Device and method for self-checking and calibration coefficient correction of a radiation pyrometer system

Abstract

This invention discloses a device and method for self-testing and calibration coefficient correction of a radiation pyrometer system, relating to the field of radiation temperature measurement technology. The device comprises a broadband light source, an intensity modulation unit, a first multimode fiber, a return light unit, a second multimode fiber, and a multichannel radiation pyrometer. The return light unit shares the second multimode fiber with the object under test, ensuring that the transmission path of the return light monitoring signal is consistent with that of the radiation signal under test. The method includes system self-testing and calibration coefficient correction: Transmission link loss is calculated by comparing the return light amplitude of the reference and actual states, achieving system status self-testing and abnormal channel location; initial calibration coefficients are calculated based on standard temperature source measurements combined with Planck's radiation law, and then the transmission loss factor is calculated through changes in the return light signal amplitude to dynamically correct the calibration coefficients; finally, the spectral radiance is calculated using the corrected coefficients, and the impact temperature to be measured is obtained through least squares fitting. This invention enables rapid system self-testing and dynamic coefficient correction.

Description

Technical Field

[0001] This invention relates to the field of radiation thermometry, specifically to a device and method for self-testing and calibration coefficient correction of a radiation pyrometer system. Background Technology

[0002] Accurate measurement of shock temperature is an extremely challenging task in experimental research and is one of the problems that has not yet been well solved in the experimental study of shock wave physics and equations of state.

[0003] Current shock temperature measurements primarily employ multi-channel radiation pyrometer systems. The working principle is as follows: the radiation signal is transmitted through the optical transmission unit to the radiation pyrometer, where it is split into different bands by a beam splitter. The signal is then coupled to a photodetector via an optical path adjustment module, converting the optical signal into an electrical signal. Finally, the data acquisition unit records and stores the signal. A standard temperature source is used to calibrate the coefficients of each band (detection channel) of the system, converting the electrical signal into a spectral radiance signal. The measured temperature is then calculated using Planck's law of radiation.

[0004] In some temperature measurement scenarios, the object under test and the radiation pyrometer system are tens or even hundreds of meters apart. To achieve long-distance transmission of radiation signals, multimode fiber is generally used as the optical path transmission unit to connect the pyrometer system and the object under test. The core material of multimode fiber is quartz, which is easily broken and damaged. Furthermore, when multiple multimode fibers are used to form a long-distance transmission link, flanges are required for fiber optic connections. These flange connections are prone to loosening, causing the optical path to be interrupted. Since the radiation pyrometer is a passive measurement system, it is currently impossible to perform a system status check before the experiment. If a fiber breaks or the flange connection loosens, resulting in damage to the optical path transmission unit, the radiation pyrometer will not be able to obtain the experimental signal, leading to experimental failure. Therefore, this problem urgently needs to be solved.

[0005] Furthermore, after calibrating the radiation pyrometer using a standard temperature source, the pyrometer may be moved or transported, causing changes in the relative positions of the internal spectral splitting mechanism and optical path adjustment module. At the same time, the multimode fiber may be bent or replaced, resulting in changes in the optical path transmission efficiency and altering the calibration coefficients of each channel. Using the initial calibration coefficients for temperature fitting will lead to large temperature errors and invalid experimental data. Therefore, it is necessary to correct the calibration coefficients of each channel in real time.

[0006] In summary, for traditional radiation pyrometers, it is necessary to establish a technique for checking the working status of the radiation pyrometer, monitoring transmission loss, and correcting the calibration coefficient caused by loss during the experimental implementation process. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a device and method for self-testing and calibration coefficient correction of a radiation pyrometer system, thereby enabling rapid system self-testing and dynamic coefficient correction, and improving temperature measurement accuracy and experimental success rate.

[0008] To achieve the above objectives, the embodiments of this invention provide the following technical solutions:

[0009] This application provides a device for self-testing and calibration coefficient correction of a radiation pyrometer system, comprising: a broadband light source, an intensity modulation unit, a first multimode fiber, a return probe, a second multimode fiber, and a radiation pyrometer; the emitted light signal from the broadband light source is incident on the intensity modulation unit, and after intensity modulation, coupled to the input end of the first multimode fiber; the output end of the first multimode fiber is connected to the incident port of the return probe, for transmitting the modulated light signal to the return probe; the reflection port of the return probe is connected to the input end of the second multimode fiber, for reflecting a portion of the light signal back to the second multimode fiber; the output end of the second multimode fiber is connected to the input port of the radiation pyrometer, for transmitting the reflected light signal to the radiation pyrometer; the radiation pyrometer includes multiple detection channels for receiving and recording the reflected light signal.

[0010] Furthermore, the broadband light source has a spectral width range of 400-1700nm, a color temperature of 5000K, and an output light power intensity stability better than 1%. The spectral width range covers the working spectral width of each detection channel of the radiation pyrometer.

[0011] Furthermore, the transmittance of the backlight probe is not less than 90% and the reflectance is not less than 5% within the working spectral width range of each detection channel of the radiation pyrometer.

[0012] Accordingly, this application also provides a method for self-testing a radiation pyrometer system, comprising the following steps: connecting a first multimode fiber and a second multimode fiber to the reflection port of the return probe and the input port of the radiation pyrometer, respectively; turning on a broadband light source, and after intensity modulation, transmitting the optical signal to the return probe through the first multimode fiber; the reflected light then returns through the second multimode fiber and enters the radiation pyrometer; measuring the amplitude of the return signal of each detection channel, and recording it as... , where i represents the i-th detection channel; after the actual temperature measurement system is built, multiple multimode optical fibers are used to connect the reflection port of the return probe and the input port of the radiation pyrometer, the broadband light source is turned on again, the amplitude of the return signal of each detection channel is measured, and recorded as . ;based on and Calculate the transmission link loss of each detection channel. Its formula is expressed as: The criterion for a normal state is set as follows: If the loss is less than 50%, if a certain detection channel's If the percentage is greater than or equal to 50%, the detection channel is considered to be in an abnormal state.

[0013] Accordingly, this application also provides a method for correcting the calibration coefficients of a radiation pyrometer system, comprising the following steps: placing a standard temperature source at the location of the object to be measured, transmitting the radiation signal of the standard temperature source to the radiation pyrometer via a second multimode optical fiber, measuring the output amplitude of each detection channel under the illumination of the standard temperature source, and recording it as... And the temperature value of the standard temperature source is denoted as The spectral radiance of a standard temperature source is calculated using Planck's law of radiation, and the formula is expressed as follows: ,in This represents the emissivity of a standard temperature source. , , Let represent the first radiation constant and the second radiation constant, respectively. The center wavelength of the i-th detection channel is... Spectral radiance; based on the formula The initial calibration coefficients for each detection channel are calculated using the following formula: After calibration, keeping the temperature measurement system unchanged, turn on the broadband light source and measure the amplitude of the reflected light signal of each detection channel under the illumination of the broadband light source, and record it as follows: Before the experiment, the broadband light source was turned on again, and the amplitude of the reflected light signal of each detection channel under the illumination of the broadband light source was measured and recorded as follows. The calculation of the transmission loss factor caused by changes in the transmission link after calibration is expressed by the following formula: Based on formula Revise the calibration coefficients.

[0014] Furthermore, during the impact test, the radiation signal of the object under test is transmitted to the radiation pyrometer via the second multimode fiber to measure the output amplitude of each detection channel. Then, the spectral radiance of each channel is calculated using the revised calibration coefficient. Finally, the temperature to be measured is obtained by fitting the data using Planck's radiation law and the least squares method.

[0015] Furthermore, the backlight probe and the object under test share the second multimode fiber as a transmission link to ensure that the transmission paths of the backlight detection signal and the radiation signal under test are completely consistent.

[0016] The beneficial effects of this invention are as follows: By constructing a complete self-testing and correction device, the structural characteristics of the multi-channel radiation pyrometer and the optical path connection relationship of each component are clarified, filling the gap in active self-testing devices for radiation pyrometers. The backlight monitoring signal and the temperature measurement radiation signal share a transmission link, ensuring that the monitoring data accurately reflects the temperature measurement link status. Furthermore, integrating self-testing and coefficient correction into the same device simplifies the temperature measurement system structure and reduces operation and maintenance costs. Attached Figure Description

[0017] Figure 1 A schematic diagram of a device for self-testing and calibration coefficient correction of a radiation pyrometer system provided in this application embodiment;

[0018] Figure 2 A flowchart illustrating a self-testing method for a radiation pyrometer system is also provided for embodiments of this application;

[0019] Figure 3 This application also provides a flowchart illustrating a method for correcting the calibration coefficients of a radiation pyrometer system.

[0020] Figure labels: 1-Broadband light source, 2-Intensity modulation unit, 3-First multimode fiber, 4-Return probe, 5-Second multimode fiber, 6-Radiation pyrometer. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0022] In this invention, the terms "system" and "network" are used interchangeably. "Multiple" refers to two or more; therefore, in this invention, "multiple" can also be understood as "at least two." "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, it should be understood that in the description of this invention, terms such as "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or order.

[0023] If the monitoring signal and the temperature measurement signal use different transmission links, the actual loss of the temperature measurement link cannot be accurately reflected, and effective data cannot be provided for calibration coefficient correction.

[0024] like Figure 1As shown in the figure, this application provides a device for system self-testing and calibration coefficient correction of a radiation pyrometer 6, including: a broadband light source 1, an intensity modulation unit 2, a first multimode fiber 3, a return probe 4, a second multimode fiber 5, and a radiation pyrometer 6; the emitted light signal from the broadband light source 1 is incident on the intensity modulation unit 2, and after intensity modulation, is coupled to the input end of the first multimode fiber 3; the output end of the first multimode fiber 3 is connected to the incident port of the return probe 4, for transmitting the modulated light signal to the return probe 4; the reflection port of the return probe 4 is connected to the input end of the second multimode fiber 5, for reflecting part of the light signal back to the second multimode fiber 5; the output end of the second multimode fiber 5 is connected to the input port of the radiation pyrometer 6, for transmitting the reflected light signal to the radiation pyrometer 6; the radiation pyrometer 6 includes multiple detection channels for receiving and recording the reflected light signal.

[0025] In another possible embodiment, a device is constructed consisting of a broadband light source 1, an intensity modulation unit 2, a first multimode fiber 3, a return probe 4, a second multimode fiber 5, and a radiation pyrometer 6. The radiation pyrometer 6 has multiple independent detection channels, each corresponding to a different detection band. The components are connected in a fixed optical path sequence. The emitted light signal from the broadband light source 1 is first incident on the intensity modulation unit 2, and after intensity modulation, coupled to the input end of the first multimode fiber 3. The output end of the first multimode fiber 3 is connected to the incident port of the return probe 4, transmitting the modulated light signal to the return unit. The reflection port of the return unit is connected to the input end of the second multimode fiber 5, reflecting part of the light signal back to the second multimode fiber 5. The output end of the second multimode fiber 5 is connected to the input port of the radiation pyrometer 6, transmitting the reflected light signal to the radiation pyrometer 6. The multiple detection channels of the radiation pyrometer 6 receive and record the reflected light signal, while the radiation signal of the object under test can be transmitted through the return unit and the second multimode fiber 5 to the radiation pyrometer 6, achieving complete consistency between the two signal transmission paths.

[0026] By constructing a complete self-testing and correction device, the structural characteristics of the multi-channel radiation pyrometer 6 and the optical path connection relationship of each component were clarified, filling the gap in the active self-testing device of the radiation pyrometer 6. The backlight monitoring signal and the temperature measurement radiation signal share a transmission link, ensuring that the monitoring data can accurately reflect the status of the temperature measurement link. Furthermore, the self-testing and coefficient correction are integrated into the same device, simplifying the structure of the temperature measurement system and reducing operation and maintenance costs.

[0027] In this embodiment of the application, the broadband light source has a spectral width range of 400-1700nm, a color temperature of 5000K, and an output light power intensity stability better than 1%. The spectral width range covers the working spectral width of each detection channel of the radiation pyrometer.

[0028] In another possible embodiment, a broadband light source with a spectral width of 400-1700nm, a color temperature of 5000K, and an output light power intensity stability better than 1% is selected as the self-test reference light source. After being turned on, the light intensity is maintained by a built-in light stabilization module, and the color temperature is precisely stabilized at 5000K by a color temperature calibration component to ensure the stability and consistency of the light source's output spectrum. The output port of the broadband light source 1, after debugging, is precisely coupled to the input port of the intensity modulation unit 2 to ensure that the light signal enters the intensity modulation unit 2 efficiently without significant light leakage, providing clear and stable return light monitoring signals for subsequent channels. Moreover, its spectral width can completely cover the working spectral width of each detection channel of the radiation pyrometer, ensuring that each channel can receive an effective monitoring light signal.

[0029] In this embodiment of the application, the transmittance of the backlight probe is not less than 90% and the reflectance is not less than 5% within the working spectral width range of each detection channel of the radiation pyrometer.

[0030] In another possible embodiment, an optical element with a transmittance of over 90% and a reflectance of over 5% in the 400-1700nm working band is selected as the backlight probe 4. First, its transmittance and reflectance are detected throughout the entire working spectrum to ensure that the requirements are met. Then, the output end of the first multimode fiber 3 is precisely coupled to the incident port of the backlight probe 4, so that all the modulated optical signal is reflected to the backlight unit. Then, the input end of the second multimode fiber 5 is precisely coupled to the reflection port of the backlight probe 4, so that the reflected backlight signal enters the second multimode fiber 5 efficiently. At the same time, the transmission port of the backlight probe 4 is oriented towards the object under test to ensure that the radiation signal under test can be incident vertically to the transmission port without obstruction and smoothly pass through the backlight probe 4 into the second multimode fiber 5. This realizes the optical path integration of the backlight detection signal and the temperature measurement radiation signal, and maintains stable transmission and reflection performance throughout the entire working spectrum.

[0031] Traditional radiation pyrometer 6 systems lack standardized self-testing procedures and quantitative status criteria, making it impossible to quantitatively calculate the transmission link loss of each channel. Anomalies can only be detected after an experiment fails, and the abnormal channel cannot be quickly located, making the troubleshooting process time-consuming and laborious.

[0032] like Figure 2 As shown in the embodiment of this application, a method for self-testing a radiation pyrometer 6 system is also provided, comprising the following steps: connecting a first multimode fiber 3 and a second multimode fiber 5 to the reflection port of the return probe 4 and the input port of the radiation pyrometer 6, respectively; turning on the broadband light source 1, and after intensity modulation, transmitting the optical signal to the return probe 4 through the first multimode fiber 3, the reflected light returning through the second multimode fiber 5 and entering the radiation pyrometer 6, measuring the amplitude of the return signal of each detection channel, and recording it as... , where i represents the i-th detection channel; after the actual temperature measurement system is built, multiple multimode optical fibers are used to connect the reflection port of the return light probe 4 and the input port of the radiation pyrometer 6, the broadband light source 1 is turned on again, the amplitude of the return light signal of each detection channel is measured, and recorded as . ;based on and Calculate the transmission link loss of each detection channel. Its formula is expressed as: The criterion for a normal state is set as follows: If the loss is less than 50%, if a certain detection channel's If the percentage is greater than or equal to 50%, the detection channel is considered to be in an abnormal state.

[0033] In another possible embodiment, a single, unbroken, unbent, and flange-free complete multimode optical fiber (i.e., the first multimode fiber 3 and the second multimode fiber 5) is first used to replace the actual optical path transmission unit for temperature measurement. After being connected to the device, the broadband light source 1 is turned on, and the amplitude of the reflected light signal from the i-th detection channel of the radiation pyrometer 6 is measured and recorded. After completing the measurements of all detection channels, the actual temperature measurement system was built, connected to the multimode fiber optic link of the flange connection, and with other components remaining unchanged, the broadband light source 1 was turned on to measure and record the amplitude of the return signal of the i-th detection channel. And complete all detection channel measurements, according to the formula Calculate the transmission link loss for each probe channel. The system status is determined and abnormal channels are located by using a transmission link loss of less than 50% as a normal criterion.

[0034] By introducing a complete multimode optical fiber as a measurement benchmark, the quantitative calculation of the transmission link loss of each detection channel can be realized, transforming the system status judgment from qualitative to quantitative, improving the accuracy of self-test results, and allowing independent loss calculation for each detection channel to achieve accurate and rapid location of abnormal detection channels. Furthermore, the self-test is completed by the device itself and can be performed quickly before the experiment, avoiding the problem of experimental failure due to system malfunction.

[0035] Traditional calibration methods require recalibration using a standard temperature source before each experiment, which is complex and time-consuming. Furthermore, the original calibration coefficients become inapplicable after changes in fiber optic transmission link loss, leading to deviations in temperature measurement results and making dynamic correction impossible.

[0036] like Figure 3 As shown in the embodiment of this application, a method for correcting the calibration coefficient of a radiation pyrometer 6 system is also provided, including the following steps: placing a standard temperature source at the location of the object to be measured, transmitting the radiation signal of the standard temperature source to the radiation pyrometer 6 via a second multimode optical fiber 5, measuring the output amplitude of each detection channel under the illumination of the standard temperature source, and recording it as... And the temperature value of the standard temperature source is denoted as The spectral radiance of a standard temperature source is calculated using Planck's law of radiation, and the formula is expressed as follows: ,in This represents the emissivity of a standard temperature source. , , Let represent the first radiation constant and the second radiation constant, respectively. The center wavelength of the i-th detection channel is... Spectral radiance; based on the formula The initial calibration coefficients for each detection channel are calculated using the following formula: After calibration, keeping the temperature measurement system unchanged, turn on broadband light source 1, measure the amplitude of the reflected light signal of each detection channel under the illumination of broadband light source 1, and record it as follows: Before the experiment, the broadband light source 1 was turned on again, and the amplitude of the reflected light signal of each detection channel under the illumination of the broadband light source 1 was measured and recorded as follows. The calculation of the transmission loss factor caused by changes in the transmission link after calibration is expressed by the following formula: Based on formula Revise the calibration coefficients.

[0037] In another possible embodiment, after confirming that the system self-test is qualified, a calibration coefficient correction step is performed. First, a standard temperature source (such as a blackbody source with an emissivity of 1 and a fixed temperature value) is placed at the location of the object to be measured. The radiation signal from the standard temperature source is transmitted to the radiation pyrometer 6 via the second multimode fiber optic cable 5. The output amplitude of each detection channel under the illumination of the standard temperature source is measured and recorded as follows. Next, the spectral radiance of the standard temperature source in the i-th detection channel is calculated according to Planck's radiation law, using the formula: ,in This represents the emissivity of a standard temperature source. , , Let represent the first and second radiation constants, respectively; be the center wavelength of the i-th detection channel; and be the spectral radiance. Then, based on the formula... Calculate the initial calibration coefficients and derive the results. After calibration, keeping the temperature measurement system in the same state, turn on broadband light source 1 and measure the amplitude of the reflected light signal of each detection channel, recording it as... Finally, the transmission loss factor is calculated. And based on the formula Revise the calibration coefficients to obtain new calibration coefficients that are adapted to the current link state.

[0038] First, by making the system's self-test pass a prerequisite for calibration correction, the effectiveness of calibration and correction is ensured from the source, avoiding invalid operations. Second, based on Planck's radiation law, a quantitative correlation between spectral radiance and output amplitude is established, providing a rigorous theoretical basis for the calculation of initial calibration coefficients and improving coefficient accuracy. Finally, by calculating the transmission loss factor through two backlight amplitude measurements, changes in the link after calibration can be accurately captured, providing reliable data for dynamic correction without the need for frequent recalibration using a standard temperature source, thus improving efficiency.

[0039] In extreme scenarios such as impact tests, fiber optic transmission links are prone to instantaneous loss changes, and traditional calibration coefficients cannot adapt to the changed link state, resulting in distorted temperature measurement results.

[0040] In this embodiment of the application, during the impact test, the radiation signal of the object under test is transmitted to the radiation pyrometer 6 via the second multimode fiber 5, the output amplitude of each detection channel is measured, the spectral radiance of each channel is calculated using the revised calibration coefficient, and finally the temperature to be measured is obtained by fitting the least squares method using Planck's radiation law.

[0041] In another possible embodiment, during the impact test, the radiation signal emitted by the object under test after being impacted is transmitted to the radiation pyrometer 6 via the second multimode fiber 5 to measure the output amplitude of each detection channel; the spectral radiance of each channel is calculated using the revised calibration coefficients, i.e., the spectral radiance is equal to the product of the revised calibration coefficients and the output amplitude; the spectral radiance data of all detection channels are collected, substituted into Planck's radiation law, and fitted using the least squares method to minimize the sum of squared residuals between the fitted value and the actual measured value, and finally the impact temperature of the object under test is obtained by fitting.

[0042] By using the revised calibration coefficients to calculate spectral radiance, the influence of link loss variations can be eliminated, ensuring the accuracy of temperature measurement results. By combining multi-channel spectral radiance data and using the least squares method to fit Planck's radiation law, single-channel noise interference can be effectively suppressed, improving temperature measurement accuracy and reliability. It is suitable for dynamic scenarios such as impact tests, enabling reliable temperature measurement in extreme environments and ensuring the validity of experimental data.

[0043] In this embodiment of the application, the backlight probe 4 and the object under test share the second multimode optical fiber 5 as a transmission link to ensure that the transmission paths of the backlight detection signal and the radiation signal under test are completely consistent.

[0044] In another possible embodiment, during the device installation phase, the transmission port of the return unit is aligned with the emission direction of the radiation signal from the object under test, so that the radiation signal under test passes through the return unit and enters the second multimode fiber 5 together with the return signal reflected by the return unit. This ensures that there are no additional bends, loosening or branches in the path of the second multimode fiber 5, and that the two signals are transmitted to the radiation pyrometer 6 along the same path, ensuring the consistency of transmission loss and enabling the return monitoring data to truly reflect the link status of the temperature measurement signal.

[0045] By sharing the second multimode fiber 5 as the transmission link between the return light unit and the object under test, the transmission paths of the return light monitoring signal and the radiation signal under test are completely consistent, so that the amplitude change of the return light signal can accurately reflect the transmission loss change of the temperature measurement signal, ensuring the accuracy of the calibration coefficient correction; no additional fiber optic cable is required, simplifying the device structure, reducing costs, and improving the system's compactness and reliability.

[0046] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0047] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0048] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A device for self-testing and calibration coefficient correction of a radiation pyrometer system, characterized in that, include: Broadband light source, intensity modulation unit, first multimode fiber, return probe, second multimode fiber, and radiation pyrometer; The emitted light signal from the broadband light source is incident on the intensity modulation unit and coupled to the input end of the first multimode fiber after intensity modulation. The output end of the first multimode fiber is connected to the incident port of the return light probe, and is used to transmit the modulated optical signal to the return light probe; The reflection port of the backlight probe is connected to the input end of the second multimode fiber, and is used to reflect part of the optical signal back to the second multimode fiber. The output end of the second multimode optical fiber is connected to the input port of the radiation pyrometer to transmit the reflected light signal to the radiation pyrometer; The radiation pyrometer contains multiple detection channels for receiving and recording the reflected light signals.

2. The device for self-testing and calibration coefficient correction of the radiation pyrometer system according to claim 1, characterized in that, The broadband light source has a spectral width range of 400-1700nm, a color temperature of 5000K, and an output light power intensity stability better than 1%. The spectral width range covers the working spectral width of each detection channel of the radiation pyrometer.

3. The device for self-testing and calibration coefficient correction of the radiation pyrometer system according to claim 1, characterized in that, The transmittance of the backlight probe is not less than 90% and the reflectance is not less than 5% within the working spectral width range of each detection channel of the radiation pyrometer.

4. A method for self-testing a radiation pyrometer system, applied to the apparatus for self-testing and calibration coefficient correction of the radiation pyrometer system as described in any one of claims 1-3, characterized in that, Includes the following steps: The first multimode fiber and the second multimode fiber are respectively connected to the reflection port of the backlight probe and the input port of the radiation pyrometer. A broadband light source is turned on, and after intensity modulation, the optical signal is transmitted to the return light probe through the first multimode fiber. The reflected light then returns through the second multimode fiber and enters the radiation pyrometer. The amplitude of the return light signal of each detection channel is measured and recorded as follows: , where i represents the i-th detection channel; After the actual temperature measurement system was set up, multiple multimode optical fibers were used to connect the reflection port of the return light probe and the input port of the radiation pyrometer. The broadband light source was turned on again, and the amplitude of the return light signal of each detection channel was measured and recorded as follows. ; based on and Calculate the transmission link loss of each detection channel. Its formula is expressed as: ; The criterion for a normal state is set as follows If the loss is less than 50%, if a certain detection channel's If the percentage is greater than or equal to 50%, the detection channel is considered to be in an abnormal state.

5. A method for correcting the calibration coefficients of a radiation pyrometer system, applied to the apparatus for self-testing and correcting the calibration coefficients of the radiation pyrometer system as described in any one of claims 1-3, characterized in that, Includes the following steps: A standard temperature source is placed at the location of the object to be measured, and the radiation signal from the standard temperature source is transmitted to the radiation pyrometer via a second multimode optical fiber. The output amplitude of each detection channel under the illumination of the standard temperature source is measured and recorded as follows. And the temperature value of the standard temperature source is denoted as ; The spectral radiance of a standard temperature source can be calculated using Planck's radiation law, expressed by the following formula: ,in This represents the emissivity of a standard temperature source. , , Let represent the first radiation constant and the second radiation constant, respectively. The center wavelength of the i-th detection channel is... Spectral radiance; Based on formula The initial calibration coefficients for each detection channel are calculated using the following formula: ; After calibration, keeping the temperature measurement system unchanged, turn on the broadband light source and measure the amplitude of the reflected light signal of each detection channel under the illumination of the broadband light source, and record it as follows: ; Before the experiment, the broadband light source was turned on again, and the amplitude of the reflected light signal of each detection channel under the illumination of the broadband light source was measured and recorded as follows. ; The transmission loss factor caused by changes in the transmission link after calibration is calculated, and its formula is expressed as: ; Based on formula Revise the calibration coefficients.

6. The method for correcting the calibration coefficients of a radiation pyrometer system according to claim 5, characterized in that, During the impact test, the radiation signal of the object under test is transmitted to the radiation pyrometer via the second multimode fiber. The output amplitude of each detection channel is measured, and the spectral radiance of each channel is calculated using the revised calibration coefficient. Finally, the temperature to be measured is obtained by fitting the data using Planck's radiation law and the least squares method.

7. The method for correcting the calibration coefficients of a radiation pyrometer system according to claim 5, characterized in that, The backlight probe and the object under test share the second multimode fiber as the transmission link to ensure that the transmission paths of the backlight detection signal and the radiation signal under test are completely consistent.

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