A temperature measurement device with high temporal and spatial resolution, calibration method thereof and application thereof

Abstract

The present invention relates to a high-temporal-spatial-resolution temperature measurement device, its calibration method, and its application. By coupling a single-point photoelectric colorimetric pyrometer with a high-speed image sensor, a measurement device for measuring the combustion temperature of micro- / nano-fuel particles is proposed, and the device is applied to the measurement of the combustion temperature of micro- / nano-fuel particles. To ensure more accurate detection results, a calibration method is proposed. By using the same standard source for offline and online calibration of the single-point photoelectric colorimetric pyrometer and the high-speed image sensor camera, the effect of the coupled optical path on the spectral information of the radiation signal is corrected. After calibration, the specific wavelength radiation signal of the object to be measured can be accurately measured. A colorimetric temperature measurement formula is used to obtain a single-point high-temporal-resolution representation and a two-dimensional spatial distribution representation of the combustion temperature of the object to be measured, effectively solving the scientific problem of multi-dimensional high-temporal-spatial-resolution representation of the combustion temperature of micro- / nano-fuel particles.

Description

Technical Field

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

[0002] With the development of engine technology, hypersonic vehicles with high Mach number and wide-range requirements have attracted widespread attention. At high Mach numbers, liquid-fuel ramjets encounter 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 are gradually becoming a competitive alternative. Compared with liquid-fuel engines, solid-fuel engines offer high safety and stability during manufacturing, storage, and operation, as well as powerful flow regulation, re-ignition, and adjustable thrust capabilities. More importantly, solid fuel has low dissociation, ensuring complete energy release even at high Mach numbers.

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

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

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

[0006] In order to solve the problems existing in the existing fuel particle combustion temperature measurement technology, the present invention provides a temperature measurement device with high temporal and spatial resolution, a calibration method and application thereof;

[0007] The high-temporal-spatial-resolution temperature measurement device of the present invention includes a microscope objective, a spectroscope, two convex lenses, a single-point photoelectric colorimetric pyrometer, a high-speed image sensor, and a synchronization 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 from the object to be measured, and the first spectroscope is used to split the radiation signal from the object to be measured into two radiation signals. These two radiation signals are amplified and focused by the two convex lenses, one of which is transmitted to the single-point photoelectric colorimetric pyrometer and the other to the high-speed image sensor. By providing the convex lenses to amplify and focus light, the radiation signal from the objective is fully captured by the camera or the target surface of the photoelectric pyrometer, resulting in a clearer image.

[0008] The single-point photoelectric colorimetric pyrometer and the high-speed image sensor are both connected to the synchronization control module through lines, and the synchronization 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.

[0009] 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 the radiation signal of the object to be measured separated by the first spectroscope. A fiber collimator is set at the end 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 fiber collimator is divided into multiple radiation signals through multiple spectroscopes. The multiple radiation signals are extracted into radiation signals of different wavelengths through filters. The radiation signals of different wavelengths are linearly converted into voltage signals by photoelectric sensors.

[0010] 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.

[0011] After calibration, the single-point photoelectric colorimetric pyrometer and the high-speed image sensor can measure the radiation signal of the specific wavelength of the object to be measured; 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.

[0012] 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 analog-to-digital conversion.

[0013] Furthermore, the optical filter is a narrowband filter and a frame.

[0014] Preferably, the high-speed image sensor is a high-speed CMOS camera.

[0015] The calibration method of the above-mentioned temperature measurement device is as follows: a single-point photoelectric colorimetric pyrometer and a high-speed image sensor are offline calibrated using the same standard source to obtain a spectral response sensitivity or a spectral response curve; after completing the offline calibration, the single-point photoelectric colorimetric pyrometer and the high-speed image sensor are coupled; then the coupling device is online calibrated to obtain a coupled spectrum correction coefficient A1 of the single-point photoelectric colorimetric pyrometer and a coupled spectrum correction coefficient A2 of the high-speed image sensor; the RGB three-channel measurement values ​​of the high-speed image sensor, the response voltage of the single-point photoelectric colorimetric pyrometer, the coupled spectrum correction coefficient A1 of the single-point photoelectric colorimetric pyrometer, the coupled spectrum correction coefficient A2 of the high-speed image sensor, 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 a single-point high-time resolution representation of the combustion temperature T of the object to be measured and a 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.

[0016] The colorimetric temperature measurement formula is: Where Indicates temperature, is the second radiation constant, 、 Indicates different wavelengths, 、 Indicates the radiation intensity of radiation signals of different wavelengths.

[0017] 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:

[0018] The single-point photoelectric colorimetric pyrometer or high-speed image sensor used in the actual measurement was attached to the same standard radiation source at the same location. The gain factor of the single-point photoelectric colorimetric pyrometer and the operating parameters of the high-speed image sensor were set. The standard radiation source was heated, and the response voltage data of the single-point photoelectric colorimetric pyrometer and the image signal obtained by the high-speed image sensor were recorded.

[0019] The offline calibration process of high-speed image sensors is as follows:

[0020] The operating temperature of the standard radiation source is set, and images of the standard radiation source are captured using a fixed white balance curve and imaging parameters. After acquiring image signals at each temperature point, the average measurement value of the three RGB channels at each temperature calibration point is obtained. By comparing the measured values ​​at these temperature calibration points with the theoretical radiation intensity of the standard source at three wavelengths, the correction value at each temperature point is obtained. A least-squares fit of the correction values ​​at each temperature point is then performed to obtain the spectral response curve of the high-speed image sensor.

[0021] The offline calibration process of a single-point photoelectric colorimetric pyrometer is as follows:

[0022] 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 spectral sensitivity calibration, a standard radiation source is used to calibrate the amplification factor of the internal amplification circuit to obtain the amplification factor curve. The same amplification factor is then used in the subsequent correction value calibration process.

[0023] Set the operating temperature of the standard radiation source, the control voltage of the single-point photoelectric colorimetric pyrometer, and the response signal acquisition frequency. Aim the single-point photoelectric colorimetric pyrometer at the standard radiation source and continuously acquire the single-point photoelectric colorimetric pyrometer response voltage over the set period. Average the acquired data to reduce error. Comparing the averaged response voltage with the theoretical radiation intensity yields the spectral response sensitivity at each temperature point.

[0024] 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:

[0025] First, a calibrated standard radiation source is placed on the imaging plane at the front end of the microscope objective lens. A synchronous control system is used 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 .

[0026] Then, the single-point photoelectric colorimetric pyrometer and the high-speed image sensor are directly aligned with the standard radiation source. A synchronous control system is used to control the single-point photoelectric colorimetric pyrometer and the high-speed image sensor for synchronous signal acquisition and record the single-point photoelectric colorimetric pyrometer response voltage data. 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. .

[0027] Finally, based on the recorded data, the single-point photoelectric colorimetric pyrometer coupling spectrum correction coefficient A1 and the high-speed image sensor coupling spectrum correction coefficient A2 are obtained.

[0028] Preferably, the standard radiation source in the offline calibration is a black body furnace, and the standard radiation source in the online calibration is a standard tungsten halogen lamp.

[0029] The temperature measurement device with high temporal and spatial resolution is applied to the measurement of the combustion temperature of micro / nano fuel particles.

[0030] Because the combustion of micro- and nano-fuel particles is characterized by short duration, weak radiation signals, and large fluctuations in the fire radiation signal, traditional temperature measurement methods have difficulty accurately characterizing the complete combustion process of micro- and nano-fuel particles. This invention proposes a measurement device for measuring the combustion temperature of micro- and nano-fuel particles by coupling a single-point photoelectric colorimetric pyrometer with a high-speed image sensor, capable of achieving high temporal and spatial resolution characterization of the combustion temperature of micro- and nano-fuel particles. 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 (via the same blackbody furnace). After completing the offline calibration, the detection device must be calibrated online using the same standard source to correct for the impact of the coupled optical path on the spectral information of the radiation signal. After online calibration, a synchronous control system controls a high-speed image sensor to continuously capture flame images of the fuel particles being measured. The system also simultaneously acquires the response voltage signal from a single-point photoelectric colorimetric thermometer. Based on the online and offline calibration results, the flame image data is converted into a two-dimensional distribution of the radiation intensity of the target at a specific wavelength, and the response voltage signal from the photoelectric colorimetric thermometer is converted into the overall radiation intensity of the target at a specific wavelength. The two-dimensional temperature distribution of the target and a single-point time-temperature curve are then derived using the colorimetric temperature measurement formula. Simultaneously measuring the same fuel particle using a single-point photoelectric colorimetric pyrometer based on a photoelectric sensor and a two-dimensional spatially resolved colorimetric thermometer based on an image sensor effectively addresses the scientific challenge of characterizing the combustion temperature of micro- and nano-fuel particles in multiple dimensions with high spatiotemporal resolution. Compared to traditional temperature measurement methods, this system provides temperature data with higher temporal resolution and a two-dimensional temperature distribution of the fuel particles, enabling experimenters to analyze or simulate the combustion temperature evolution and combustion mechanism of fuel particles, thereby improving their combustion performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a block diagram of the overall structure of the device of the present invention;

[0033] Figure 2 for Figure 1 The overall structural block diagram of the single-point photoelectric colorimetric pyrometer;

[0034] Figure 3The 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 are shown;

[0035] Figure 4 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 1;

[0036] 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 are shown;

[0037] Figure 6 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 2;

[0038] 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;

[0039] Figure 8 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 3;

[0040] Figure 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 are shown;

[0041] Figure 10 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 4;

[0042] Figure 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 are shown;

[0043] Figure 12 This is a two-dimensional representation of the combustion temperature of the fuel particles to be tested measured by the high-speed CMOS camera in Application Example 5. DETAILED DESCRIPTION

[0044] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0045] 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 also includes the plural. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0046] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] like Figure 1 As shown, a temperature measurement device with high temporal and spatial resolution includes a microscope objective lens S1, a beam splitter S2, two convex lenses, a single-point photoelectric colorimetric pyrometer, a high-speed image sensor, and a synchronization control module. The microscope objective lens S1 and the first beam splitter S2 are located on the same axis. The microscope objective lens S1 is used to couple the radiation signal from the object to be measured, while the first beam splitter S2 is used to split the radiation signal from the object to be measured into two radiation signals. After being amplified and focused by two convex lenses (S3 / S4), the two radiation signals are transmitted one way to the single-point photoelectric colorimetric pyrometer and the other way to the high-speed image sensor. The convex lenses are used to amplify and focus light, ensuring that the radiation signal from the objective lens is fully captured by the camera or the target surface of the photoelectric pyrometer, resulting in clearer images.

[0048] The single-point photoelectric colorimetric pyrometer and the high-speed image sensor are both connected to the synchronization control module through lines, and the synchronization 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.

[0049] The synchronization control module is a PXI measurement system that can acquire the response voltage signal of a single-point photoelectric colorimetric pyrometer and perform analog-to-digital conversion based on the PXI bus. The PXI measurement system used in this embodiment is manufactured by Shanghai Jianyi Co., Ltd., with a PXI chassis model of PXIe-2313 and acquisition cards of PXIe-9813 and PXIe-5510.

[0050] like Figure 2As shown, 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 the radiation signal of the object to be measured separated by the first spectroscope. A fiber collimator is set at the end 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 fiber collimator is divided into multiple radiation signals by multiple spectroscopes. The multiple radiation signals are extracted into radiation signals of different wavelengths by filters. The radiation signals of different wavelengths are linearly converted into voltage signals by photoelectric sensors.

[0051] In this embodiment, the optical filter is a narrowband filter and a mirror frame, and the photoelectric sensor is a photomultiplier tube PMT module with a model number of H10722-20 produced by Hamamatsu Photonics Co., Ltd.

[0052] 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.

[0053] In this embodiment, three photoelectric sensors are taken as an example. Two optical splitters are provided to split the radiation signal after passing through the optical fiber collimator into three paths. The three radiation signals are filtered by filters and then enter the three photoelectric sensors for linear conversion.

[0054] 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, 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.

[0055] The high-speed CMOS camera is equipped with a Bayer filter on the front. The radiation signal from the fuel particles being tested is converted through the Bayer filter into a specific wavelength radiation signal, which is then transmitted to the photodiodes in the CMOS high-speed camera's pixel array. Each pixel's photodiode converts the received specific wavelength radiation signal into an electric charge. These charge signals are then read and amplified by row and column scanning circuits. Finally, an analog-to-digital converter converts the analog signal into a digital signal, extracting the specific wavelength radiation signal from the fuel particles being tested.

[0056] 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.

[0057] when When Planck's formula can be simplified to Wien's formula, the radiation intensity is: ;

[0058] Where, 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.

[0059] Based on Wien's law, the radiation signal of the object being measured is a function of temperature, wavelength, and emissivity. The industry often treats flame signals as gray bodies, meaning their emissivity is independent of wavelength. Therefore, the colorimetric temperature measurement formula can be derived from the radiation intensity at multiple different wavelengths: ; 、 Indicates different wavelengths.

[0060] Taking three channels as an example, the three-channel colorimetric temperature measurement formula is: Where 、 、 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 can be calculated by correctly characterizing the specific wavelength radiation intensity of the target.

[0061] 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 of the same radiation intensity but different wavelengths, the response voltage signal of the single-point photoelectric colorimetric pyrometer and the pixel channel response value of the high-speed CMOS camera are different. 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 using the same standard radiation source (using the same blackbody furnace) before use to obtain the spectral response sensitivity or spectral response curve. The specific steps are as follows:

[0062] The single-point photoelectric colorimetric pyrometer or high-speed CMOS camera used in the actual measurement is fixed to the blackbody furnace at an appropriate distance, and both are aligned with the blackbody furnace target surface. The reason for using a blackbody furnace as the target to be measured is that the blackbody furnace is a standard radiation source that can generate a blackbody radiation signal at a specific temperature.

[0063] The gain module amplification factor of the single-point photoelectric colorimetric pyrometer and the operating parameters of the high-speed CMOS camera were set. The blackbody furnace was heated and the temperature was controlled between 800°C and 3000°C. The single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera were calibrated using the blackbody furnace. The response voltage data of the single-point photoelectric colorimetric pyrometer and the image signal obtained by the high-speed CMOS camera were recorded.

[0064] 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.

[0065] The offline calibration process of a high-speed CMOS camera is as follows:

[0066] The blackbody furnace operating temperature is set to gradually increase from 800°C to 3000°C in steps of 100°C. The blackbody furnace target surface image is sampled using a fixed white balance curve and imaging parameters. After collecting image signals at each temperature point, the center area of ​​the blackbody furnace target surface is selected to calculate the average value and obtain the average measurement value of the RGB three channels at each temperature calibration point. 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 this temperature calibration point. By comparison, the correction value Kt at each temperature point can be obtained. ;

[0067] Where, T is the real-time temperature of the blackbody furnace, The wavelength measured at the center of the R, G, and B pixel channels of the camera. 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 RGB measurement values ​​of the camera can accurately represent 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: .

[0068] The offline calibration process of a single-point photoelectric colorimetric pyrometer is as follows:

[0069] Compared to 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 spectral sensitivity calibration, the amplification factor of the internal amplification circuit should be calibrated using a blackbody furnace. The same amplification factor should be used for subsequent correction value calibration.

[0070] First, the temperature of the blackbody furnace is set to 1000 degrees Celsius, and the three-channel photomultiplier tube control voltage is set from 0.5V, stepping 1mV to measure the blackbody furnace radiation signal, and a series of response voltage values ​​are obtained. , the least squares fitting of the series of response voltage values ​​is performed to obtain the three-channel photomultiplier tube amplification factor curve .

[0071] Then, set the blackbody furnace temperature to Tb, which is any temperature between 800℃ and 3000℃; use a single-point photoelectric colorimetric pyrometer to align with the blackbody furnace target surface, set the three-channel control voltage to 0.5V, control the synchronous trigger control module to continuously collect the three-channel photoelectric sensor response voltage value of the single-point photoelectric colorimetric pyrometer at a sampling frequency of 10Khz for 5s, and perform average processing on the collected data to reduce the error. The three-photomultiplier tube response voltage obtained after average processing is 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 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: ;

[0072] Where, 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 accurately 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:

[0073] 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 .

[0074] 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:

[0075] First, place a calibrated standard halogen tungsten lamp on the imaging plane in 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 synchronize 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 .

[0076] 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 synchronous control system is used to control the single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera for synchronous signal acquisition and record the single-point photoelectric colorimetric pyrometer response voltage data. 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. .

[0077] Finally, based on the recorded data, the single-point photoelectric colorimetric pyrometer coupling spectrum correction coefficient A1 and the CMOS camera coupling spectrum correction coefficient A2 are obtained. 1、 The expression in A2 is as follows:

[0078] ; .

[0079] 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;

[0080] The single-point high time resolution characterization of the combustion temperature T of the object to be measured is obtained as:

[0081] 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 ;

[0082] Where, 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.

[0083] The two-dimensional spatial distribution of the combustion temperature T of the object to be measured is characterized as follows:

[0084] ;

[0085] Where 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.

[0086] After calibration, the single-point photoelectric colorimetric pyrometer and high-speed CMOS camera can accurately characterize the radiation signal of the specific wavelength of the object to be measured. 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 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.

[0087] Common powdered fuels used in solid fuel engines include aluminum, magnesium, boron, and composite fuels. The device and method described above were applied in the following application example. The microscope objective used in this application example has a magnification of 20× and a spatial resolution of 0.75 μm. Temporal resolution can be determined by the high-speed CMOS camera frame rate, exposure time, photomultiplier tube, and sampling rate, reaching the μs level. Because the combustion radiation intensity of different micro- and nano-fuel particles to be tested varies, the control voltage and exposure time should be appropriately set during the test to ensure that the radiation signal intensity is within the response threshold of the single-point photoelectric colorimetric pyrometer and the high-speed CMOS camera.

[0088] Application Example 1

[0089] A single micro / nano fuel particle is used for combustion testing. The images captured 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. Ultimately, a two-dimensional distribution video of the combustion temperature of the single fuel particle and a time-temperature curve with high temporal resolution are obtained.

[0090] In this example, the high-speed CMOS camera's exposure time was adjusted to 99 μs, the frame rate to 10,000 fps, and the resolution to 512 × 512. The single-point photoelectric colorimetric pyrometer sampling rate was set to 1,000,000 Hz, and the amplification gain module was set to 1. The fuel particle to be tested was a single micron aluminum particle with an equivalent particle size of 15.3 μm.

[0091] The single-point photoelectric colorimetric pyrometer couples the radiation signal through an optical fiber. It has an internal narrowband filter and a photomultiplier tube that can convert the radiation intensity of a specific wavelength into a voltage signal. The specific measurement steps are as follows:

[0092] Step 1: After completing the offline 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 lens of the temperature measurement device.

[0093] 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 capture images, and the single-point photoelectric colorimetric pyrometer sensor to collect the response signal.

[0094] Step 3: The images taken by the high-speed CMOS camera and the response signal of the single-point photoelectric colorimetric pyrometer sensor are converted into the radiation intensity of the specific wavelength of the combustion of the particles to be tested. The high-speed CMOS camera obtains the two-dimensional representation of the combustion temperature of the fuel particles to be tested 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 shown).

[0095] Figure 3 The dashed line represents the actual measurement process where the radiation signal intensity exceeds the threshold of the high-speed CMOS camera sensor, resulting in inaccurate data. However, the single-point photoelectric colorimetric pyrometer is still able to measure the radiation signal of the target. In this case, the single-point photoelectric colorimetric pyrometer serves as a temporal supplement to the data measured by the high-speed CMOS camera, improving the temperature characterization integrity of the system.

[0096] Application Example 2

[0097] In this example, the high-speed CMOS camera's exposure time was adjusted to 90 μs, the frame rate to 11,000 fps, and the resolution to 512×512. The single-point photoelectric colorimetric pyrometer's sampling rate was set to 1,000,000 Hz, and the amplifier gain module was set to 1. The fuel particles to be tested were nano-aluminum, with a nominal particle size of 100 nm and an equivalent cluster size of 56.6 μm. The specific steps for measuring the combustion temperature of nano-aluminum are as follows:

[0098] 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 lens of the temperature measurement device.

[0099] 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.

[0100] Step 3: The images taken by the high-speed CMOS camera and the response signal of the single-point photoelectric colorimetric pyrometer sensor are converted into the radiation intensity of the specific wavelength of the combustion of the particles to be tested. The CMOS camera obtains the two-dimensional representation of the combustion temperature of the fuel particles to be tested 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 5As 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 shown).

[0101] from Figure 5 It can be observed that the temperature data measured by the two methods have good trend consistency. Compared with the data measured by the high-speed CMOS camera, the single-point photoelectric colorimetric pyrometer has a higher temperature measurement resolution on the time scale, while the high-speed CMOS camera can achieve 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.

[0102] Application Example 3

[0103] In this example, the high-speed CMOS camera's exposure time was adjusted to 5 μs, the frame rate to 10,000 fps, and the resolution to 512×512. The single-point photoelectric colorimetric pyrometer sampling rate was set to 1,000,000 Hz, and the amplification gain module was set to 1. The fuel particles to be tested were micronized magnesium, with an equivalent particle size of 68.0 μm. The specific steps for measuring the combustion temperature of micronized magnesium are as follows:

[0104] Step 1: After completing the offline and online calibration of the device, place the single fuel to be tested on the imaging surface of the microscope objective lens of the temperature measurement device.

[0105] 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.

[0106] Step 3: The images taken by the high-speed CMOS camera and the response signal of the single-point photoelectric colorimetric pyrometer sensor are converted into the radiation intensity of the specific wavelength of the combustion of the particles to be tested. The CMOS camera obtains the two-dimensional representation of the combustion temperature of the fuel particles to be tested 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 shown).

[0107] Due to the extremely short combustion time, the high-speed CMOS camera can only capture 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.

[0108] Application Example 4

[0109] In this example, the high-speed CMOS camera's exposure time was adjusted to 50 μs, the frame rate was set to 10,000 fps, and the resolution was 512×512. The single-point photoelectric colorimetric pyrometer's sampling rate was set to 1,000,000 Hz, and the amplification gain module was set to 1. The fuel particles to be tested were boron carbide, with an equivalent particle size of 10.9 μm. The specific steps for determining the combustion temperature of boron carbide were as follows:

[0110] 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 lens of the temperature measurement device.

[0111] 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.

[0112] Step 3: The images taken by the high-speed CMOS camera and the response signal of the single-point photoelectric colorimetric pyrometer sensor are converted into the radiation intensity of the specific wavelength of the combustion of the particles to be tested. The CMOS camera obtains the two-dimensional representation of the combustion temperature of the fuel particles to be tested through the colorimetric temperature measurement formula (such as Figure 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) Figure 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). Figure 9 shown).

[0113] from Figure 9 It 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 capability of the high-speed CMOS camera is weaker than that of the single-point photoelectric colorimetric pyrometer, the response signal measured by it 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.

[0114] Application Example 5

[0115] In this example, the high-speed CMOS camera exposure time was adjusted to 99 μs, the frame rate was 10,000 fps, and the resolution was 512×512. The single-point photoelectric colorimetric pyrometer sampling rate was set to 1,000,000 Hz, and the amplification gain module was set to 1. The fuel particles to be tested were amorphous boron, with a nominal particle size of 100 nm and an equivalent cluster size of 88.0 μm. The specific steps for determining the combustion temperature of amorphous boron were as follows:

[0116] 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 lens of the temperature measurement device.

[0117] 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.

[0118] Step 3: The images taken by the high-speed CMOS camera and the response signal of the single-point photoelectric colorimetric pyrometer sensor are converted into the radiation intensity of the specific wavelength of the combustion of the particles to be tested. The CMOS camera obtains the two-dimensional representation of the combustion temperature of the fuel particles to be tested through the colorimetric temperature measurement formula (such as Figure 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) Figure 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). Figure 11 shown).

[0119] Application Examples 1 through 5 above demonstrate the complete single-point temporal temperature measurement and two-dimensional distribution characterization of the combustion temperature of various micro- and nano-fuel particles (such as aluminum, magnesium, and boron) 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 with a two-dimensional spatially resolved colorimetric pyrometer based on an image sensor, the two complement each other in both temporal and spatial resolution, enhancing the system's overall temperature characterization capabilities.

Claims

1. A temperature measurement device with high temporal and spatial resolution, characterized by: The device includes a microscope objective lens, a spectroscope, two convex lenses, a single-point photoelectric colorimetric pyrometer, a high-speed image sensor, and a synchronization control module. The microscope objective lens and the first spectroscope are located on the same axis. The microscope objective lens is used to couple the radiation signal of the object to be measured, and the first spectroscope is used to split the radiation signal of the object to be measured into two radiation signals. The two radiation signals are amplified and focused by the two convex lenses, and one 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 synchronization control module through a line, and the synchronization 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, a fiber collimator, multiple spectroscopes, filters, and multiple photoelectric sensors. It receives a radiation signal from the object under test, which is split by the first spectroscope, through the optical fiber. A fiber collimator is installed at the end of the optical fiber to shape the beam, ensuring 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 fiber collimator is split into multiple radiation signals through multiple spectroscopes. The multiple radiation signals are then filtered to extract 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 from the pixel channel corresponding to the imaging surface, and the radiation signal is converted into a voltage signal through the internal circuit of the system, and finally converted into digital image data through the analog-to-digital conversion module; After calibration, the single-point photoelectric colorimetric pyrometer and the high-speed image sensor can measure the radiation signal of the specific wavelength of the object to be measured; 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, wherein: 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, wherein: 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, wherein: 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 offline calibrated using the same standard source to obtain a spectral response sensitivity or a spectral response curve; after completing the offline calibration, the single-point photoelectric colorimetric pyrometer and the high-speed image sensor are coupled; the coupling device is then calibrated online to obtain a coupled spectrum correction coefficient A1 of the single-point photoelectric colorimetric pyrometer and a coupled spectrum correction coefficient A2 of the high-speed image sensor; the RGB three-channel measurement values ​​of the high-speed image sensor, the response voltage of the single-point photoelectric colorimetric pyrometer, the coupled spectrum correction coefficient A1 of the single-point photoelectric colorimetric pyrometer, the coupled spectrum correction coefficient A2 of the high-speed image sensor, the spectral response curve, the amplification factor curve, and the spectral response sensitivity obtained by offline calibration are substituted into the colorimetric temperature measurement formula to obtain a single-point high-time resolution representation of the combustion temperature T of the object to be measured and a 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; The colorimetric temperature measurement formula is: Where Indicates temperature, is the second radiation constant, 、 Indicates different wavelengths, 、 Indicates the radiation intensity of radiation signals of different wavelengths.

6. The calibration method according to claim 5, wherein: 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 single-point photoelectric colorimetric pyrometer gain module and the operating 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 operating 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. By comparing the measured value at this temperature calibration point with the radiation intensity of the theoretical standard source radiation at three wavelengths, the correction value at each temperature point can be obtained. After performing a least squares fit on the correction value at each temperature point, the spectral response curve of the high-speed image sensor can be obtained. 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. The same amplification factor is then used in the subsequent correction value calibration process. Set the operating 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 values ​​of the single-point photoelectric colorimetric pyrometer within the set time period, and perform average processing on the collected data to reduce the error; the response voltage obtained after the average processing is compared with the theoretical radiation intensity to obtain the spectral response sensitivity at each temperature point.

7. The calibration method according to claim 5, wherein: The specific steps of online calibration of the coupled single-point photoelectric colorimetric pyrometer and the high-speed image sensor to obtain the single-point photoelectric colorimetric pyrometer coupled spectrum correction coefficient A1 and the high-speed image sensor coupled spectrum correction coefficient A2 are as follows: First, place the calibrated standard source on the imaging plane at the front 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. A synchronous control system is used to control the single-point photoelectric colorimetric pyrometer and the high-speed image sensor for synchronous signal acquisition and record the single-point photoelectric colorimetric pyrometer response voltage data. 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 coupling spectrum correction coefficient A1 and the high-speed image sensor coupling spectrum correction coefficient A2 are obtained.

8. The calibration method according to any one of claims 5 or 6, wherein: The standard radiation source described in the offline calibration is a blackbody furnace.

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

10. Use of the temperature measurement device with high temporal and spatial resolution according to claim 1 in measuring the combustion temperature of micro / nano fuel particles.

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