A fast infrared brightness measurement system and method for small aperture targets

Abstract

The present invention discloses a fast infrared brightness measurement system and method for small-aperture targets, the system comprises an ejector interlayer with a fixed threaded small hole; the optical system adopts a cross C-Z optical path structure; the optical fiber transmission system, the ejector opening is coupled with a sapphire probe at the detector end, and the probe transfers the energy in the field of view of the internal plume of the ejector to the optical fiber; the infrared spectrometer, as the measurement unit of this project, determines parameters, performs calibration and debugging, and measures the infrared radiation intensity of the target or background, and obtains the required spectral response data after analysis by the spectrometer; the data processing system performs signal acquisition through a signal acquisition system, records the measurement results, and pre-processes the measurement results, and finally displays them on a host computer. The present invention is more convenient for understanding the working state inside the engine, evaluating its performance and reliability, and monitoring its possible faults or damage.

Description

Technical Field

[0001] The invention relates to the field of experimental testing technology, and in particular to a fast infrared brightness measurement system and a measurement method for a small-aperture target. Background Art

[0002] In many fields of infrared brightness measurement today, such as infrared thermal imaging, security monitoring, industrial detection, etc., it is necessary to measure the infrared brightness of the target. Traditional infrared brightness measurement systems often use larger devices to obtain the infrared brightness information of the target. However, these devices have certain limitations in some specific scenarios, such as micro devices, long-distance measurements, and devices that are not suitable for large aperture windows.

[0003] For high-mode tests, only certain small holes can be opened for specific test equipment for measurement. The temperature and pressure of the ejector's combustion chamber are very high, which leads to fast heat conduction of the combustion chamber wall, large nozzle size, low exhaust temperature, and jet instability, which brings great difficulties and challenges to infrared radiation measurement. Therefore, it is necessary to use infrared detectors with high sensitivity and large dynamic range, as well as reasonable calibration methods and inversion algorithms to obtain the infrared radiation brightness distribution of the ejector jet. By measuring the infrared brightness of the ejector's internal plume, it is more convenient to understand the internal working state of the engine, evaluate its performance and reliability, and monitor its possible faults or damage.

[0004] The experimental study of tail flame optical radiation characteristics is the main means to test whether the theoretical model and simulation model are accurate and reliable, which helps to deeply understand the tail flame optical radiation mechanism. Foreign countries carried out the experimental work on tail flame optical radiation characteristics earlier. In 1977, Harwell et al. used an infrared radiation thermometer to test the radiation intensity of the tail flame in a certain band. In 2011, Blunck and Core conducted narrow-band radiation measurement tests on convergent nozzles with different Reynolds numbers and different Mach numbers. The infrared thermal imager used was equipped with a narrow-band filter (4.34±0.1μm). The results showed that the equivalence ratio at the nozzle outlet had a great influence on the infrared radiation intensity. A lot of research has also been conducted abroad in the detection of infrared radiation of long-distance and high-altitude tail flames. The United States installed a large-scale infrared detector array on the DSP satellite to obtain infrared images of the tail flames of long-range ballistic missile engines to calculate the trajectory and landing point of the incoming missile. The Russian Mir space station was once equipped with a variety of infrared and infrared detection equipment to capture the radiation characteristics of the tail flames of high-altitude aircraft and obtain radiation images of the tail flames. In 2021, Simon G. Kaplan and others built a low-temperature, low-background infrared radiometer that used a light guide to measure the absolute irradiance or radiometry of a low-temperature infrared laboratory source in the wavelength range of 4 to 20 μm, and further discussed the radiometric calibration uncertainty analysis of the radiometer and its maintenance and stability issues. In 2022, Timothy Carleton and others used the large HST archive to conduct a detailed study of the diffuse ultraviolet, optical, and near-infrared background and foreground, achieving a 1% accuracy measurement of the sky surface brightness.

[0005] Experimental work on the radiation characteristics of tail flames has also been carried out in China. In 2020, He Shufang and others expanded the measurement range of spectral radiation brightness to the infrared band based on the existing spectral radiation brightness measurements in the ultraviolet, visible and near-infrared bands, and established a 2um~14m infrared spectral radiation brightness metrology benchmark device to provide technical support for infrared spectral radiation calibration in the fields of remote sensing earth observation, climate change, target identification, and material emissivity measurement. In 2022, Liu Hao and others studied two test systems and methods for vacuum ultraviolet light sources, and conducted research on the vacuum ultraviolet spectral radiation brightness test method. The test system was used to test and analyze the spectral radiation brightness of the deuterium lamp according to the direct measurement method and the comparison method, realizing the precise measurement of the radiation brightness of different wavelength channels. In the same year, Cao Yu and others used variance analysis to study whether the spectral radiation brightness of high-temperature targets in the short-wave infrared band (1300-2500nm) has a directional effect, and used the least squares method to fit the directional spectral radiation brightness of high-temperature targets, and then explored its changing rules. In 2023, in order to reduce the inconsistency of different spectral radiometers, He Sijie and others discussed the influence of spectral radiation brightness and positioning under the spectral radiation brightness optical path caused by the difference in the field of view angle that can be aimed at the area on the measurement accuracy. After establishing numerical simulations of the solar whiteboard and the halogen tungsten lamp whiteboard line, their team believed that the average radiation brightness of the field area is related to the size of the central radiation brightness angle. In the same year, in order to quickly and accurately measure the brightness, Wang Yu and others used an imaging spectrometer based on a linear gradient filter for theoretical analysis and experimental verification, and realized the rapid and accurate measurement of the brightness of the surface light source.

[0006] The above research shows that the measurement of tail flame infrared radiation characteristic parameters is of great significance. Therefore, it is necessary to carry out further research on the measurement of tail flame infrared and infrared radiation characteristic parameters.

[0007] According to the analysis of the above research status, the infrared brightness measurement of the internal plume of the ejector is an extremely important measurement method, which can be used to analyze the working status of the engine, the infrared radiation characteristics of the internal plume of the ejector, etc. At the same time, in the existing technical solutions, there is no precedent for the fast infrared brightness measurement system with small apertures, and some special optical components or algorithms are often used, such as microlens arrays, photon counters, and linear gradient filters to realize the spectrometer measurement function. These solutions can realize infrared brightness measurement under small apertures to a certain extent, but there are still some limitations. Summary of the invention

[0008] The present invention provides a fast infrared brightness measurement system and method for small-aperture targets, so as to solve the problem that infrared brightness measurement under small aperture is realized by special optical components or algorithms in the prior art, and there are limitations.

[0009] In order to solve the above technical problems, one of the purposes of the present invention is to provide a fast infrared brightness measurement system for small aperture targets, which is a fiber optic remote transmission single infrared brightness measurement system, specifically comprising:

[0010] The ejector has a fixed threaded hole in the ejector interlayer;

[0011] The optical system uses a cross CZ optical path structure, which calibrates the coma to a more ideal value, and the obtained spectral spots are more regular;

[0012] The optical fiber transmission system is coupled to the ejector opening and the sapphire probe at the detector end, which transmits the energy within the field of view of the internal plume of the ejector to the optical fiber;

[0013] The infrared spectrometer, as the measurement unit of this project, determines the measurement band, measurement distance and measurement angle parameters, and performs calibration and debugging, and measures the infrared radiation intensity of the target or background. After analysis by the spectrometer, the required spectral response data is obtained;

[0014] The data processing system collects signals through the signal acquisition system, records the measurement results, pre-processes the measurement results, and finally displays them on the host computer.

[0015] Furthermore, the measurement system also includes a synchronous trigger unit, which has a global synchronous trigger signal connected to the host computer to ensure that each system performs sampling at the same time.

[0016] Furthermore, the ejector interlayer is cooled by water cooling to prevent the ejector from being damaged indirectly due to excessive plume temperature inside the ejector.

[0017] Furthermore, a waterproof objective lens is used to collect energy from the radiation signal of the plume inside the ejector through the ejector opening window, and optical fiber transmission technology is used to separate the front-end optical probe from the rear-end optical path part and the instrument main system.

[0018] Furthermore, the radiation signal of the plume inside the ejector is transmitted through the optical fiber, and the optical fiber is used to transmit the radiation energy signal, which ensures that the measured signal is better prevented from being affected by factors such as strong vibration.

[0019] Furthermore, the ejector interlayer has a fixed threaded hole with a diameter of 6 mm.

[0020] Based on the same inventive concept, the present invention also provides a method for fast brightness measurement of a small aperture target, and the specific steps are as follows:

[0021] 1) A fixed threaded hole is opened in the interlayer of the ejector, and the hole is coupled with the sapphire probe at the detector end. The probe can transfer the energy in the field of view of the internal plume of the ejector to the optical fiber. After being analyzed by the spectrometer, the required spectral response data is obtained, which is converted into a brightness signal through a brightness conversion algorithm and displayed on the host computer;

[0022] 2) A blackbody furnace is used to calibrate the radiation brightness, and a data fitting method is used to perform curve fitting on the calibration data, thereby obtaining a continuous curve of the brightness standard corresponding to each wavelength. Through the on-site infrared brightness measurement test of the internal plume of the ejector, continuous collection and real-time output of brightness information are achieved;

[0023] 3) After the measurement process starts, the waterproof objective lens transmits the radiation energy of the ejector plume through the optical fiber entrance of the optical probe and the optical fiber to the focal plane of the collimating lens of the infrared spectrometer, thereby realizing the collection of radiation information of the target under test at different working wavelengths.

[0024] Furthermore, the S2 calibrates the infrared brightness fiber test system of the internal plume of the ejector by measuring the radiation emittance of a standard black body radiation source. The specific steps are as follows:

[0025] 1) For a black body microsurface dA, there exists

[0026]

[0027] The intercepted microelement surface ds on the hemisphere can be considered as a plane rectangle, with side lengths of rdθ and Therefore, existence

[0028]

[0029] 2) You can get

[0030]

[0031] The radiant brightness L can be expressed as:

[0032]

[0033] If the spectral radiance responsivity of the instrument is defined as R L (λ), then

[0034]

[0035] Where V(λ) is the spectral output voltage of the instrument at wavelength λ; L e (λ) is the measured spectral radiance at the entrance pupil;

[0036] 3) Measure the voltage V of the standard black body radiation source at λ s(λ) is

[0037] V s (λ)=L s (λ)R L (λ)

[0038] Where, L s (λ) is the spectral radiance of the standard blackbody radiation source;

[0039] 4) Get the voltage V by measuring the target to be tested xλ ,but

[0040] V x (λ)=L x (λ)R L (λ)

[0041] Where, L x (λ) is the spectral radiance of the target to be measured;

[0042] 5) The radiation brightness of the target to be measured is

[0043]

[0044] Furthermore, the specific steps of the S3 measurement process are as follows:

[0045] 1) After entering the measurement system, the system needs to be preheated for 60 minutes;

[0046] 2) After the preheating is completed, it will be determined whether the system uses the original calibration file. If the historical calibration file is not used, the system measurement calibration procedure will be carried out;

[0047] 3) First, aim the lens of the device at the black body target and set the initial temperature for calibration. At this time, call the measurement program to collect the calibration data;

[0048] 4) After completing the collection of all calibration data, call the calibration program, in which all calibration data need to be selected, and then multiple data fittings are performed to finally generate a calibration output file;

[0049] 5) After completing the data calibration, call the data acquisition program again to realize the brightness measurement. At this time, you need to complete the aiming of the measurement target and other operations in advance, wait for the synchronous trigger signal from the measurement control end to start data acquisition, and click to stop the acquisition when the acquisition is completed;

[0050] 6) After completing data collection, select the measurement data and the generated calibration file. The program will generate a radiance measurement curve for the measurement target. You can choose to save it as a file to complete local data storage.

[0051] The above one or more technical solutions of the present invention have at least one or more of the following technical effects:

[0052] The present invention measures objects under extreme conditions: it can measure objects with a radiation window of 6mm; it improves the measurement speed: it can measure brightness data of no less than 500 frames; it has an innovative optical path system design: it uses a monochromator and an infrared detector combined structure. This structure can achieve the measurement range and resolution by adjusting the grating structure of the front-end monochromator.

[0053] The present invention is mainly used in the scene of measuring the infrared brightness of the plume inside the ejector. By measuring the infrared brightness of the plume inside the ejector, it is more convenient to understand the working state inside the engine, evaluate its performance and reliability, and monitor its possible faults or damage, which is of great significance for optimizing design, improving efficiency and ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 :Block diagram of the fiber optic test system for infrared brightness of the internal plume of the ejector;

[0055] Figure 2 : Schematic diagram of optical structure;

[0056] Figure 3 : Measurement system software flow chart;

[0057] Figure 4 : black body microfacet;

[0058] Figure 5 : Preheating program interface diagram;

[0059] Figure 6 : Measurement program interface diagram;

[0060] Figure 7 : Measurement result interface diagram. Specific implementation plan

[0061] The present invention proposes a solution that can achieve fast and accurate brightness measurement under fixed thickness and aperture size, and is mainly used in the infrared brightness measurement scenario of the plume inside the ejector.

[0062] Combining the theoretical requirements of radiation brightness measurement and the actual needs of the project, the fiber optic test system for infrared brightness of the internal plume of the ejector is designed as a fiber optic remote transmission single infrared brightness measurement system. It consists of the following parts: optical system, fiber optic transmission system, signal acquisition system, communication conversion system and computer. The schematic diagram of the fiber optic test system for infrared brightness of the internal plume of the ejector is shown in the figure below. Figure 1 shown.

[0063] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the embodiments of the present invention and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the obtained embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0064] Figure 2 The schematic diagram of the optical structure of the fiber optic test system for infrared brightness of the internal plume of the ejector. The cross CZ optical path structure is used in the optical path design. A 6mm fixed threaded hole is opened in the ejector interlayer, which is coupled with the sapphire probe at the detector end. The probe can transfer the energy in the field of view of the internal plume of the ejector to the optical fiber. After analysis by the spectrometer, the required spectral response data is obtained, which is converted into a brightness signal through a brightness conversion algorithm and displayed on the host computer. At the same time, there is a global synchronization trigger signal connected to the computer to ensure that each system is sampled at the same time.

[0065] In order to prevent the ejector from being damaged indirectly due to the excessive temperature of the plume inside the ejector, the ejector interlayer is usually cooled by water. The test site is accompanied by high-pressure water jets. A waterproof objective lens is used to collect the energy of the radiation signal of the plume inside the ejector through the ejector opening window, and optical fiber transmission technology is used to separate the front-end optical probe from the rear-end optical path part and the main system of the instrument. The radiation signal of the plume inside the ejector is transmitted through optical fiber, and the radiation energy signal is transmitted by optical fiber. At the same time, it can ensure that strong vibration and other factors can be avoided. The influence on the measured signal. When the instrument is working, only the optical aiming system is close to the ejector, and the rest is far away from the site.

[0066] After the measurement process starts, the waterproof objective lens transmits the radiation energy of the ejector plume through the optical fiber entrance of the optical probe and through the optical fiber to the focal plane of the collimating lens of the infrared spectrometer, thereby realizing the collection of radiation information of the target under test at different working wavelengths.

[0067] Figure 3It is a flow chart of the measurement method of the present invention, and the system is written in C#. Since the lead selenide detector is greatly affected by temperature, after entering the measurement system, the system needs to be preheated, and the preheating time is 60 minutes. After the preheating is completed, it will be determined whether the system uses the original calibration file. If the historical calibration file is not used, the system measurement calibration program is performed. First, after aiming the lens of the device to the black body target, the initial temperature of the calibration is set. At this time, the measurement program is called to collect the calibrated data. After completing the collection of all calibration data, the calibration program is called. In this program, all calibration data need to be selected, and then multiple data fittings are performed to finally generate a calibration output file. After completing the data calibration, the data acquisition program is called again to realize brightness measurement. At this time, operations such as aiming the measurement target need to be completed in advance. Wait for the synchronization trigger signal of the measurement control end to start data acquisition, and click to stop acquisition when the acquisition is completed. After the data acquisition is completed, select the measurement data. After selecting the generated calibration file, the program will generate the radiation brightness measurement curve of the measurement target, which can be saved as a file to complete local data storage.

[0068] Select infrared spectrometer brightness measurement technology as the brightness measurement method of this project, and then select a suitable infrared spectrometer model as the measurement unit of this project. According to the characteristics of the internal plume of the ejector and the purpose of measurement, determine the measurement band, measurement distance, measurement angle and other parameters, and perform calibration and debugging. And measure the infrared radiation intensity of the target or background, collect signals through the signal acquisition system, record the measurement results, and pre-process the measurement results, such as filtering, correction, normalization, etc. It is planned to use a blackbody furnace for radiation brightness calibration. At the same time, the calibration data is curve-fitted using a data fitting method to obtain a continuous curve of the brightness standard corresponding to each wavelength. And through the on-site ejector internal plume infrared brightness measurement test, continuous acquisition and real-time output of brightness information is achieved.

[0069] The infrared brightness measurement involved in the present invention is essentially a method of measuring the infrared radiation brightness of a specific object using an infrared spectrometer, which can reflect the radiation characteristics of the target as well as information such as temperature, composition, and structure. The essence of infrared brightness measurement is based on Planck's radiation law and Stefan-Boltzmann's law, which describe the relationship between the infrared radiation emitted by a substance at different temperatures and its temperature.

[0070] Both the radiant brightness L and the radiant emittance M characterize the distribution characteristics of the radiant power on the surface. The radiant emittance M is the radiant power emitted per unit area into the hemispherical space, and the radiant brightness L is the radiant power emitted per unit apparent area per unit solid angle in a specific direction. Therefore, we calibrate the infrared brightness fiber optic test system of the internal plume of the ejector by measuring the radiant emittance of the standard blackbody radiation source.

[0071] like Figure 4 As shown, for a black body microfacet dA, there exists

[0072]

[0073] The intercepted microelement surface ds on the hemisphere can be considered as a plane rectangle, with side lengths of rdθ and Therefore, existence

[0074]

[0075] Therefore, we can get

[0076]

[0077] The radiant brightness L can be expressed as:

[0078]

[0079] If the spectral radiance responsivity of the instrument is defined as R L (λ), then

[0080]

[0081] Where V(λ) is the spectral output voltage of the instrument at wavelength λ; L e (λ) is the measured spectral radiance at the entrance pupil.

[0082] At this time, measure the voltage V of the standard black body radiation source at λ s (λ) is

[0083] V s (λ)=L s (λ)R L (λ)

[0084] Where, L s (λ) is the spectral radiation brightness of the standard black body radiation source. The voltage V is obtained by measuring the target to be measured. xλ ,but

[0085] V x (λ)=L x (λ)R L (λ)

[0086] Where, L x (λ) is the spectral radiation brightness of the target to be measured, so the radiation brightness of the target to be measured can be obtained as

[0087]

[0088] The present invention can be designed in different ways according to actual needs. For example, changing the grating angle and slit width of the optical component can further adjust the measurement range and measurement resolution. At the same time, the optical fiber and lens structure can be combined to adapt to different measurement window sizes. In addition, the technical solution of the present invention can also be applied to other optical measurement fields, such as visible light brightness measurement.

[0089] The present invention has been verified by repeatable measurement experiments on blackbody targets at different times. The results show that the technical solution has good feasibility and effect in small-aperture fast infrared brightness measurement under blackbody equivalent brightness conditions of (800-2500)℃.

[0090] The monochromator and infrared detector structure are used to realize the infrared spectrometer function. This structure combined with infrared lens and optical fiber can efficiently capture infrared light signals under small aperture conditions.

[0091] The following are the technical indicators that can be achieved by this system:

[0092] (1) Infrared wavelength range: (2.5~5)μm;

[0093] (2) Wavelength resolution: ≤30nm;

[0094] (3) Test rate: ≥500fps;

[0095] (4) Probe diameter: <7mm;

[0096] (5) The optical fiber lead-out length of the test system is not less than 1 meter;

[0097] (6) The front-end detection optical system (probe + optical fiber) is waterproof and has the ability to resist water flow impact;

[0098] (7) Ensure the sealing of the front-end detection optical path system itself or by developing a packaging structure;

[0099] (8) It has the function of optical sighting and focusing in a narrow space;

[0100] (9) Equipped with probes and optical fiber accessories for replacement after the front-end detection optical path is damaged.

[0101] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A fast infrared brightness measurement system for small aperture targets, which is a fiber-optic remote transmission single infrared brightness measurement system, characterized in that: Specifically include: The ejector has a fixed threaded hole in the ejector interlayer; The optical system uses a cross CZ optical path structure, which calibrates the coma to a more ideal value, and the obtained spectral spots are more regular; The optical fiber transmission system is coupled to the ejector opening and the sapphire probe at the detector end, which transmits the energy within the field of view of the internal plume of the ejector to the optical fiber; The infrared spectrometer, as the measurement unit of this project, determines the measurement band, measurement distance and measurement angle parameters, and performs calibration and debugging, and measures the infrared radiation intensity of the target or background. After analysis by the spectrometer, the required spectral response data is obtained; The data processing system collects signals through the signal acquisition system, records the measurement results, pre-processes the measurement results, and finally displays them on the host computer.

2. The fast infrared brightness measurement system for small aperture targets according to claim 1, characterized in that: The measurement system also includes a synchronous trigger unit, which has a global synchronous trigger signal connected to the host computer to ensure that each system performs sampling at the same time.

3. The fast infrared brightness measurement system for small aperture targets according to claim 1, characterized in that: The ejector interlayer is cooled by water cooling to prevent the ejector from being damaged indirectly by excessively high plume temperature inside the ejector.

4. The fast infrared brightness measurement system for small aperture targets according to claim 3, characterized in that: A waterproof objective lens is used to collect energy from the radiation signal of the plume inside the ejector through the ejector opening window, and optical fiber transmission technology is used to separate the front-end optical probe from the rear-end optical path part and the instrument main system.

5. The fast infrared brightness measurement system for small aperture targets according to claim 1, characterized in that: The radiation signal of the plume inside the ejector is transmitted through optical fiber. The use of optical fiber to transmit the radiation energy signal ensures that factors such as strong vibrations are not likely to affect the measured signal.

6. The fast infrared brightness measurement system for small aperture targets according to claim 1, characterized in that: The fixed threaded hole in the ejector interlayer is 6mm.

7. The measuring method of the fast infrared brightness measurement system of a small aperture target according to any one of claims 1 to 6, characterized in that: The specific steps are as follows: 1) A fixed threaded hole is opened in the interlayer of the ejector, and the hole is coupled with the sapphire probe at the detector end. The probe can transfer the energy in the field of view of the internal plume of the ejector to the optical fiber. After being analyzed by the spectrometer, the required spectral response data is obtained, which is converted into a brightness signal through a brightness conversion algorithm and displayed on the host computer; 2) A blackbody furnace is used to calibrate the radiation brightness, and a data fitting method is used to perform curve fitting on the calibration data, thereby obtaining a continuous curve of the brightness standard corresponding to each wavelength. Through the on-site infrared brightness measurement test of the internal plume of the ejector, continuous collection and real-time output of brightness information are achieved; 3) After the measurement process starts, the waterproof objective lens transmits the radiation energy of the ejector plume through the optical fiber entrance of the optical probe and the optical fiber to the focal plane of the collimating lens of the infrared spectrometer, thereby realizing the collection of radiation information of the target under test at different working wavelengths.

8. The method for rapid infrared brightness measurement of a small aperture target according to claim 7, characterized in that: The S2 calibrates the infrared brightness fiber test system of the internal plume of the ejector by measuring the radiation emittance of the standard black body radiation source. The specific steps are as follows: 1) For a black body microsurface dA, there exists The intercepted microelement surface ds on the hemisphere can be considered as a plane rectangle, with side lengths of rdθ and Therefore, existence 2) You can get The radiant brightness L can be expressed as: If the spectral radiance responsivity of the instrument is defined as R L (λ), then Where V(λ) is the spectral output voltage of the instrument at wavelength λ; L e (λ) is the measured spectral radiance at the entrance pupil; 3) Measure the voltage V of the standard black body radiation source at λ s (λ) is V s (λ)=L s (λ)R L (l) Where, L s (λ) is the spectral radiance of the standard blackbody radiation source; 4) Get the voltage V by measuring the target to be tested xλ ,but V x (λ)=L x (λ)R L (l) Where, L x (λ) is the spectral radiance of the target to be measured; 5) The radiation brightness of the target to be measured is 9. The method for rapid infrared brightness measurement of a small aperture target according to claim 7, characterized in that: The specific steps of the S3 measurement process are as follows: 1) After entering the measurement system, the system needs to be preheated for 60 minutes; 2) After the preheating is completed, it will be determined whether the system uses the original calibration file. If the historical calibration file is not used, the system measurement calibration procedure will be carried out; 3) First, aim the lens of the device at the black body target and set the initial temperature for calibration. At this time, call the measurement program to collect the calibration data; 4) After completing the collection of all calibration data, call the calibration program, in which all calibration data need to be selected, and then multiple data fittings are performed to finally generate a calibration output file; 5) After completing the data calibration, call the data acquisition program again to realize the brightness measurement. At this time, you need to complete the aiming of the measurement target and other operations in advance, wait for the synchronous trigger signal from the measurement control end to start data acquisition, and click to stop the acquisition when the acquisition is completed; 6) After completing data collection, select the measurement data and the generated calibration file. The program will generate a radiance measurement curve for the measurement target. You can choose to save it as a file to complete local data storage.

Images