or even embedded in the receiving optics.
  • the filters can be arranged in the apparatus according to several designs, such as in a single row of individual filters, in more than one row of individual filters or disposed in a single or multiple wheel mechanism. Concerning to the first design, the single row arrangement allows for no filters overlapping and therefore highest transmissions may be achieved, being also the most straightforward scenario. However space may be a problem.
  • the second and third approaches are more compact, however in a double raw design, for example, filters overlapping came into play and the total transmittance will be lower when comparing with the single row or wheel design.
  • the mentioned designs are implemented by means of a linear or rotary indexing mechanisms, which represents the physical structure where the filters are inserted, ensuring its correct shift and position according to the noise temperature control performed at the control unit.
  • the noise temperature control is achieved by automatically selecting which filter of the apparatus is to be used, according to the levels of noise allowed in the detection unit of the optoelectronic system, and the real working temperatures of the system - emission unit's light source, photodetectors and filtering apparatus - at each moment.
  • the control unit comprises temperature module, a database module and a processing module.
  • the temperature module is configured to monitor in real-time data temperature values of the emitter unit's light source, photodetectors and filtering apparatus.
  • the database module is used to store information related to working temperature ranges and respective emitting and detected wavelengths of the emitter and photodetectors. Besides that, it is used to store a list of all filtering apparatus and respective specifications, in particularly the number of filters and relative positioning to each other, as well as optical parameters - filtering characteristics - including temperature dependence.
  • the processing module is provided with processing means configured to correlate in real-time the information collected by the temperature module and the data stored in the database module, in order to perform positioning control of the filters of the filtering apparatus. In this way, it is possible to automatically handle multiple filters exchange triggered by real-time temperature readings.
  • FIG. 1 illustrates a conceptual diagram of the technology now developed, in which the reference numbers represent:
  • Figure 2 illustrate a particular embodiment of the adaptive filtering module, wherein the filtering apparatus has a single row design and is placed after the receiving optics, in which the reference numbers represent:
  • Figure 3 illustrate a particular embodiment of the adaptive filtering module, wherein the filtering apparatus has a double row design and is placed in front of the receiving optics, in which the reference numbers represent:
  • Figure 4 illustrates the filtering apparatus with a wheel design, in which the reference numbers represent:
  • the module is integrated in an optoelectronic system (1), and is comprised by a filtering apparatus (5) and a control unit
  • the filtering apparatus (5) can be integrated in the detection unit (3) in three different positions: immediately before (5.1) the receiving optics (6), immediately before (5.2) the photodetector (4), or even, eventually, embedded (5.3) in the receiving optics (6) .
  • the control unit (7) comprises a temperature module
  • the temperature module (8) is configured to monitor in real-time data temperature values of the light source of the emission unit (2), photodetectors (4) and filtering apparatus (5) .
  • the database module (9) is used to store information related to working temperature ranges and respective emitting and detected wavelengths of the emission unit (2) and photodetectors (4) . Besides that, it stores a list of all filtering apparatus (5) and respective specifications, in particularly the number of filters and relative positioning to each other, as well as filtering characteristics including temperature dependence.
  • the processing module (10) is provided with processing means adapted to correlate in real time the information collected by the temperature module (8) and the data stored in the database module (9), in order to perform positioning control of the filters of the filtering apparatus (5) .
  • the filtering apparatus (5) is placed immediately before (5.2) the photodetectors.
  • Five filters of a BPF type, (11.1) to (11.5) are assembled in a single row which has five possible stationary positions - five indexer controllable positions - corresponding to each of the five BPF to place exactly in front of the photodetectors (4) .
  • the filters are configured in the following manner,
  • the temperature module (8) is responsible for monitoring in real-time the temperature of the light source of the emission unit (2), photodetectors
  • the processing module (10) is able to perform positioning control of the filters of the filtering apparatus
  • Said control is performed actuating in a linear indexing mechanism included in the filtering apparatus (5) .
  • the filtering apparatus (5) is placed in front (5.1) of the receiving optics (6) .
  • the schematic shows the six possible positions for the filters labelled (12.1) to (12.6) in a double row design, wherein both rows are parallel. Each row has three possible stationary positions aligned with the photodetectors (4), with three indexer controllable positions for each row.
  • five BPF are used with an empty position on the central position of the back row (12.1) .
  • the filters (12.4), (12.2) and (12.3) are located by this order on the front row and the filters (12.6) and (12.5) are located, respectively, on the left and right extremities of the back row.
  • the filters are configured in the following manner,
  • the filtering apparatus (5) has a wheel design, and the positioning control of the filters (13) is performed by control unit (7) actuating in a rotary indexing mechanism included in said apparatus (5) .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Astronomy & Astrophysics (AREA)
  • Optics & Photonics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

La présente invention concerne des systèmes optoélectroniques. L'invention concerne un module de filtrage adaptatif, destiné à être inclus dans l'unité de détection d'un système optoélectronique, afin de résoudre le problème associé aux décalages de longueur d'onde thermique entre l'unité d'émission et les propriétés spectrales des filtres optiques utilisés dans l'unité de détection. Le module de filtrage adaptatif comprend un appareil de filtrage et une unité de commande, ladite unité de commande étant conçue pour effectuer une commande de dépendance à la température du bruit. À cet effet, l'appareil de filtrage comprend un ensemble de filtres optiques présentant des paramètres optiques spécifiques, automatiquement sélectionnés par l'unité de commande en fonction de mesures de température en temps réel. Grâce à cette approche, l'instrument optoélectronique peut fonctionner sans interruption sur une large plage de températures et avec un rapport signal/bruit plus élevé.
PCT/IB2018/054943 2018-06-29 2018-07-04 Module de filtrage adaptatif Ceased WO2020002975A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PT11081218 2018-06-29
PT110812 2018-06-29

Publications (1)

Publication Number Publication Date
WO2020002975A1 true WO2020002975A1 (fr) 2020-01-02

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Application Number Title Priority Date Filing Date
PCT/IB2018/054943 Ceased WO2020002975A1 (fr) 2018-06-29 2018-07-04 Module de filtrage adaptatif

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WO (1) WO2020002975A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023137565A1 (fr) * 2022-01-24 2023-07-27 Leddartech Inc. Système et procédé de gestion de spectre de signal optique, en particulier pour lidar
WO2024012711A1 (fr) * 2022-07-15 2024-01-18 Dmg Mori Additive Gmbh Procédé de surveillance de bain liquide et dispositif de fabrication additive de composants
WO2024033915A1 (fr) * 2022-08-07 2024-02-15 Ka Dynamic Color Ltd. Aspect adaptatif

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5504608A (en) * 1995-05-25 1996-04-02 At&T Corp. Adjustable filter for tuning multimode optical signals
US20010024270A1 (en) * 2000-01-05 2001-09-27 Asahi Kogaku Kogyo Kabushiki Kaisha Surveying instrument having an optical distance meter
US20030178555A1 (en) 2000-06-20 2003-09-25 Umax Data Systems Inc. Filtering method and mechanism for scanners
US20110043806A1 (en) * 2008-04-17 2011-02-24 Avishay Guetta Intrusion warning system
US8076958B2 (en) 2006-01-16 2011-12-13 Continental Teves Ag & Co. Ohg Signal preprocessing device comprising band-pass filters for structure-borne noise sensors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5504608A (en) * 1995-05-25 1996-04-02 At&T Corp. Adjustable filter for tuning multimode optical signals
US20010024270A1 (en) * 2000-01-05 2001-09-27 Asahi Kogaku Kogyo Kabushiki Kaisha Surveying instrument having an optical distance meter
US20030178555A1 (en) 2000-06-20 2003-09-25 Umax Data Systems Inc. Filtering method and mechanism for scanners
US8076958B2 (en) 2006-01-16 2011-12-13 Continental Teves Ag & Co. Ohg Signal preprocessing device comprising band-pass filters for structure-borne noise sensors
US20110043806A1 (en) * 2008-04-17 2011-02-24 Avishay Guetta Intrusion warning system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023137565A1 (fr) * 2022-01-24 2023-07-27 Leddartech Inc. Système et procédé de gestion de spectre de signal optique, en particulier pour lidar
WO2024012711A1 (fr) * 2022-07-15 2024-01-18 Dmg Mori Additive Gmbh Procédé de surveillance de bain liquide et dispositif de fabrication additive de composants
WO2024033915A1 (fr) * 2022-08-07 2024-02-15 Ka Dynamic Color Ltd. Aspect adaptatif

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