WO2022110283A1 - Procédé, appareil, dispositif et support d'enregistrement de mesure de température infrarouge - Google Patents

Procédé, appareil, dispositif et support d'enregistrement de mesure de température infrarouge Download PDF

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Publication number
WO2022110283A1
WO2022110283A1 PCT/CN2020/134228 CN2020134228W WO2022110283A1 WO 2022110283 A1 WO2022110283 A1 WO 2022110283A1 CN 2020134228 W CN2020134228 W CN 2020134228W WO 2022110283 A1 WO2022110283 A1 WO 2022110283A1
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infrared
target
temperature
imaging system
function
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PCT/CN2020/134228
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English (en)
Chinese (zh)
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李东婧
李红领
邱浩楠
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烟台艾睿光电科技有限公司
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    • 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
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • 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
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/80—Calibration

Definitions

  • the invention relates to the technical field of infrared temperature measurement, in particular to an infrared temperature measurement method, device, equipment and storage medium.
  • Infrared imaging temperature measurement technology has a wide range of applications in infrared detection, infrared remote sensing, military target measurement, industrial monitoring, forest fire prevention and other fields. Due to the complex principle of infrared temperature measurement, there are a large number of factors that affect the accuracy of temperature measurement (including lens parameters, environmental variables, distance coefficients, target emissivity, output drift of the infrared detector itself, etc.), especially in the field of long-distance temperature measurement. , it has been difficult to have a better temperature measurement application scheme and algorithm.
  • the traditional single-band calibration temperature measurement scheme is generally used, but the temperature measurement performance within 100m can only be guaranteed; and combined with Planck's radiation law, a dual-band temperature measurement method can also be used, but it needs to be equipped with Dual-band lens, and the application field is concentrated in the high-altitude measurement above 10km, the cost is high, and it is rarely used in civilian products.
  • the "calibration coefficient" or single-variable empirical formula is used to correct the long-distance attenuation, which has low applicability for applications under different ambient temperatures and different lenses, and the calibration is complicated. For forest fire prevention, fire warning, etc., wide field/distance There has been no better application solution for distance temperature measurement requirements.
  • the present invention is proposed to provide an infrared temperature measurement method, device, device and storage medium that overcome the above problems or at least partially solve the above problems.
  • An infrared temperature measurement method comprising:
  • the target imaging ratio correction is performed on the first temperature data to obtain second temperature data.
  • the obtained temperature is subjected to atmospheric attenuation correction according to environmental variables and the normalized spectral response function of the infrared imaging system to obtain the first temperature data , including:
  • the following formula is used to correct the obtained atmospheric attenuation coefficient:
  • the following formula is used to obtain the first temperature data:
  • T out1 is the first temperature data
  • e is the target emissivity
  • T m is the acquired temperature
  • T env is the ambient temperature
  • n is determined by Boltzmann's theorem of the response band.
  • the target proportion correction function is obtained, which specifically includes:
  • the established functional relationship is normalized to obtain a target proportion correction function, and the obtained target proportion correction function is pre-stored in the processor of the infrared imaging system.
  • the method before performing the target imaging ratio correction on the first temperature data according to the acquired target ratio function and the target imaging radius, the method further includes: :
  • the radius of the equal-area circle corresponding to the connected domain is obtained, and the radius of the equal-area circle is used as the imaging radius of the target.
  • the following formula is used to obtain the second temperature data:
  • the embodiment of the present invention also provides an infrared temperature measurement device, comprising:
  • the test temperature acquisition module is used to acquire the temperature actually tested by the infrared imaging system on the target;
  • an atmospheric attenuation correction module configured to perform atmospheric attenuation correction on the acquired temperature according to environmental variables and the normalized spectral response function of the infrared imaging system to obtain first temperature data
  • a correction function acquisition module configured to establish a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and to acquire a target proportion correction function
  • the imaging ratio correction module is configured to perform target imaging ratio correction on the first temperature data according to the acquired target ratio function and the imaging radius of the target to obtain second temperature data.
  • An embodiment of the present invention further provides an infrared temperature measurement device, including a processor and a memory, wherein the processor implements the above infrared temperature measurement method provided by the embodiment of the present invention when the processor executes the computer program stored in the memory.
  • Embodiments of the present invention further provide a computer-readable storage medium for storing a computer program, wherein when the computer program is executed by a processor, the above-mentioned infrared temperature measurement method provided by the embodiments of the present invention is implemented.
  • an infrared temperature measurement method includes: obtaining the temperature actually measured by the infrared imaging system on the target; The obtained temperature is corrected by atmospheric attenuation to obtain the first temperature data; the functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target is established, and the target proportion correction function is obtained; according to the obtained target proportion function and the target The imaging radius is determined, and the target imaging ratio is corrected for the first temperature data to obtain the second temperature data.
  • the above-mentioned infrared temperature measurement method provided by the present invention introduces a two-variable (atmospheric attenuation and target size) correction method, and corrects the attenuation with distance in combination with the actual environment.
  • the reliability, accuracy and universality of temperature measurement, and the non-calibration scheme is used to correct the temperature drift problem of the infrared detector.
  • the workload is greatly reduced, and the traditional single-band calibration is solved. Due to the complexity of the temperature measurement scheme, it can also monitor the high temperature target in time, and realize preventive temperature measurement and inspection functions such as forest fire prevention and fire warning.
  • the present invention also provides a corresponding device, device and computer-readable storage medium for the infrared temperature measurement method, which further makes the above method more practical, and the device, device and computer-readable storage medium have corresponding advantages.
  • FIG. 1 shows a flowchart of an infrared temperature measurement method provided by an embodiment of the present invention
  • FIG. 2 shows a schematic diagram of a point spread function provided by an embodiment of the present invention
  • FIG. 3 shows a flowchart of obtaining a target proportion correction function provided by an embodiment of the present invention
  • FIG. 4 shows a flowchart of acquiring the imaging radius of a target provided by an embodiment of the present invention
  • FIG. 5 shows a schematic structural diagram of an infrared temperature measuring device provided by an embodiment of the present invention.
  • the present invention provides an infrared temperature measurement method, as shown in Figure 1, comprising the following steps:
  • the temperature actually measured by the infrared imaging system on the target is realized through the basic temperature measurement algorithm
  • the traditional atmospheric attenuation correction scheme usually only considers the influence of the external environment, while ignoring the influence of the spectral response function of the imaging system on it. Therefore, the present invention refers to the attenuation of long-wave infrared in the low sea level atmospheric window, And import the spectral response function of the optical system to further correct the atmospheric attenuation coefficient to make it closer to practical applications;
  • the optical lens has a point spread function PSF for the point light source radiation, that is, the square distribution of the radiation generated by the point light source after passing through the optical imaging system, its demonstration diagram is shown in Figure 2. Due to the linear nature of the optical imaging system, the image of a certain point can be considered as the sum of the PSFs of each point in the image. For the infrared imaging system, except that the input radiation decays with the increase of the target distance, the output radiation of the imaging system is the result of the convolution of the input radiation and the PSF:
  • Deconvolution operations can be performed to obtain the input radiation or a correction matrix can be constructed for precise correction, etc. Because the acquisition of the point spread function is more complicated, and the convolution kernel required for accurate correction is too large, it is not conducive to engineering applications. Therefore, the present invention adopts the method of correcting the proportion of target imaging to realize the correction of temperature, which is simple and fast;
  • a two-variable (atmospheric attenuation and target size) correction method is introduced, and the attenuation with distance is corrected in combination with the actual environment, which improves the performance of medium and long-distance targets (such as 500m ⁇ 2km+) temperature measurement reliability, accuracy and universality, and the non-calibration scheme is used to correct the temperature drift problem of infrared detectors.
  • medium and long-distance targets such as 500m ⁇ 2km+
  • the non-calibration scheme is used to correct the temperature drift problem of infrared detectors.
  • step S102 performs atmospheric attenuation correction on the acquired temperature according to the environmental variables and the normalized spectral response function of the infrared imaging system to obtain the first temperature.
  • a temperature data which may specifically include the following steps:
  • Step 1 Obtain the spectral transmittance and scattering function of different atmospheric components to infrared radiation, and obtain the atmospheric attenuation coefficient of the infrared imaging system;
  • the absorption of CO 2 /H 2 O and the scattering of infrared radiation by aerosol impurities are mainly considered for long-distance long-wave infrared radiation at altitudes near the horizontal plane (less than 1 km).
  • the spectral transmittance and scattering function of different atmospheric components to infrared radiation can be obtained by using the look-up table method, and the approximate atmospheric attenuation coefficient ⁇ (x) of the response band [ ⁇ 1 , ⁇ 2 ] of the imaging system can be obtained.
  • Step 2 correcting the obtained atmospheric attenuation coefficient according to the normalized spectral response function of the infrared imaging system
  • SRF sys is the normalized spectral response function of the infrared imaging system
  • SRF Dete is the normalized spectral response function of the detector, which reflects the response of the infrared detector to different bands, which is determined by the detector design and can be Obtained by spectral test
  • Transmittance Lens is the normalized transmittance function of infrared lens to infrared radiation in different bands, which is determined by lens material and optical design, and can be obtained by testing
  • M b ⁇ is the infrared spectral radiation emittance of an ideal black body
  • the resulting atmospheric attenuation coefficient can then be corrected using the following formula:
  • ⁇ re is the modified atmospheric attenuation coefficient
  • Step 3 Perform atmospheric attenuation correction on the acquired temperature according to the corrected atmospheric attenuation coefficient to obtain first temperature data
  • the infrared radiation received by the infrared imaging system mainly includes three parts: the energy emitted by the target, the energy reflected by the target, and the energy of the atmospheric environment. According to basic infrared physics, the following formula can be used to obtain the first temperature data:
  • T out1 is the first temperature data
  • e is the target emissivity
  • T m is the acquired temperature
  • T env is the ambient temperature
  • n is determined by the Boltzmann theorem of the response band
  • E aim is the energy emitted by the target
  • E ref is the energy reflected by the target
  • E env is the energy of the atmospheric environment.
  • step S103 establishes the functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and obtains the target proportion correction function, which may be specifically Include the following steps:
  • the established functional relationship is normalized to obtain the target proportion correction function, and the obtained target proportion correction function is pre-stored in the processor of the infrared imaging system.
  • E(r) is the black body at The output energy of the center point of the infrared imaging system when the radius of the pixel occupied in the infrared imaging system is r;
  • E(r max ) is the output of the center point when the black body occupies the full screen; a and b are determined by ⁇ , E(r) and E (r max ) decides.
  • step S104 before performing step S104 to perform target imaging ratio correction on the first temperature data according to the obtained target ratio function and the imaging radius of the target, further It can include: first, select any point in the target imaging (such as a forest fire point, a point with a temperature exceeding 350°C can be selected), perform a difference operation along the row and column directions of the point, and obtain the approximate length and width of the connected domain of the point; then, according to The approximate length and width of the obtained connected domain are obtained, the radius of the equal-area circle corresponding to the connected domain is obtained, and the radius of the equal-area circle is taken as the imaging radius of the target.
  • any point in the target imaging such as a forest fire point, a point with a temperature exceeding 350°C can be selected
  • the first step is to perform a differential operation on the row direction of the target point (the matlab code is as follows):
  • Row_dif is row difference data
  • Col_dif is column difference data
  • the second step is to obtain the row/column difference data.
  • the coordinates between the maximum and minimum values are the edges with the largest change in the row and column directions of the target point, and the coordinate difference is the approximate length and width of the connected domain of the target point:
  • height and width are the approximate length and width of the obtained connected domain, respectively.
  • T out2 is the second temperature data.
  • the temperature measurement accuracy of targets with different temperatures and sizes can reach ⁇ 10°C, which is far better than the result without this correction scheme.
  • an embodiment of the present invention also provides an infrared temperature measurement device. Since the principle of solving the problem of the infrared temperature measurement device is similar to that of the aforementioned infrared temperature measurement method, the implementation of the infrared temperature measurement device can refer to the infrared temperature measurement device. The implementation of the temperature measurement method will not be repeated here.
  • the infrared temperature measurement device provided by the embodiment of the present invention, as shown in FIG. 5 , specifically includes:
  • the test temperature acquisition module 11 is used to acquire the temperature actually tested by the infrared imaging system on the target;
  • the atmospheric attenuation correction module 12 is used for performing atmospheric attenuation correction on the acquired temperature according to the environmental variables and the normalized spectral response function of the infrared imaging system to obtain the first temperature data;
  • the correction function acquisition module 13 is used to establish a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and obtain the target proportion correction function;
  • the imaging ratio correction module 14 is configured to perform target imaging ratio correction on the first temperature data according to the acquired target ratio function and the imaging radius of the target to obtain second temperature data.
  • the interaction of the above-mentioned four modules can solve the complexity of the traditional single-band calibration temperature measurement scheme, and at the same time, the temperature measurement accuracy of medium and long-distance targets can be improved. Realize the timely monitoring of high temperature targets, and realize preventive temperature measurement and inspection functions such as forest fire prevention and fire warning.
  • the embodiment of the present invention also discloses an infrared temperature measurement device, including a processor and a memory; wherein, the processor implements the infrared temperature measurement method disclosed in the foregoing embodiments when the processor executes the computer program stored in the memory.
  • the present invention also discloses a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, the infrared temperature measurement method disclosed above is implemented.
  • a software module can be placed in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other in the technical field. in any other known form of storage medium.
  • RAM random access memory
  • ROM read only memory
  • electrically programmable ROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM, or any other in the technical field. in any other known form of storage medium.
  • An infrared temperature measurement method includes: acquiring a temperature actually measured by an infrared imaging system on a target; performing atmospheric attenuation correction on the acquired temperature according to environmental variables and a normalized spectral response function of the infrared imaging system , obtain the first temperature data; establish the functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and obtain the target proportion correction function; according to the obtained target proportion function and the imaging radius of the target, the first The temperature data is subjected to target imaging ratio correction to obtain second temperature data.
  • the above infrared temperature measurement method introduces a two-variable (atmospheric attenuation and target size) correction method, and combines the actual environment to correct the attenuation with distance, which improves the reliability of temperature measurement for medium and long-distance targets (such as 500m ⁇ 2km+) in different environments
  • the non-calibration scheme is used to correct the temperature drift problem of infrared detectors. Under the premise of meeting the accuracy requirements, the workload is greatly reduced, and the traditional single-band calibration temperature measurement scheme is solved. At the same time, it can monitor the high temperature target in time, and realize the preventive temperature measurement and inspection functions such as forest fire prevention and fire warning.
  • the present invention also provides a corresponding device, device and computer-readable storage medium for the infrared temperature measurement method, which further makes the above method more practical, and the device, device and computer-readable storage medium have corresponding advantages.

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  • General Physics & Mathematics (AREA)
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Abstract

L'invention concerne un procédé, un appareil, un dispositif et un support de stockage de mesure de température infrarouge, le procédé consistant : à acquérir une température réellement mesurée par un système d'imagerie infrarouge par rapport à une cible ; en fonction de variables d'environnement et d'une fonction de réponse spectrale normalisée du système d'imagerie infrarouge, à réaliser une correction d'atténuation atmosphérique sur la température acquise afin d'obtenir des premières données de température ; à établir une relation fonctionnelle entre une énergie de sortie au niveau du centre du système d'imagerie infrarouge et le rayon d'imagerie de la cible afin d'obtenir une fonction de correction de proportion de cible ; en fonction de la fonction de proportion de cible obtenue et du rayon d'imagerie de la cible, à réaliser une correction de proportion d'imagerie de cible sur les premières données de température afin d'obtenir des secondes données de température. Grâce au procédé, il est possible de résoudre la complexité d'une solution de mesure de température étalonnée à une seule bande classique, tout en améliorant également la précision d'une mesure de température de cibles à moyenne et longue portée, et d'obtenir une surveillance opportune de cibles à haute température et d'effectuer une prévention de feux de forêt, une alerte incendie et d'autres fonctions de mesure et de test de température préventifs.
PCT/CN2020/134228 2020-11-24 2020-12-07 Procédé, appareil, dispositif et support d'enregistrement de mesure de température infrarouge WO2022110283A1 (fr)

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CN115201117A (zh) * 2022-07-11 2022-10-18 北京环境特性研究所 一种超高温材料红外偏振特性测量装置及方法
CN116839733A (zh) * 2023-02-17 2023-10-03 星图智绘(西安)数字科技有限公司 一种基于Himawari-9的变时能量阈值火情遥感监测方法
CN117367596A (zh) * 2023-06-30 2024-01-09 中国人民解放军战略支援部队航天工程大学 一种天基红外载荷地面等效成像及评估方法
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CN116758085B (zh) * 2023-08-21 2023-11-03 山东昆仲信息科技有限公司 一种气体污染红外图像视觉辅助检测方法
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CN117367588B (zh) * 2023-10-09 2024-03-29 北京航空航天大学 一种基于修正的可燃混气的最小点火能测量方法

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