High-temporal-spatial-resolution temperature measuring device and calibration method and application thereof

Abstract

The invention relates to a high-temporal-spatial-resolution temperature measuring device and a calibration method and application thereof, and provides a measuring device for measuring the combustion temperature of micro / nano fuel particles by coupling a single-point photoelectric colorimetric pyrometer and a high-speed image sensor, and the measuring device is applied to measurement of the combustion temperature of the micro / nano fuel particles. In order to make the detection result more accurate, a calibration method is provided, and the single-point photoelectric colorimetric pyrometer and the high-speed image sensor camera are subjected to off-line calibration and on-line calibration by using the same standard source so as to correct the influence of a coupling light path on radiation signal spectral information; after calibration, the specific wavelength radiation signal of the to-be-measured object can be accurately measured, the single-point high-temporal-resolution representation and the two-dimensional spatial distribution representation of the combustion temperature of the to-be-measured object are obtained by adopting a colorimetric temperature measurement formula, and the scientific problem of multi-dimensional high-temporal-spatial-resolution representation of the combustion temperature of the micro-nano fuel particles is effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of temperature measuring devices, and in particular relates to a temperature measuring device with high temporal and spatial resolution, a calibration method and application thereof. Background Art

[0002] With the development of engine technology, hypersonic vehicles with high Mach number and wide range requirements have received widespread attention. At high Mach numbers, liquid fuel ramjet engines have encountered bottlenecks in practical engineering applications due to the low density of liquid fuel, high dissociation, poor combustion stability and complex engine structure. Therefore, solid fuel engines have gradually become a competitive choice. Compared with liquid fuel engines, solid fuel engines have high safety and stability during manufacturing, storage and use, and have powerful flow regulation, re-ignition and adjustable thrust functions. More importantly, solid fuel has low dissociation and can maintain complete energy release even in high Mach number flight conditions.

[0003] In recent years, the application of micro / nanoscale fuels has gradually expanded to a variety of advanced propulsion technologies including ramjets, solid propellants and composite propulsion systems. The unique characteristics of micro / nano fuels give them significant advantages in improving combustion efficiency, enhancing specific impulse performance and improving system reliability. Whether it is traditional aluminum, magnesium, boron powder fuels or new composite micro / nano fuels, in-depth research on the energy release law and thermodynamic properties during their combustion process is of great significance for optimizing propulsion system design and improving overall performance. Combustion temperature is one of the most important parameters to characterize the energy release and thermodynamic state during fuel combustion, which is crucial for accurately establishing a computational combustion model. Based on the principle of radiation, the combustion temperature of powder fuel particles can be measured, including single-point spectroscopy, single-point colorimetry, interferometry, and anti-Stokes Raman spectroscopy. However, these methods make it difficult to obtain the two-dimensional temperature distribution of powder fuel particles and their temperature evolution with high temporal and spatial resolution.

[0004] For individual fuel particles in solid fuel engines, the size distribution ranges from submicron to submillimeter, and the corresponding combustion time is quite short, reaching milliseconds. In addition, the radiation intensity of different types of fuel particles during combustion oscillates significantly by several orders of magnitude, making the signal response in the photodetector extremely weak or overexposed, resulting in failure of temperature measurement.

[0005] To address these issues, this patent proposes a temperature measurement device and method with high temporal and spatial resolution, which couples a single-point photoelectric colorimetric pyrometer based on a photoelectric sensor and a two-dimensional spatial resolution colorimetric thermometer based on an image sensor to achieve microsecond and sub-micron temporal and spatial resolution. The two complement each other in time and space to achieve high temporal and spatial resolution characterization of the combustion temperature of micro / nano fuel particles, and applies this method to the measurement of combustion particle temperature in solid fuel engines. Summary of the invention

[0006] The present invention solves the problems existing in the existing fuel particle combustion temperature measurement technology and provides a temperature measurement device with high temporal and spatial resolution, a calibration method and application thereof; The temperature measurement device with high temporal and spatial resolution of the present invention comprises a microscope objective, a spectroscope, two convex lenses, a single-point photoelectric colorimetric pyrometer, a high-speed image sensor and a synchronous control module. The microscope objective and the first spectroscope are located on the same axis. The microscope objective is used to couple the radiation signal of the object to be measured. The first spectroscope is used to divide the radiation signal of the object to be measured into two radiation signals. After the two radiation signals are amplified and focused by the two convex lenses, one is transmitted to the single-point photoelectric colorimetric pyrometer, and the other is transmitted to the high-speed image sensor. By setting a convex lens to amplify and focus light, it is ensured that the radiation signal coming out of the objective can be completely captured by the target surface of the camera or the photoelectric pyrometer, so that the collected image is clearer.

[0007] The single-point photoelectric colorimetric pyrometer and the high-speed image sensor are both connected to the synchronous control module through lines, and the synchronous control module synchronously controls the ignition of the ignition device and the signal collection of the single-point photoelectric colorimetric pyrometer and the high-speed image sensor.

[0008] The single-point photoelectric colorimetric pyrometer includes an optical fiber, a fiber collimator, multiple spectroscopes, a filter and multiple photoelectric sensors. The optical fiber combines a radiation signal of the object to be measured separated by the first spectroscope. A fiber collimator is arranged at the tail of the optical fiber to shape the light beam to ensure that the radiation signal can be completely transmitted to the spectroscope, thereby ensuring the accuracy of subsequent detection. The radiation signal after passing through the fiber collimator is divided into multiple radiation signals through multiple spectroscopes, and radiation signals of different wavelengths are extracted from the multiple radiation signals through filters. The radiation signals of different wavelengths are linearly converted into voltage signals through photoelectric sensors.

[0009] The single-point photoelectric colorimetric pyrometer is used to extract the radiation signal of a specific wavelength from the radiation signal of the object to be measured; the high-speed image sensor is used to extract the radiation signal of a specific wavelength from the pixel channel corresponding to the imaging surface, convert the radiation signal into a voltage signal through the internal circuit of the system, and finally convert it into digital image data through the analog-to-digital conversion module.

[0010] The single-point photoelectric colorimetric pyrometer and the high-speed image sensor can measure the radiation signal of the object to be measured at a specific wavelength after calibration; the colorimetric temperature measurement formula is used to convert the radiation signal of the specific wavelength in the radiation signal of the object to be measured extracted by the single-point photoelectric colorimetric pyrometer and the high-speed image sensor into the target temperature to be measured; thereby achieving high temporal and spatial resolution characterization of the combustion temperature of micro / nano fuel particles.

[0011] Furthermore, the synchronization control module realizes synchronous control of the equipment through digital signals and analog signals. Preferably, the synchronization control module is a PXI measurement system, which collects the response voltage signal of the single-point photoelectric colorimetric pyrometer based on the PXI bus and completes the analog-to-digital conversion.

[0012] Furthermore, the optical filter is a narrow-band filter and a frame.

[0013] Preferably, the high-speed image sensor is a high-speed CMOS camera.

[0014] The calibration method of the temperature measurement device is as follows: the single-point photoelectric colorimetric pyrometer and the high-speed image sensor are offline calibrated by the same standard source to obtain the spectral response sensitivity or the spectral response curve; after the offline calibration is completed, the single-point photoelectric colorimetric pyrometer and the high-speed image sensor are coupled; then the coupling device is online calibrated to obtain the single-point photoelectric colorimetric pyrometer coupling spectrum correction coefficient A1 and the high-speed image sensor coupling spectrum correction coefficient A2; the RGB three-channel measurement value of the high-speed image sensor, the response voltage of the single-point photoelectric colorimetric pyrometer, the single-point photoelectric colorimetric pyrometer coupling spectrum correction coefficient A1, the high-speed image sensor coupling spectrum correction coefficient A2, the spectral response curve obtained by offline calibration, the amplification factor curve, and the spectral response sensitivity are substituted into the colorimetric temperature measurement formula to obtain the single-point high time resolution representation of the combustion temperature T of the object to be measured and the two-dimensional spatial distribution representation of the combustion temperature T of the object to be measured; and the specific wavelength radiation signal of the target to be measured is correctly represented.

[0015] The colorimetric temperature measurement formula is: ; In the formula Indicates temperature, is the second radiation constant, , Represents different wavelengths, , Indicates the radiation intensity of radiation signals of different wavelengths.

[0016] Furthermore, the specific steps of offline calibration of the single-point photoelectric colorimetric pyrometer and the high-speed image sensor to obtain the spectral response sensitivity or spectral response curve are as follows: The single-point photoelectric colorimetric pyrometer or high-speed image sensor used in the actual measurement is fixed to the same position of the same standard radiation source. The gain module amplification factor of the single-point photoelectric colorimetric pyrometer and the working parameters of the high-speed image sensor are set, and the standard radiation source is heated to record the single-point photoelectric colorimetric pyrometer response voltage data and the image signal obtained by the high-speed image sensor.

[0017] The offline calibration process of high-speed image sensors is as follows: The working temperature of the standard radiation source is set, and the standard radiation source image is sampled using a fixed white balance curve and imaging parameters. After collecting image signals at each temperature point, the average measurement value of the RGB three channels at each temperature calibration point is obtained. The correction value at each temperature point can be obtained by comparing the measurement value at the temperature calibration point with the radiation intensity at three wavelengths of the theoretical standard source radiation; the spectral response curve of the high-speed image sensor can be obtained by performing the least squares fitting on the correction value at each temperature point.

[0018] The offline calibration process of a single-point photoelectric colorimetric pyrometer is as follows: The response voltage signal of a single-point photoelectric colorimetric pyrometer is not only related to its spectral sensitivity, but also to the internal amplification circuit. Therefore, before calibrating the spectral sensitivity, a standard radiation source is used to calibrate the amplification factor of the internal amplification circuit to obtain the amplification factor curve, and the same amplification factor is used for calibration in the subsequent correction value calibration process.

[0019] Set the working temperature of the standard radiation source, the control voltage and response signal acquisition frequency of the single-point photoelectric colorimetric pyrometer, aim the single-point photoelectric colorimetric pyrometer at the standard radiation source, continuously collect the single-point photoelectric colorimetric pyrometer response voltage value within the set period, and perform average processing on the collected data to reduce the error. Comparing the response voltage obtained after the average processing with the theoretical radiation intensity can obtain the spectral response sensitivity at each temperature point.

[0020] Furthermore, the specific steps of online calibration of the coupled single-point photoelectric colorimetric pyrometer and the high-speed image sensor to obtain the coupled spectrum correction coefficient A1 of the single-point photoelectric colorimetric pyrometer and the coupled spectrum correction coefficient A2 of the high-speed image sensor are as follows: First, place the calibrated standard radiation source on the imaging plane at the front end of the microscope objective lens, use the synchronous control system to control the single-point photoelectric colorimetric pyrometer and the high-speed image sensor to synchronously collect signals from the standard radiation source, and record the response voltage data of the single-point photoelectric colorimetric pyrometer. ; Process the image data captured by the high-speed image sensor, calculate the average value of the central area of ​​the standard radiation source target surface in the captured image, and obtain the average measurement value of the three channels of each pixel .

[0021] Then, the single-point photoelectric colorimetric pyrometer and the high-speed image sensor are directly aimed at the standard radiation source, and the synchronous control system is used to control the single-point photoelectric colorimetric pyrometer and the high-speed image sensor for synchronous signal acquisition, and the response voltage data of the single-point photoelectric colorimetric pyrometer is recorded. The image data captured by the high-speed image sensor is averaged and the central area of ​​the standard radiation source target surface in the captured image is calculated to obtain the average measurement value of the three channels of each pixel. .

[0022] Finally, based on the recorded data, the single-point photoelectric colorimetric pyrometer coupled spectrum correction coefficient A1 and the high-speed image sensor coupled spectrum correction coefficient A2 are obtained.

[0023] Preferably, the standard radiation source in the off-line calibration is a black body furnace, and the standard radiation source in the on-line calibration is a standard tungsten halogen lamp.

[0024] The temperature measurement device with high temporal and spatial resolution is applied to the measurement of the combustion temperature of micro / nano fuel particles.

[0025] Since the combustion of micro-nano fuel particles has the characteristics of short duration, weak radiation signal and large variation of fire radiation signal, it is difficult for traditional temperature measurement methods to accurately characterize the complete combustion process of micro-nano fuel particles. The present invention proposes a measurement device for measuring the combustion temperature of micro / nano fuel particles by coupling a single-point photoelectric colorimetric pyrometer and a high-speed image sensor, which can achieve high temporal and spatial resolution characterization of the combustion temperature of micro / nano fuel particles. In order to ensure the traceability and accuracy of the measurement results, before using the detection device, the single-point photoelectric colorimetric pyrometer and the high-speed image sensor camera are calibrated offline using the same standard radiation source (through the same blackbody furnace); after completing the offline calibration, the detection device needs to be calibrated online using the same standard source to correct the influence of the coupled optical path on the spectral information of the radiation signal. After completing the online calibration, the high-speed image sensor is controlled by the synchronous control system to continuously collect flame images of the fuel particles to be tested, and the response voltage signal of the single-point photoelectric colorimetric thermometer is simultaneously collected. Based on the online calibration and offline calibration results, the flame image data is converted into a two-dimensional distribution of the radiation intensity of the specific wavelength of the target to be tested, and the response voltage signal of the photoelectric colorimetric thermometer is converted into the overall specific wavelength radiation intensity of the target to be tested. Then, the two-dimensional temperature distribution of the target to be tested and the single-point time-temperature curve are obtained through the colorimetric temperature measurement formula. The same fuel particle is measured simultaneously by a single-point photoelectric colorimetric pyrometer based on a photoelectric sensor and a two-dimensional spatial resolution colorimetric thermometer based on an image sensor, thereby effectively solving the scientific problem of multi-dimensional high-temporal and spatial resolution characterization of the combustion temperature of micro-nano fuel particles. Compared with traditional temperature measurement methods, it can provide temperature data with higher time resolution and two-dimensional temperature distribution of fuel particles, thereby helping experimenters analyze or simulate the combustion temperature evolution and combustion mechanism of fuel particles, and improve the combustion performance of fuel particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is the overall structural block diagram of the device of the present invention; Figure 2 for Figure 1 The overall structural block diagram of the single-point photoelectric colorimetric pyrometer; Figure 3 The evolution curve of the maximum combustion temperature of the fuel particles to be tested measured by the high-speed CMOS camera and the time-temperature curve of the combustion temperature of the fuel particles to be tested measured by the single-point photoelectric colorimetric pyrometer in Application Example 1; Figure 4 The two-dimensional representation diagram of the combustion temperature of the fuel particles to be tested measured by the high-speed CMOS camera in Application Example 1; Figure 5 The evolution curve of the maximum combustion temperature of the fuel particles to be tested measured by the high-speed CMOS camera and the time-temperature curve of the combustion temperature of the fuel particles to be tested measured by the single-point photoelectric colorimetric pyrometer in Application Example 2; Figure 6 A two-dimensional representation diagram of the combustion temperature of the fuel particles to be tested measured by a high-speed CMOS camera in Application Example 2; Figure 7 is the time-temperature curve of the combustion temperature of the fuel particles to be tested measured by the single-point photoelectric colorimetric pyrometer in Application Example 3; Figure 8 A two-dimensional representation diagram of the combustion temperature of the fuel particles to be tested measured by a high-speed CMOS camera in Application Example 3; Fig. 9 The evolution curve of the maximum combustion temperature of the fuel particles to be tested measured by the high-speed CMOS camera and the time-temperature curve of the combustion temperature of the fuel particles to be tested measured by the single-point photoelectric colorimetric pyrometer in Application Example 4; Fig.10 A two-dimensional representation diagram of the combustion temperature of the fuel particles to be tested measured by a high-speed CMOS camera in Application Example 4; Fig.11 The evolution curve of the maximum combustion temperature of the fuel particles to be tested measured by the high-speed CMOS camera and the time-temperature curve of the combustion temperature of the fuel particles to be tested measured by the single-point photoelectric colorimetric pyrometer in Application Example 5; Fig.12 This is a two-dimensional representation of the combustion temperature of the fuel particles to be tested measured by a high-speed CMOS camera in Application Example 5. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form also includes the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this description, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1 As shown, a temperature measurement device with high temporal and spatial resolution includes a microscope objective lens S1, a spectroscope S2, two convex lenses, a single-point photoelectric colorimetric pyrometer, a high-speed image sensor, and a synchronous control module. The microscope objective lens S1 and the first spectroscope S2 are located on the same axis. The microscope objective lens S1 is used to couple the radiation signal of the object to be measured, and the first spectroscope S2 is used to divide the radiation signal of the object to be measured into two radiation signals; the two radiation signals are respectively amplified and focused by two convex lenses (S3 / S4), one of which is transmitted to the single-point photoelectric colorimetric pyrometer, and the other is transmitted to the high-speed image sensor. By setting a convex lens to amplify and focus light, it is ensured that the radiation signal coming out of the objective lens can be completely captured by the camera or the target surface of the photoelectric pyrometer, so that the collected image is clearer.

[0032] The single-point photoelectric colorimetric pyrometer and the high-speed image sensor are both connected to the synchronous control module through lines, and the synchronous control module synchronously controls the ignition of the ignition device and the signal collection of the single-point photoelectric colorimetric pyrometer and the high-speed image sensor.

[0033] The synchronous control module is a PXI measurement system, which can collect the response voltage signal of the single-point photoelectric colorimetric pyrometer based on the PXI bus and complete the analog-to-digital conversion. The PXI measurement system used in this embodiment is a PXI measurement system produced by Shanghai Jianyi Co., Ltd., the PXI chassis model is PXIe-2313; the acquisition card model is PXIe-9813 and PXIe-5510.

[0034] like Figure 2 As shown, the single-point photoelectric colorimetric pyrometer includes an optical fiber, an optical fiber collimator, multiple spectroscopes, an optical filter and multiple photoelectric sensors. A radiation signal of the object to be measured separated by the first spectroscope is combined through the optical fiber; an optical fiber collimator is arranged at the tail of the optical fiber to shape the light beam to ensure that the radiation signal can be completely transmitted to the spectroscope, thereby ensuring the accuracy of subsequent detection; the radiation signal after passing through the optical fiber collimator is divided into multiple radiation signals through multiple spectroscopes, and radiation signals of different wavelengths are extracted from the multiple radiation signals through filters; radiation signals of different wavelengths are linearly converted into voltage signals through photoelectric sensors.

[0035] In this embodiment, the optical filter is a narrow-band filter and a mirror frame, and the photoelectric sensor is a photomultiplier tube PMT module of model H10722-20 produced by Hamamatsu Photonics Co., Ltd.

[0036] The high-speed image sensor used in this embodiment is a high-speed CMOS camera, model Phantom M310, which can convert the radiation signal of the object to be measured into digital image data.

[0037] In this embodiment, three photoelectric sensors are taken as an example. Two optical splitters are provided to divide the radiation signal after passing through the optical fiber collimator into three paths. The three radiation signals are filtered by filters respectively and then enter the three photoelectric sensors for linear conversion.

[0038] The single-point photoelectric colorimetric pyrometer is used to extract the radiation signal of a specific wavelength from the radiation signal of the object to be measured; the high-speed CMOS camera is used to extract the radiation signal of a specific wavelength in the RGB three channels of the imaging surface, and convert the radiation signal into a voltage signal through the internal circuit of the system, and finally convert it into digital image data through the analog-to-digital conversion module.

[0039] The high-speed CMOS camera has a Bayer filter in front. The radiation signal of the fuel particles to be tested is converted into a radiation signal of a specific wavelength after passing through the Bayer filter, and then transmitted to the photodiode in the pixel array of the CMOS high-speed camera. Each pixel photodiode converts the received radiation signal of a specific wavelength into an electric charge, and then reads and amplifies these charge signals through the row and column scanning circuits, and finally converts the analog signal into a digital signal through the analog-to-digital converter to realize the extraction of the radiation signal of the specific wavelength of the fuel particles to be tested.

[0040] According to Planck's formula, the radiation intensity of a non-black body is ; is the wavelength, is the temperature, is the emissivity of the object.

[0041] when When Planck's formula can be simplified to Wien's formula, the radiation intensity is: ; In the formula, the first radiation constant , the second radiation constant , h is Planck's constant, c is the speed of light, and k is the Boltzmann constant.

[0042] Based on Wien's law, the radiation signal of the object to be measured is a function of temperature, wavelength and emissivity. And for flame signals, the industry often treats them as gray bodies, that is, their emissivity is independent of wavelength. Therefore, the colorimetric temperature measurement formula can be derived by the radiation intensity at multiple different wavelengths: ; , Indicates different wavelengths.

[0043] Taking three channels as an example, the three-channel colorimetric temperature measurement formula is: ; In the formula , , It represents the characteristic wavelengths corresponding to the three channels of the single-point photoelectric colorimetric pyrometer. Based on the above equation, the temperature of the target to be measured can be calculated by correctly characterizing the specific wavelength radiation intensity of the target to be measured.

[0044] The photoelectric sensor and high-speed CMOS camera used in the single-point photoelectric colorimetric pyrometer have spectral response sensitivity, that is, for radiation signals with different wavelengths and the same radiation intensity, the response voltage signal of the single-point photoelectric colorimetric pyrometer is different from the pixel channel response value of the high-speed CMOS camera. To ensure the traceability and accuracy of the measurement results, the single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera should be calibrated offline with the same standard radiation source (through the same blackbody furnace) before use to obtain the spectral response sensitivity or spectral response curve; the specific steps are as follows:

[0045] The single-point photoelectric colorimetric pyrometer or high-speed CMOS camera used in the actual measurement is successively fixed to the appropriate distance of the blackbody furnace, so that the two are aligned with the target surface of the blackbody furnace. The reason for using the blackbody furnace as the target to be measured is that the blackbody furnace is a standard radiation source, which can generate a blackbody radiation signal at a specific temperature.

[0046] The amplification factor of the single-point photoelectric colorimetric pyrometer gain module and the working parameters of the high-speed CMOS camera were set, the blackbody furnace was heated up, and the temperature was controlled between 800℃ and 3000℃. The single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera were calibrated respectively by the blackbody furnace, and the response voltage data of the single-point photoelectric colorimetric pyrometer and the image signal obtained by the high-speed CMOS camera were recorded.

[0047] The single-point photoelectric colorimetric pyrometer used in this embodiment is a photomultiplier tube, whose internal amplification factor is related to its control voltage, with the minimum control voltage being 0.5V and the maximum control voltage being 1.1V.

[0048] The offline calibration process of high-speed CMOS camera is as follows: The working temperature of the blackbody furnace is set to gradually increase from 800℃ to 3000℃, with a temperature increase step of 100℃. The blackbody furnace target surface image is sampled using a fixed white balance curve and imaging parameters. After collecting the image signal at each temperature point, the center area of ​​the blackbody furnace target surface is selected to calculate the average value, and the average measurement value of the RGB three channels at each temperature calibration point is obtained. Since the radiation signal of the blackbody furnace satisfies the blackbody radiation law, the radiation intensity at the three wavelengths of the theoretical blackbody radiation can be compared with the measured value at the temperature calibration point. By comparison, the correction value Kt at each temperature point can be obtained. ;

[0049] Where T is the real-time temperature of the blackbody furnace, The wavelength measured at the center of the camera's R, G, and B pixel channels. The spectral response curve of the high-speed CMOS camera can be obtained by performing a least squares fit on the correction value Kt at each temperature point. . Combined with the spectral response curve The three-channel measurement values ​​of RGB of the camera can correctly characterize the radiation signal of the specific wavelength of the target to be measured, and then the temperature of the target to be measured can be obtained through the colorimetric temperature measurement formula, that is: .

[0050] The offline calibration process of a single-point photoelectric colorimetric pyrometer is as follows: Compared with high-speed CMOS cameras, the response voltage signal of a single-point photoelectric colorimetric pyrometer is not only related to its spectral sensitivity, but also to the internal amplification circuit. Therefore, before calibrating the spectral sensitivity, a blackbody furnace should be used to calibrate the internal amplification circuit amplification factor, and the same amplification factor should be used for calibration in the subsequent correction value calibration process.

[0051] First, the temperature of the blackbody furnace was set to 1000 degrees Celsius, and the three-channel photomultiplier tube control voltage was set from 0.5V to 1mV step to measure the radiation signal of the blackbody furnace, and a series of response voltage values ​​were obtained. , the least squares fitting of the series of response voltage values ​​is performed to obtain the three-channel photomultiplier tube amplification factor curve .

[0052] Then, set the temperature of the blackbody furnace to Tb, which is any temperature between 800℃ and 3000℃; use a single-point photoelectric colorimetric pyrometer to align with the target surface of the blackbody furnace, set the three-channel control voltage to 0.5V, and control the synchronous trigger control module to continuously collect the three-channel photoelectric sensor response voltage value of the single-point photoelectric colorimetric pyrometer for 5s at a sampling frequency of 10Khz, and perform average processing on the collected data to reduce the error. The three-photomultiplier tube response voltage obtained after the average processing Since the radiation signal of the blackbody furnace satisfies the blackbody radiation law, the measured value at the temperature calibration point can be compared with the radiation intensity of the theoretical blackbody radiation at three wavelengths. By comparison, the spectral response sensitivity at each temperature point can be obtained. Based on the colorimetric temperature measurement equation, the spectral response sensitivity calculation formula is as follows: ;

[0053] In the formula, The three channels of the single-point photoelectric colorimetric pyrometer correspond to the characteristic wavelengths, combined with the spectral response sensitivity , Amplification factor curve The specific wavelength radiation signal of the target to be measured can be correctly characterized by the response voltage of the three photomultiplier tubes, and then the temperature of the target to be measured can be obtained through the colorimetric temperature measurement formula, that is: T = C 2 2 λ 2 − 1 λ 1 − 1 λ 3 ln L λ 1 ,T ⋅L λ 3 ,T L 2 λ 2 ,T +5 ln λ 1 ⋅ λ 3 λ 2 2 = C 2 ⋅ 2 λ 2 − 1 λ 1 − 1 λ 3 ln V cℎ1 ⋅f V cℎ1 × V cℎ3 ⋅f V cℎ3 [ V cℎ2 ⋅f( V cℎ2 ) ] 2 ⋅ g 0 +5 ln λ 1 ⋅ λ 3 λ 2 2 .

[0054] After completing the offline calibration, the single-point photoelectric colorimetric pyrometer is coupled with the high-speed CMOS camera (the installation of the temperature measuring device is completed); then the coupling device is calibrated online to obtain the single-point photoelectric colorimetric pyrometer coupling spectrum correction coefficient A1 and the CMOS camera coupling spectrum correction coefficient A 2， To correct the influence of the coupling optical path on the spectral information of the radiation signal; the specific steps are as follows: First, place a calibrated standard halogen tungsten lamp on the imaging plane at the front of the microscope objective lens. After the halogen tungsten lamp is powered on and preheated to ensure working stability. After the halogen tungsten lamp is preheated, a synchronous control system is used to control the single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera to perform synchronous signal acquisition and record the single-point photoelectric colorimetric pyrometer response voltage data. ; Process the image data captured by the high-speed CMOS camera, calculate the average value of the central area of ​​the halogen tungsten lamp target surface in the captured image, and obtain the average measurement value of the three channels of each pixel .

[0055] Then, the single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera are directly aimed at the halogen tungsten lamp (without passing through the split light path and the microscope objective lens). The single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera are controlled by a synchronous control system to collect synchronous signals and record the response voltage data of the single-point photoelectric colorimetric pyrometer. The image data captured by the high-speed CMOS camera is averaged and the central area of ​​the halogen tungsten lamp target surface in the captured image is calculated to obtain the average measurement value of the three channels of each pixel. .

[0056] Finally, based on the recorded data, the single-point photoelectric colorimetric pyrometer coupled spectrum correction coefficient A1 and the CMOS camera coupled spectrum correction coefficient A2 are obtained. 1、 The expression of A2 is as follows:

[0057] ; .

[0058] The spectral response curve obtained by coupling the single-point photoelectric colorimetric pyrometer with the spectral correction coefficient A1, the CMOS camera with the spectral correction coefficient A2, and the offline calibration , spectral response sensitivity Substitute into the color temperature formula; The single-point high time resolution of the combustion temperature T of the object to be measured is characterized as: T= C 2 ⋅ 2 λ 2 − 1 λ 1 − 1 λ 3 ln V cℎ1 ⋅f V cℎ1 × V cℎ3 ⋅f V cℎ3 [ V cℎ2 ⋅f( V cℎ2 ) ] 2 ⋅ g 0 ⋅ A 1 +5 ln λ 1 ⋅ λ 3 λ 2 2 ; In the formula, is the response voltage signal of the three-color colorimetric pyrometer, is the gain module amplification factor of each channel of the single-point photoelectric colorimetric pyrometer, The spectral response coefficient of the single-point photoelectric colorimetric pyrometer calibrated in step 2; The three channels of the single-point photoelectric colorimetric pyrometer correspond to the characteristic wavelengths. is the second radiation constant =hc / k=1.4388×10^(-2) m, obtained from Planck's blackbody radiation law.

[0059] The two-dimensional spatial distribution of the combustion temperature T of the object to be tested is characterized as follows: ; In the formula, R, G, and B are the response values ​​of each pixel channel of the two-dimensional spatial resolution colorimetric thermometer, is the spectral response curve of the high-speed CMOS camera; is the central wavelength corresponding to each pixel channel of the two-dimensional spatial resolution colorimetric thermometer, for is the second radiation constant =hc / k=1.4388×10^(-2) m, obtained from Planck's blackbody radiation law.

[0060] The single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera can correctly characterize the radiation signal of a specific wavelength of the object to be measured after calibration; the colorimetric temperature measurement formula is used to convert the radiation signal of a specific wavelength in the radiation signal of the object to be measured extracted by the single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera into the target temperature to be measured; thereby achieving high temporal and spatial resolution characterization of the combustion temperature of micro / nano fuel particles.

[0061] In solid fuel engines, commonly used powder fuels include aluminum, magnesium, boron and composite fuels. The above device and method are applied using the following application example. The microscope objective lens used in the application example has a magnification of 20×, a spatial resolution of 0.75μm, and a time resolution that can be determined based on the frame rate, exposure time, photomultiplier tube and adoption rate of the high-speed CMOS camera, which can reach the μs level. Since the combustion radiation intensity of different micro-nano fuel particles to be tested is different, the control voltage and exposure time should be reasonably set during the test so that the radiation signal intensity is within the response threshold range of the single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera.

[0062] Application Example 1 A single micro / nano fuel particle is used for combustion testing. The images taken by a high-speed CMOS camera and the response values ​​of a single-point photoelectric colorimetric pyrometer are synchronously collected through a synchronous control system. Finally, a two-dimensional distribution video of the combustion temperature of a single fuel particle and a time-temperature curve with high time resolution are obtained.

[0063] In this example, the exposure time of the high-speed CMOS camera is adjusted to 99 μs, the shooting frame rate is 10000 fps, and the resolution is 512×512; the sampling rate of the single-point photoelectric colorimetric pyrometer is set to 1,000,000 Hz, and the amplification gain module is set to 1; the fuel particle to be tested is selected as single-particle micron aluminum, with an equivalent particle size of 15.3 μm.

[0064] The single-point photoelectric colorimetric pyrometer couples the radiation signal through optical fiber, and has a narrow-band filter and a photomultiplier tube inside that can convert the radiation intensity of a specific wavelength into a voltage signal. The specific measurement steps are:

[0065] Step 1: After completing the offline calibration and online calibration of the single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera, place the single fuel to be tested on the imaging surface of the microscope objective of the temperature measurement device.

[0066] Step 2: Use a synchronous control system to control the ignition device to ignite the fuel particles, synchronously trigger the high-speed CMOS camera to continuously take pictures, and the single-point photoelectric colorimetric pyrometer sensor to collect the response signal.

[0067] Step 3: Convert the image taken by the high-speed CMOS camera and the response signal of the single-point photoelectric colorimetric pyrometer sensor into the specific wavelength radiation intensity of the combustion of the measured particle. The high-speed CMOS camera obtains the two-dimensional representation of the combustion temperature of the measured fuel particle through the colorimetric temperature measurement formula (such as Figure 4 As shown in the figure) and the evolution curve of the maximum combustion temperature of the fuel particles to be tested (as shown in the figure) Figure 3 As shown in the figure, the single-point photoelectric colorimetric pyrometer obtains the time-temperature curve of the combustion temperature of the fuel particles to be measured with high time resolution through the colorimetric temperature measurement formula (as shown in the figure). Figure 3 as shown).

[0068] Figure 3 The middle dotted line part indicates that the radiation signal intensity exceeds the threshold of the high-speed CMOS camera sensor during the actual measurement process, resulting in inaccurate measured data. However, at this time, the single-point photoelectric colorimetric pyrometer can still measure the radiation signal of the target to be measured. At this time, the single-point photoelectric colorimetric pyrometer serves as a temporal supplement to the data measured by the high-speed CMOS camera, thereby improving the temperature characterization integrity of the system.

[0069] Application Example 2 In this example, the exposure time of the high-speed CMOS camera is adjusted to 90μs, the shooting frame rate is 11000fps, and the resolution is 512×512; the sampling rate of the single-point photoelectric colorimetric pyrometer is set to 1,000,000Hz, and the amplification gain module is set to 1; the fuel particles to be tested are selected as nano-aluminum, with a nominal particle size of 100nm and a cluster equivalent particle size of 56.6μm. The specific steps for measuring the combustion temperature of nano-aluminum are as follows:

[0070] Step 1: After completing the offline calibration and online calibration correction of the device, place the fuel particles to be measured on the imaging surface of the microscope objective of the temperature measurement device.

[0071] Step 2: Use a synchronous control system to control the ignition device to ignite the fuel particles, and synchronously control the high-speed CMOS camera to collect image data and synchronously collect the single-point photoelectric colorimetric pyrometer sensor response signal.

[0072] Step 3: Convert the image taken by the high-speed CMOS camera and the response signal of the single-point photoelectric colorimetric pyrometer sensor into the specific wavelength radiation intensity of the combustion of the measured particles. The CMOS camera obtains the two-dimensional representation of the combustion temperature of the measured fuel particles through the colorimetric temperature measurement formula (such as Figure 6 As shown in the figure) and the evolution curve of the maximum combustion temperature of the fuel particles to be tested (as shown in the figure) Figure 5 As shown in the figure, the single-point photoelectric colorimetric pyrometer obtains the time-temperature curve of the combustion temperature of the fuel particles to be measured with high time resolution through the colorimetric temperature measurement formula (as shown in the figure). Figure 5 as shown).

[0073] from Figure 5 It can be observed that the temperature data measured by the two methods have good trend consistency, and compared with the data measured by the high-speed CMOS camera, the temperature measurement resolution of the single-point photoelectric colorimetric pyrometer on the time scale is higher, and the high-speed CMOS camera can realize the two-dimensional temperature characterization of the fuel particles to be measured. The two complement each other in time and space, improving the overall temperature characterization capability of the system.

[0074] Application Example 3 In this example, the exposure time of the high-speed CMOS camera is adjusted to 5μs, the shooting frame rate is 10000fps, and the resolution is 512×512; the sampling rate of the single-point photoelectric colorimetric pyrometer is set to 1,000,000Hz, and the amplification gain module is set to 1; the fuel particles to be tested are selected as micron magnesium, and the equivalent particle size is 68.0μm. The specific steps for the combustion temperature of micron magnesium are as follows:

[0075] Step 1: After completing the offline calibration and online calibration of the device, place the single fuel to be tested on the imaging surface of the microscope objective of the temperature measurement device.

[0076] Step 2: Use a synchronous control system to control the ignition device to ignite the fuel particles, and synchronously control the high-speed CMOS camera to collect image data and synchronously collect the single-point photoelectric colorimetric pyrometer sensor response signal.

[0077] Step 3: Convert the image taken by the high-speed CMOS camera and the response signal of the single-point photoelectric colorimetric pyrometer sensor into the specific wavelength radiation intensity of the combustion of the measured particles. The CMOS camera obtains the two-dimensional representation of the combustion temperature of the measured fuel particles through the colorimetric temperature measurement formula (such as Figure 8 As shown in the figure, the single-point photoelectric colorimetric pyrometer obtains the time-temperature curve of the combustion temperature of the fuel particles to be measured with high time resolution through the colorimetric temperature measurement formula (as shown in the figure). Figure 7 as shown).

[0078] Due to the extremely short combustion time, the high-speed CMOS camera can only collect a single two-dimensional distribution of the combustion meteorological flame temperature, but the single-point photoelectric colorimetric pyrometer can still measure the complete combustion time-temperature curve of the fuel particles to be tested. At this time, the single-point photoelectric colorimetric pyrometer provides a supplement to the temperature characterization of the CMOS camera on the time scale.

[0079] Application Example 4 In this embodiment, the exposure time of the high-speed CMOS camera is adjusted to 50μs, the shooting frame rate is 10000fps, and the resolution is 512×512; the sampling rate of the single-point photoelectric colorimetric pyrometer is set to 1,000,000Hz, and the amplification gain module is set to 1; the fuel particles to be tested are boron carbide, with an equivalent particle size of 10.9μm. The specific steps for the combustion temperature of boron carbide are as follows:

[0080] Step 1: After completing the offline calibration and online calibration correction of the device, place the single fuel to be tested on the imaging surface of the microscope objective of the temperature measurement device.

[0081] Step 2: Use a synchronous control system to control the ignition device to ignite the fuel particles, and synchronously control the high-speed CMOS camera to collect image data and synchronously collect the single-point photoelectric colorimetric pyrometer sensor response signal.

[0082] Step 3: Convert the image taken by the high-speed CMOS camera and the response signal of the single-point photoelectric colorimetric pyrometer sensor into the specific wavelength radiation intensity of the combustion of the measured particles. The CMOS camera obtains the two-dimensional representation of the combustion temperature of the measured fuel particles through the colorimetric temperature measurement formula (such as Fig.10 As shown in the figure) and the evolution curve of the maximum combustion temperature of the fuel particles to be tested (as shown in the figure) Fig. 9 As shown in the figure, the single-point photoelectric colorimetric pyrometer obtains the time-temperature curve of the combustion temperature of the fuel particles to be measured with high time resolution through the colorimetric temperature measurement formula (as shown in the figure). Fig. 9 as shown).

[0083] from Fig. 9It can be seen that when the combustion radiation signal is strong in the early stage, the maximum temperature curve of the high-speed CMOS camera and the temperature curve of the single-point photoelectric colorimetric pyrometer have good temperature consistency. However, as the combustion intensity weakens in the later stage, the radiation signal decreases. Since the radiation detection ability of the high-speed CMOS camera is weaker than that of the single-point photoelectric colorimetric pyrometer, the measured response signal is greatly affected by the background noise, resulting in a low temperature calculation result. At this time, the temperature characterization should be based on the single-point photoelectric colorimetric pyrometer.

[0084] Application Example 5 In this example, the exposure time of the high-speed CMOS camera is adjusted to 99μs, the shooting frame rate is 10000fps, and the resolution is 512×512; the sampling rate of the single-point photoelectric colorimetric pyrometer is set to 1,000,000Hz, and the amplification gain module is set to 1; the fuel particles to be tested are amorphous boron, with a nominal particle size of 100nm and a cluster equivalent particle size of 88.0μm. The specific steps for the combustion temperature of amorphous boron are as follows:

[0085] Step 1: After completing the offline calibration and online calibration correction of the device, place the single fuel to be tested on the imaging surface of the microscope objective of the temperature measurement device.

[0086] Step 2: Use a synchronous control system to control the ignition device to ignite the fuel particles, and synchronously control the high-speed CMOS camera to collect image data and synchronously collect the single-point photoelectric colorimetric pyrometer sensor response signal.

[0087] Step 3: Convert the image taken by the high-speed CMOS camera and the response signal of the single-point photoelectric colorimetric pyrometer sensor into the specific wavelength radiation intensity of the combustion of the measured particles. The CMOS camera obtains the two-dimensional representation of the combustion temperature of the measured fuel particles through the colorimetric temperature measurement formula (such as Fig.12 As shown in the figure) and the evolution curve of the maximum combustion temperature of the fuel particles to be tested (as shown in the figure) Fig.11 As shown in the figure, the single-point photoelectric colorimetric pyrometer obtains the time-temperature curve of the combustion temperature of the fuel particles to be measured with high time resolution through the colorimetric temperature measurement formula (as shown in the figure). Fig.11 as shown).

[0088] The above application examples 1 to 5 realize the complete single-point time-temperature measurement and two-dimensional distribution characterization of the combustion temperature of different micro-nano fuel particles (aluminum, magnesium, boron, etc.) by using a single-point photoelectric colorimetric pyrometer and a high-speed CMOS camera. By coupling a single-point photoelectric colorimetric pyrometer based on a photoelectric sensor and a two-dimensional spatial resolution colorimetric thermometer based on an image sensor, the two complement each other in time and space during the application process, thereby improving the overall temperature characterization capability of the system.

Claims

1. A temperature measurement device with high temporal and spatial resolution, characterized in that: It includes a microscope objective, a spectroscope, two convex lenses, a single-point photoelectric colorimetric pyrometer, a high-speed image sensor and a synchronous control module; the microscope objective and the first spectroscope are located on the same axis, the microscope objective is used to couple the radiation signal of the object to be measured, and the first spectroscope is used to divide the radiation signal of the object to be measured into two radiation signals; the two radiation signals are respectively amplified and focused by two convex lenses, one of which is transmitted to the single-point photoelectric colorimetric pyrometer, and the other is transmitted to the high-speed image sensor; The single-point photoelectric colorimetric pyrometer and the high-speed image sensor are both connected to the synchronous control module through a line, and the synchronous control module synchronously controls the ignition of the ignition device and the signal collection of the single-point photoelectric colorimetric pyrometer and the high-speed image sensor; The single-point photoelectric colorimetric pyrometer includes an optical fiber, an optical fiber collimator, multiple spectroscopes, an optical filter, and multiple photoelectric sensors. It receives a radiation signal of an object to be measured separated by a first spectroscope through an optical fiber; a fiber collimator is arranged at the tail of the optical fiber to shape the light beam to ensure that the radiation signal can be fully transmitted to the spectroscope, thereby ensuring the accuracy of subsequent detection; the radiation signal after passing through the optical fiber collimator is divided into multiple radiation signals through multiple spectroscopes, and the multiple radiation signals are extracted through filters to obtain radiation signals of different wavelengths; Radiation signals of different wavelengths are linearly converted into voltage signals through photoelectric sensors; The single-point photoelectric colorimetric pyrometer is used to extract the radiation signal of a specific wavelength from the radiation signal of the object to be measured; the high-speed image sensor is used to extract the radiation signal of a specific wavelength of the pixel channel corresponding to the imaging surface, and convert the radiation signal into a voltage signal through the internal circuit of the system, and finally convert it into digital image data through the analog-to-digital conversion module; The single-point photoelectric colorimetric pyrometer and the high-speed image sensor can measure the radiation signal of the object to be measured at a specific wavelength after calibration; the colorimetric temperature measurement formula is used to convert the radiation signal of the specific wavelength in the radiation signal of the object to be measured extracted by the single-point photoelectric colorimetric pyrometer and the high-speed image sensor into the target temperature to be measured; thereby achieving high temporal and spatial resolution characterization of the combustion temperature of micro / nano fuel particles.

2. The temperature measurement device with high temporal and spatial resolution according to claim 1, characterized in that: The synchronous control module is a measurement system based on PXI bus type control, which collects the response voltage signal of the single-point photoelectric colorimetric pyrometer based on the PXI bus and completes analog-to-digital conversion.

3. The temperature measurement device with high temporal and spatial resolution according to claim 1, characterized in that: The optical filter is a narrow-band filter and a mirror frame.

4. The temperature measurement device with high temporal and spatial resolution according to claim 1, characterized in that: The high-speed image sensor is a high-speed CMOS camera or a high-speed CCD camera.

5. A calibration method for the temperature measuring device according to claim 1, characterized in that: The single-point photoelectric colorimetric pyrometer and the high-speed image sensor are calibrated offline with the same standard source to obtain the spectral response sensitivity or spectral response curve; after the offline calibration is completed, the single-point photoelectric colorimetric pyrometer and the high-speed image sensor are coupled; then the coupling device is calibrated online to obtain the single-point photoelectric colorimetric pyrometer coupling spectrum correction coefficient A1 and the high-speed image sensor coupling spectrum correction coefficient A2; the RGB three-channel measurement value of the high-speed image sensor, the response voltage of the single-point photoelectric colorimetric pyrometer, the single-point photoelectric colorimetric pyrometer coupling spectrum correction coefficient A1, the high-speed image sensor coupling spectrum correction coefficient A2, the spectral response curve obtained by offline calibration, the amplification factor curve, and the spectral response sensitivity are substituted into the colorimetric temperature measurement formula to obtain the single-point high-time resolution characterization of the combustion temperature T of the object to be measured and the two-dimensional spatial distribution characterization of the combustion temperature T of the object to be measured; the specific wavelength radiation signal of the target to be measured is correctly characterized; The colorimetric temperature measurement formula is: ; In the formula Indicates temperature, is the second radiation constant, , Represents different wavelengths, , Indicates the radiation intensity of radiation signals of different wavelengths.

6. The calibration method according to claim 5, characterized in that: The specific steps of offline calibration of the single-point photoelectric colorimetric pyrometer and the high-speed image sensor to obtain the spectral response sensitivity or spectral response curve are as follows: The single-point photoelectric colorimetric pyrometer or high-speed image sensor used in the actual measurement is successively fixed to the same position of the same standard source; the amplification factor of the gain module of the single-point photoelectric colorimetric pyrometer and the working parameters of the high-speed image sensor are set, and the standard source is heated to record the response voltage data of the single-point photoelectric colorimetric pyrometer and the image signal obtained by the high-speed image sensor; The offline calibration process of high-speed image sensors is as follows: The working temperature of the standard radiation source is set, and the standard source image is sampled using a fixed white balance curve and imaging parameters. After collecting image signals at each temperature point, the average measurement value of the RGB three channels at each temperature calibration point is obtained; the correction value at each temperature point can be obtained by comparing the measurement value at the temperature calibration point with the radiation intensity at three wavelengths of the theoretical standard source radiation; the spectral response curve of the high-speed image sensor can be obtained by performing the least squares fitting on the correction value at each temperature point; The offline calibration process of a single-point photoelectric colorimetric pyrometer is as follows: The response voltage signal of the single-point photoelectric colorimetric pyrometer is not only related to its spectral sensitivity, but also to the internal amplification circuit. Therefore, before calibrating the spectral sensitivity, a standard radiation source is used to calibrate the amplification factor of the internal amplification circuit to obtain the amplification factor curve, and the same amplification factor is used for calibration in the subsequent correction value calibration process. Set the working temperature of the standard radiation source, the control voltage and frequency of the single-point photoelectric colorimetric pyrometer, align the single-point photoelectric colorimetric pyrometer with the standard radiation source, continuously collect the response voltage value of the single-point photoelectric colorimetric pyrometer within the set time period, and perform average processing on the collected data to reduce the error; compare the response voltage obtained after the average processing with the theoretical radiation intensity to obtain the spectral response sensitivity at each temperature point.

7. The calibration method according to claim 5, characterized in that: The specific steps of online calibration of the coupled single-point photoelectric colorimetric pyrometer and the high-speed image sensor to obtain the coupled spectrum correction coefficient A1 of the single-point photoelectric colorimetric pyrometer and the coupled spectrum correction coefficient A2 of the high-speed image sensor are as follows: First, place the calibrated standard source on the imaging plane at the front end of the microscope objective lens, use the synchronous control system to control the single-point photoelectric colorimetric pyrometer and the high-speed image sensor to synchronously collect signals from the standard radiation source, and record the response voltage data of the single-point photoelectric colorimetric pyrometer. ; Process the image data captured by the high-speed image sensor, calculate the average value of the central area of ​​the standard radiation source target surface in the captured image, and obtain the average measurement value of the three channels of each pixel ; Then, the single-point photoelectric colorimetric pyrometer and the high-speed image sensor are directly aligned with the standard source, and the synchronous control system is used to control the single-point photoelectric colorimetric pyrometer and the high-speed image sensor for synchronous signal acquisition, and the response voltage data of the single-point photoelectric colorimetric pyrometer is recorded. The image data captured by the high-speed image sensor is averaged and the central area of ​​the standard radiation source target surface in the captured image is calculated to obtain the average measurement value of the three channels of each pixel. ; Finally, based on the recorded data, the single-point photoelectric colorimetric pyrometer coupled spectrum correction coefficient A1 and the high-speed image sensor coupled spectrum correction coefficient A2 are obtained.

8. The calibration method according to any one of claims 5 or 6, characterized in that: The standard radiation source described in the off-line calibration is a blackbody furnace.

9. The calibration method according to claim 7, characterized in that: The standard radiation source described in the online calibration is a standard tungsten halogen lamp.

10. Application of temperature measurement devices with high temporal and spatial resolution in the measurement of combustion temperature of micro / nano fuel particles.

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