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WO2025174342A1 - Caméra de détection de co2 - Google Patents

Caméra de détection de co2

Info

Publication number
WO2025174342A1
WO2025174342A1 PCT/TR2025/050088 TR2025050088W WO2025174342A1 WO 2025174342 A1 WO2025174342 A1 WO 2025174342A1 TR 2025050088 W TR2025050088 W TR 2025050088W WO 2025174342 A1 WO2025174342 A1 WO 2025174342A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
band
filters
camera
platform
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/TR2025/050088
Other languages
English (en)
Inventor
Bektaş AKYAZI
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.)
Plan S Uydu Ve Uzay Teknolojileri AS
Original Assignee
Plan S Uydu Ve Uzay Teknolojileri AS
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 Plan S Uydu Ve Uzay Teknolojileri AS filed Critical Plan S Uydu Ve Uzay Teknolojileri AS
Publication of WO2025174342A1 publication Critical patent/WO2025174342A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/201—Filters in the form of arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N2021/1793—Remote sensing
    • G01N2021/1795—Atmospheric mapping of gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
    • G01N2021/3148—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using three or more wavelengths
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G01N2021/3531—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis without instrumental source, i.e. radiometric
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/02—Mechanical
    • G01N2201/021—Special mounting in general
    • G01N2201/0214—Airborne

Definitions

  • the present invention relates to a camera that enables monitoring the amount of carbon dioxide gas and a detection system comprising the camera, developed for use with low earth orbit (LEO) satellites, unmanned aerial vehicles or similar platforms.
  • LEO low earth orbit
  • Global warming can be defined as the decrease in the Earth's ability to reflect the sun's rays and the gradual warming of the Earth as a result of the increase in the amount of greenhouse gases (e.g. carbon dioxide, methane, etc.) in the atmosphere.
  • greenhouse gases e.g. carbon dioxide, methane, etc.
  • CO2 carbon dioxide
  • 002 gas accounts for approximately 80% of total greenhouse gas emissions. To better understand the carbon cycle, there is a need to measure atmospheric 002 concentration in space. In this context, applications for the detection and monitoring of greenhouse gases are gaining importance.
  • the world's leading space agencies have been conducting missions for many years to monitor the source and amount of 002 and other greenhouse gases.
  • the most prominent of these missions is NASA's OCO-2 (Orbiting Carbon Observatory) mission, which monitors the distribution of greenhouse gases in the atmosphere using a spectrometer-based camera as part of ESA's Copernicus program.
  • the camera used in OCO-2 is a high-cost spectrometer short-wave infrared (SWIR) camera that separates light into wavelengths, is designed by combining many different disciplines, has complex design processes and a very long project duration.
  • SWIR Short-wave infrared
  • SWIR small IR spectrometer
  • the SWIR cameras in question are mostly used for imaging purposes such as imaging in low light conditions (sunrise and sunset), behind-the-cloud imaging, smart agriculture, mine and mineral monitoring, and disaster monitoring.
  • the object of the present invention is to develop a camera and detection system suitable for use with LEO satellites, drones and similar platforms and that enables the detection and monitoring of CO2 gas.
  • Another object of the present invention is to develop a low-cost and small-sized CO2 detection camera and system.
  • Figure 1 is a graphical representation of the infrared absorption bands of CO2 gas.
  • Figure 2 is a representation of the filters located on the light sensitive detector plane of the satellite camera according to the present invention.
  • Figure 3 is an exemplary demonstration of the process of capturing images from the ground surface, which takes place with the movement of a platform on which the satellite camera, which is the subject of the invention, is located.
  • a camera that enables the detection of CO2 gas and which is suitable for use with LEO satellites or drones and similar aircraft and is being developed in order to provide a solution to the technical problems mentioned above.
  • a CO2 detection system comprising the said camera is being developed with the invention to enable the detection of places where CO2 gas is concentrated.
  • the camera according to the invention is sensitive to light in the short-wave infrared (SWIR) wavelength range (900nm - 2500nm).
  • SWIR short-wave infrared
  • the most important feature of cameras operating in this band is that they can photograph details that the human eye and standard cameras cannot see. For example, while the human eye and standard cameras cannot capture images due to lack of light at sunset before the weather becomes completely dark, SWIR cameras can capture images in this environment.
  • FIG. 1 shows the band gaps where CO2, one of the greenhouse gases, absorbs incoming infrared light and prevents its passage.
  • the horizontal axis shows the wavelength (pm)
  • the four absorption regions (S) where CO2 gas absorbs light are shown in dark rectangular frames on the graph.
  • the camera in question takes the images in these bands and compares them with the images in other bands to obtain relative information about the CO2 density.
  • Each of the absorption regions (S) is used to determine the band gap of the filters applied to the photosensitive detector plane contained in the camera.
  • Figure 2 shows an exemplary view of the detector plane (D) of the camera according to the invention.
  • the background filter (FO) is arranged to pass the entire short-wave infrared wavelength range and provides information about the total amount of light for an imaged area.
  • Each of the first to fourth filters (F1 , F2, F3, F4) is configured to pass the wavelength range related to one of the absorption regions (S) shown in Figure 1.
  • S absorption regions
  • the filters on the detector plane (D) are positioned perpendicular to the flight direction of the platform on which the camera will be placed (preferably the LEO satellite) and preferably in the order indicated in Figure 2.
  • each of the following filters F1, F2, F3, F4 will capture the same area.
  • the imaging method specified here is a method used in satellite cameras, and an exemplary representation of the method is shown in Figure 3.
  • a section (1) of the detector plane (D) covered with only one filter is shown.
  • the direction of movement of the platform (2) and the direction of the field of view (3) as a result of the platform movement are shown by arrows.
  • the relevant filter covered section of the detector plane (1) captures the image of the surface in rows and the same process is repeated for each filter covered section with the movement of the platform.
  • Photographic data is obtained by combining the images obtained.
  • the camera developed with the present invention which is suitable for use with a platform that moves according to the surface of the earth, preferably a LEO satellite; comprises a photosensitive detector (D), at least one lens arranged to focus light from the SWIR region of the electromagnetic spectrum onto the detector (D) in question, at least one background filter (FO) that passes the 950nm - 2400nm band, at least a first filter (F1) passing the 1410nm - 1470nm band range, at least a second filter (F2) passing the 1550nm - 1630nm band range, at least a third filter (F3) passing the 1930nm - 2000nm band range and at least a fourth filter (F4) passing the 2050nm - 2100nm band range coated on the surface of the detector (D) where the light coming from the lens falls, wherein the said filters (FO, F1 , F2, F3, F4) are positioned adjacent to each other and perpendicular to the direction of movement of said platform, such that the field of view of
  • the image data obtained by the camera on a LEO satellite is transmitted to a ground station by the satellite, and the CO2 density is determined on a regional basis with the image data gathered at the ground station.
  • a CO2 detection system comprising the above-mentioned camera is also developed; which includes at least one processing unit to which the image captured by the camera is transmitted.
  • the processing unit in question is arranged to evaluate the received image data, create separate image data for each filter-covered section of the detector plane, and compare the image data of the filters (F1 , F2, F3, F4) that pass the band gap of each specific absorption region (S) with the image data of the background filter (FO) that passes the entire SWIR band, thus determining the CO2 density on a regional basis.
  • the said processing unit is preferably positioned on the platform together with the camera and ensures that the detection process is carried out on the platform.
  • CO2 density can be displayed by taking photographs of the desired regions of the world in the appropriate spectral band. In this way, it is possible to detect regions with high CO2 density.
  • the camera in question weighing up to 750 gr, approximately 10x10x10 cm in size and being less costly than the current state of the art CO2 imaging applications, can be used in LEO satellites and has features that can provide solutions to the CO2 SWIR imaging needs of unmanned aerial vehicles.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

L'invention concerne un système de détection de CO2 comprenant une caméra appropriée pour être utilisée avec une plateforme qui se déplace par rapport à la surface du sol. La caméra comporte au moins un détecteur (D) sensible à la lumière, au moins une lentille agencée pour focaliser la lumière provenant de la partie SWIR (infrarouge court) du spectre électromagnétique sur le détecteur (D), un filtre d'arrière-plan (F0) revêtu sur la surface du détecteur (D) sur lequel la lumière provenant de la lentille tombe, et quatre filtres de région d'absorption (S) (F1, F2, F3, F4).
PCT/TR2025/050088 2024-02-12 2025-02-05 Caméra de détection de co2 Pending WO2025174342A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2024/001619A TR2024001619A1 (tr) 2024-02-12 2024-02-12 Co2 tespi̇t kamerasi
TR2024/001619 2024-02-12

Publications (1)

Publication Number Publication Date
WO2025174342A1 true WO2025174342A1 (fr) 2025-08-21

Family

ID=96773378

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2025/050088 Pending WO2025174342A1 (fr) 2024-02-12 2025-02-05 Caméra de détection de co2

Country Status (2)

Country Link
TR (1) TR2024001619A1 (fr)
WO (1) WO2025174342A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013173541A1 (fr) * 2012-05-18 2013-11-21 Rebellion Photonics, Inc. Système d'imagerie spectrale infrarouge à ouverture divisée pour détection chimique
US9228897B2 (en) * 2014-05-27 2016-01-05 GHGSat Inc. Fabry-Perot interferometer based satellite detection of atmospheric trace gases
CN115541013A (zh) * 2022-09-02 2022-12-30 上海航天空间技术有限公司 一种星载高分辨率碳监测光谱仪

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013173541A1 (fr) * 2012-05-18 2013-11-21 Rebellion Photonics, Inc. Système d'imagerie spectrale infrarouge à ouverture divisée pour détection chimique
US9228897B2 (en) * 2014-05-27 2016-01-05 GHGSat Inc. Fabry-Perot interferometer based satellite detection of atmospheric trace gases
CN115541013A (zh) * 2022-09-02 2022-12-30 上海航天空间技术有限公司 一种星载高分辨率碳监测光谱仪

Also Published As

Publication number Publication date
TR2024001619A1 (tr) 2025-08-21

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