Combustion chamber wall surface medium wave infrared temperature measurement correction method considering background reflection radiation
By using calibration experiments and linear regression fitting, the influence of background reflected radiation in combustion chamber wall temperature measurement was resolved, achieving high-precision infrared temperature measurement correction, which is suitable for combustion chamber temperature monitoring under complex operating conditions.
Patent Information
- Application Number
- CN202511830227.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2025-12-04
- Filing Date
- 2025-12-05
- Publication Date
- 2026-03-17
AI Technical Summary
In the high-temperature environment of the combustion chamber, the thermal radiation signal received by the infrared detector is the superposition of the target surface's own radiation and the background reflected radiation, which causes the conventional radiation temperature measurement results to deviate significantly from the true value. Existing technologies cannot accurately quantify the reflected radiation component and make effective corrections, affecting the accuracy and reliability of temperature measurement.
The equivalent background radiation source temperature was measured and calibrated through calibration experiments. A radiation transmission model for the detector was established and corrected during actual temperature measurement. The target temperature was measured using a mid-wave infrared detector and a thermocouple. A parameterized correction model was established by combining linear regression fitting to solve the influence of background reflection.
It significantly improves the accuracy and reliability of combustion chamber wall temperature measurement, overcomes the error problem of traditional infrared thermometry in complex radiation environments, and enhances its application value and system integration convenience under varying operating conditions.
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Figure CN121677955A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of temperature measurement technology, specifically relating to a method for correcting mid-wave infrared temperature measurement of combustion chamber walls that takes into account background reflected radiation. Background Technology
[0002] As gas turbine technology continues to advance towards higher efficiency and higher power, the initial temperature of the gas is constantly increasing. The combustion chamber, as a core component, bears the heat load of the high-temperature gas. Under prolonged operation, it is prone to problems such as coating peeling, creep, and corrosion, affecting the safe and normal operation of the entire unit. Therefore, it is necessary to measure and monitor the temperature of the combustion chamber wall.
[0003] Radiation thermometry, with its significant advantages such as non-contact measurement, high sensitivity, rapid response, and wide measurement range, has become an important means of industrial temperature detection. However, since the emissivity and transmissivity of real objects cannot both be 1, reflection phenomena will occur on the object's surface. In radiation thermometry under the high-temperature background of a combustion chamber, the thermal radiation signal received by the infrared detector is the superposition of the target surface's own radiation and the background reflected radiation. This effect often causes the results of direct emissivity correction in conventional radiation thermometry to deviate significantly from the true value. Therefore, accurately quantifying and correcting the reflected radiation component is the core issue for improving temperature measurement accuracy.
[0004] Existing research on radiation thermometry methods to address the influence of background reflection mainly focuses on the following areas, and these existing technologies suffer from the following technical problems:
[0005] (1) A temperature measurement model is established for the actual temperature measurement scenario, and the radiation angle coefficient of each component in the background is solved, and then corrected in combination with the background temperature. However, the background temperature is usually determined using simulation data or single-point temperature measurement data, and the accuracy of the input data cannot be guaranteed. In addition, the process of solving the radiation angle coefficient is relatively complex and cumbersome.
[0006] (2) When the background temperature is similar to the temperature of the target, the radiation on the target surface is similar to that of a blackbody, and its emissivity can be considered to be 1. This method is only suitable for radiation temperature measurement of the inner surface of a cavity with relatively uniform temperature, and is not suitable for scenarios with non-uniform surfaces inside a boiler furnace or combustion chamber.
[0007] Current gas turbine temperature data monitoring demands higher accuracy. Therefore, addressing the impact of background reflection in radiation thermometry is crucial for improving measurement accuracy and data reliability. Summary of the Invention
[0008] The purpose of this invention is to provide a mid-wave infrared temperature measurement correction method for combustion chamber walls that takes into account background reflected radiation. The method measures and calibrates the equivalent background radiation source temperature through calibration experiments and corrects the temperature measurement results during actual temperature measurement to ensure the accuracy and reliability of the temperature measurement results.
[0009] To achieve the above objectives, the present invention provides the following technical solution:
[0010] This invention discloses a method for correcting mid-wave infrared thermometry of combustion chamber walls that takes into account background reflected radiation.
[0011] The following steps:
[0012] S1. For radiation thermometry scenarios affected by background reflection, establish a radiation transmission model for the detector reception:
[0013]
[0014] Among them, E 总 E represents the total radiation intensity received by the detector; ε represents the emissivity of the target surface, and (1-ε) is the reflectivity; b,λ (T) represents the radiation intensity of a blackbody at temperature T at the detector response wavelength λ. obj X represents the temperature of the target object itself; obj,i ε represents the angular coefficient of the target object relative to the background. i T represents the background apparent emissivity. bg,i This represents the actual background temperature; n represents the number of blocks into which the overall background environment is divided according to temperature.
[0015] S2. Simplify the detector receiving radiative transfer model in step S1:
[0016] E 总 =εE b,λ (T obj )+(1-ε)E b,λ (T bg )
[0017] Among them, T bg This represents the equivalent background radiation source temperature, which is simplified by incorporating background radiation. Equivalent to the radiation of a blackbody at a certain temperature;
[0018] The corrected formula for calculating the true temperature of the target object is derived as follows:
[0019]
[0020] T obj =E b,λ -1 (T obj )
[0021] Among them, the total radiation intensity E 总 The emissivity ε of the target object was measured using an infrared detector and obtained through an emissivity experiment. The equivalent background radiation source temperature T was also measured. bgThen, the measurement and calibration are performed through a calibration experiment;
[0022] S3, the equivalent background radiation source temperature T in a certain temperature measurement scenario. bg The calibration experiment was conducted, and the measurement calculation formula is as follows:
[0023]
[0024] T bg =E b,λ -1 (T bg )
[0025] In the calibration experiment, a method using both thermocouples and infrared detectors to measure the target was employed. 总 The temperature measured by the thermocouple, obtained through an infrared detector, is taken as the true temperature T of the target object. obj E can be calculated as follows b,λ (T obj After solving, the data is recorded and used as the equivalent background radiation source temperature T in this scenario. bg In the same temperature measurement scenario, this data can be substituted into the correction formula in step S2 to solve for the target temperature.
[0026] S4. For scenarios with multiple operating conditions, repeat step S3 under different operating conditions, and set the equivalent background radiation source temperature T. bg The parameters (X1, X2, ...) that characterize the operating conditions of the temperature measurement scenario are correlated, and linear regression fitting is performed:
[0027] T bg = aX1 + bX2 + ...
[0028] Where a and b represent the regression coefficients of the corresponding parameters X1 and X2;
[0029] S5. During the actual temperature measurement process, the equivalent background radiation source temperature T is calculated based on the known scenario conditions (parameters X1, X2, etc.) and the fitting result formula obtained in step S4. bg The temperature of the target object can then be obtained by solving the corrected formula in step S2.
[0030] As a further improvement, the E described in this invention 总 The measurement method includes the following steps:
[0031] S21. Using a mid-wave infrared (3.7–3.9 μm) band infrared detector, perform blackbody radiation calibration on the infrared detector used, and establish a mathematical model relationship between the detector's voltage response and the blackbody temperature at different measurement temperatures. The total radiation intensity E... 总 It can be calculated using the following formula:
[0032]
[0033] Where α represents the spectral response band of the infrared detector; c1 = 3.7418 × 10 -16 W·m 2 , representing the first radiation constant; c2 = 1.44 × 10 -2 m·K represents the second radiation constant; T b Indicates the blackbody temperature;
[0034] T b =E b,λ -1 (T b The above process is the inverse operation. Considering the complexity of the function, in practice, I can be established. 总 -T b For the curve, select the interpolation method to calculate the temperature.
[0035] S22. The emissivity ε of the target to be measured can be measured in advance using the energy method, as shown in the following formula:
[0036]
[0037] Among them, T a The surface brightness temperature of an object is measured by an infrared detector; T b The true temperature of an object is obtained from a thermocouple; ambient temperature T e It can be approximated as room temperature.
[0038] As a further improvement, in step S3 of the present invention, the measurement of thermocouples and infrared detectors needs to be carried out after the overall temperature of the scene is close to thermal equilibrium. The measurement data of the thermocouple of the target to be tested is observed to change by no more than 1K within 1 minute. Experimental data collection is then started, and the data within 1 minute is collected and the average value is calculated.
[0039] In step S3, the measuring point of the thermocouple is close to the target surface, and the measured temperature can accurately reflect the target surface temperature.
[0040] As a further improvement, in step S4 of the present invention, the parameters for characterizing the temperature measurement scenario should be selected to be parameters related to the ambient temperature. For the measurement of the combustion chamber wall temperature of a gas turbine, air flow rate, gas flow rate, and air-fuel ratio are selected as parameters. At the same time, the regression model uses the formula in step S4.
[0041] In summary, this invention provides a method for correcting mid-wave infrared thermometry of combustion chamber walls by considering background reflected radiation, which has the following beneficial effects:
[0042] (1) An innovative radiation transfer model under the influence of background reflected radiation and its simplified form were constructed, and a background reflection correction formula applicable to engineering practice was proposed. This model comprehensively considers the coupling effect of background radiation and wall reflection in high-temperature combustion environment, and breaks through the limitation of traditional infrared thermometry in eliminating background reflected radiation interference. It significantly improves the accuracy of temperature measurement in complex radiation environment from the methodological level.
[0043] (2) The mid-wave infrared band (3.7–3.9 μm) is used for detection, which effectively avoids the strong absorption interference of infrared radiation by carbon dioxide and water vapor in combustion products, enhances the applicability and stability of the technology in combustion diagnosis, and solves the problem of large temperature measurement error in traditional bands under high-temperature gas environment.
[0044] (3) Innovatively introduce the equivalent background radiation source temperature (T) based on calibration experiments. bg The direct measurement method replaces the previous methods that relied on simulation or single-point temperature measurement for rough estimation, making the calibration of background reflection components more realistic and reliable, and greatly improving the engineering practicality and reliability of the correction model.
[0045] (4) For complex application scenarios with multiple operating conditions, it is proposed to adjust the equivalent background radiation source temperature T bg A parametric correction model is established by regression fitting with measurable operating parameters. This method not only has good adaptability and scalability to different operating conditions, but also enables rapid, online correction, significantly improving the application value and system integration convenience of this technology under varying operating conditions. Attached Figure Description
[0046] Figure 1 This is an implementation flowchart provided by the modified method proposed according to the present invention;
[0047] Figure 2 This is a schematic diagram of the radiation thermometry experimental apparatus under the influence of background reflection provided in an embodiment of the present invention;
[0048] Figure 3 This is a comparison chart of temperature measurement results of a mid-wave infrared detector and a long-wave infrared detector under the condition of high-temperature gas shielding, provided by the present invention.
[0049] Figure 4 This is a graph showing the relationship between the equivalent background radiation source temperature and the heating furnace setting temperature obtained from the calibration experiment provided in the embodiments of the present invention.
[0050] Figure 5 This is a data curve of the correction result provided according to an embodiment of the present invention.
[0051] In the diagram, 1 is the infrared detector, 2 is the processing terminal, 3 is the thermocouple acquisition module, 4 is the high-temperature resistance heating furnace, 5 is the target to be tested, 6 is the temperature controller, 7 is the thermocouple on the inner wall of the furnace, 8 is the thermocouple on the surface of the target to be tested, and 9 is the butane flame torch. Detailed Implementation
[0052] To make the objectives, technical solutions, and advantages of the invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific examples described herein are merely illustrative and do not constitute a limitation thereof.
[0053] The purpose of this invention is to provide a method for correcting mid-wave infrared temperature measurement of combustion chamber walls by taking into account background reflected radiation. Figure 1 This is a flowchart illustrating the implementation of the modified method proposed in this invention. Figure 1 As shown, the method includes: First, establishing a radiative transfer model under the influence of background reflection and deriving a correction formula to provide a theoretical basis for radiation thermometry correction; Second, selecting a mid-wave infrared detector calibrated with a blackbody temperature for temperature measurement, and specifying the equivalent background radiation source temperature parameter T that needs to be input into the correction formula. bg Multi-condition calibration experiments were conducted to determine the value in advance through experiments, enhancing the accuracy of the data and the effectiveness of the correction results. Finally, during the actual temperature measurement of the target object, the corresponding equivalent background radiation source temperature T was calculated by combining the operating condition information of the temperature measurement scenario. bg The relevant parameters are then substituted into the correction formula to correct the measurement results, thereby retrieving the true temperature of the target surface. The following will provide a detailed description of the mid-wave infrared temperature measurement correction method for combustion chamber walls considering background reflected radiation, provided by this invention, through specific embodiments.
[0054] like Figure 2The simulated combustion chamber temperature measurement experimental device shown includes a mid-wave infrared detector 1, a processing terminal 2, a thermocouple acquisition module 3, a high-temperature resistance heating furnace 4, a target under test 5, a temperature controller 6, a furnace inner wall thermocouple 7, a target surface thermocouple 8, and a butane flame torch 9. The infrared detector 1 is connected to the processing terminal 2 via wires, allowing for non-contact measurement of the target surface temperature 5. The target 5 is placed inside the furnace chamber of the high-temperature resistance heating furnace 4, in contact with the measuring point of the target surface thermocouple 8. The target surface thermocouple 8 is connected to the thermocouple acquisition module 3 via wires. The thermocouple acquisition module 3 is connected to the processing terminal 2, transmitting the thermocouple temperature signal to the processing terminal 2. The furnace inner wall thermocouple 7 is placed inside the high-temperature resistance heating furnace 4, and its wires are connected to the temperature controller 6. The temperature controller 6 can be placed arbitrarily; in this device, it is placed above the high-temperature resistance heating furnace 4. The thermocouples 7 inside the furnace chamber of the high-temperature resistance heating furnace 4 are enclosed. The target 5 and the thermocouples 8 on its surface are placed through the furnace door of the high-temperature resistance heating furnace 4 and extended into the furnace through the back channel, respectively. The furnace door of the high-temperature resistance heating furnace 4 has a window to provide an optical channel for the measurement of the mid-wave infrared detector 1. The butane flame torch 9 can be placed on the optical path of the mid-wave infrared detector 1.
[0055] The high-temperature resistance heating furnace 4 heats the internal furnace chamber through resistance wires, creating a high-temperature environment and simultaneously heating the target 5. The target 5 is fixed to the inner wall of the furnace chamber and connected to a surface thermocouple 8. The measurement result serves as the true surface temperature of the target 5. Data is received by the thermocouple acquisition module 3 and stored in the processing terminal 2. Thermocouple 7 on the inner wall of the furnace chamber collects the surface temperature at a point inside the furnace chamber and inputs it to the temperature controller 6. The temperature controller 6 controls the temperature at this point using PID control. Due to the uneven temperature inside the furnace chamber, this temperature cannot represent the background temperature; however, when the internal temperature is stable, it can be considered a parameter characterizing the furnace's operating condition. The mid-wave infrared detector 1 is positioned at the same height as the target 5 and receives the radiant energy from the target 5 through the observation window of the high-temperature resistance heating furnace 4, generating a signal in response. A butane flame torch 9 is used to simulate the effect of gas shielding and provides a high-temperature flame for comparing the interference effects of gas shielding at different wavelengths. The specific steps of the embodiment are as follows:
[0056] S1. For radiation thermometry scenarios affected by background reflection, establish a radiation transmission model for the detector reception:
[0057]
[0058] Among them, E 总 E represents the total radiation intensity received by the detector; ε represents the emissivity of the surface of the target 5, and (1-ε) is the reflectivity; b,λ(T) represents the radiation intensity of a blackbody at temperature T at the detector response wavelength λ. obj X represents the temperature of the target object 5 itself; obj,i ε represents the angular coefficient of the target object against the background. i T represents the background apparent emissivity. bg,i This represents the actual background temperature; n represents the number of blocks into which the overall background environment is divided according to temperature.
[0059] Considering the difficulty in obtaining the angular coefficient, background apparent emissivity, and actual background temperature in the model, the detector receiving radiative transfer model in step S1 is simplified as follows:
[0060] E 总 =εE b,λ (T obj )+(1-i)E b,λ (T bg (1)
[0061] Among them, T bg This represents the equivalent background radiation source temperature, which is simplified by incorporating background radiation. Equivalent to the radiation of a blackbody at a certain temperature;
[0062] The corrected formula for calculating the true temperature of target 5 is derived as follows:
[0063]
[0064] T obj =E b,λ -1 (T obj (3)
[0065] Among them, the total radiation intensity E 总 The emissivity ε of the target 5 was measured by an infrared detector and obtained through an emissivity experiment. The equivalent background radiation source temperature T was also measured. bg Then, the measurement and calibration are performed through a calibration experiment;
[0066] The corrected formula requires input parameters including the total radiation intensity E. 总 The emissivity ε of the target under test and the equivalent background radiation source temperature T bg .
[0067] S2. This invention selects an infrared detector in the mid-wave infrared (3.7–3.9 μm) band to address the problem of interference from high-temperature combustion products (mainly carbon dioxide and water vapor) in the temperature measurement path. Blackbody radiation calibration is performed on the infrared detector used, establishing a mathematical model relationship between the detector's voltage response and the blackbody temperature at different measurement temperatures. This allows for the calculation of the total radiation intensity I. 总 :
[0068]
[0069] Where λ represents the spectral response band of the infrared detector; c1 = 3.7418 × 10 -16 W·m 2 , representing the first radiation constant; c2 = 1.44 × 10 -2 m·K represents the second radiation constant; T b This represents the blackbody temperature.
[0070] like Figure 2 The simulated combustion chamber temperature measurement experimental setup shown includes a butane flame torch 9 placed in the detection optical path of an infrared thermal imager. The flame of the butane flame torch 9 can reach a maximum temperature of 1373.15 K, with a gas thickness of approximately 32 mm. The flame is pale blue, indicating complete combustion, and the influence of soot particles caused by incomplete combustion is negligible. The effects of radiation thermometry on gas thickness in the mid-wave infrared and long-wave infrared bands are compared and explained. During the experiment, two thermal imagers with different spectral response bands were used to represent two different infrared bands, and the number of flame torches was varied to control different gas thicknesses.
[0071] The experiment obtained high-temperature gas with thicknesses of 32mm, 64mm, 96mm, 128mm, and 160mm by placing 1 to 5 spray guns sequentially. A comparison of the temperature measurement results when the mid-wave infrared and long-wave infrared detectors 1 measured the same target temperature is shown in the figure below. Figure 3 As shown.
[0072]
[0073] S3. The surface emissivity ε of the target 5 is measured in advance using the energy method, as shown in the following formula:
[0074]
[0075] Among them, T a The surface brightness temperature of an object is measured by an infrared detector; T b The true temperature of an object is obtained from a thermocouple; ambient temperature T e It can be approximated as room temperature.
[0076] S4. Adjust the set temperature T of the temperature controller 66 on the high-temperature resistance heating furnace 44. r To stabilize the temperature measurement scenario under a specific operating condition, the equivalent background radiation source temperature T is measured using a combination of thermocouples and infrared detectors. bg The calibration experiment was conducted, and the measurement calculation formula is as follows:
[0077]
[0078] T bg =E b,λ -1 (T bg (7)
[0079] Among them, E 总 The temperature measured by the thermocouple, obtained through an infrared detector, is taken as the true temperature T of the target 5. obj .
[0080] S5, Change the set temperature T r Repeat step S4 to obtain the equivalent background radiation source temperature T under multiple operating conditions. bg Set the temperature T of the temperature controller 66 r As a parameter characterizing the temperature measurement scenario in this embodiment, it is related to the equivalent background radiation source temperature T. bg By performing linear regression fitting, we can obtain:
[0081] T bg =aT r 2 +bT r +c (8)
[0082] Where a, b, and c are regression coefficients. The results are as follows: Figure 4 As shown.
[0083] S6. During the actual temperature measurement process, the set temperature T is known. r The equivalent background radiation source temperature T under this working condition can be calculated by combining the formula (8) obtained in step S5. bg Combining the corrected formula derived in step S1, and substituting the total radiation intensity E... 总 The emissivity ε of the target under test and the equivalent background radiation source temperature T bg The corrected measured temperature can then be obtained. The correction result for a specific operating condition is as follows: Figure 5 As shown, the temperature measurement result corrected by the present invention is closer to the temperature measured by a thermocouple than the uncorrected result. The correction method proposed in this invention improves the accuracy of infrared temperature measurement.
[0084] The radiation thermometry method disclosed in this invention measures and calibrates the equivalent background radiation source temperature T through calibration experiments. bg The emissivity of the surface under test can be measured, and the temperature measured by the infrared detector can be corrected under known scene conditions to retrieve the true surface temperature of the target 5.
[0085] Although embodiments of the present invention have been shown above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
[0086] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A method for correcting a mid-wave infrared temperature measurement in a combustion chamber wall surface taking into account background reflected radiation, characterized in that, The following steps are: S1, for the radiation thermometry scene under the influence of background reflection, a detector receives radiation transmission model is established: Wherein, E 总 represents the total radiation intensity received by the detector; ε represents the emissivity of the surface of the target to be measured, and (1-ε) is the reflectivity; E b,λ (T) represents the radiation intensity of a black body at temperature T at the wavelength λ of the detector response, T obj represents the temperature of the target to be measured; X obj,i represents the angular coefficient of the target to be measured to the background; ε i represents the apparent emissivity of the background, T bg,i represents the actual temperature of the background; n represents the number of blocks into which the overall background environment is divided according to temperature; S2, the detector receives radiation transmission model in step S1 is simplified: E 总 = εE b,λ (T obj )+(1-ε)E b,λ (T bg ) where T bg represents the equivalent background radiation source temperature, which is the background emission equivalent to the radiation of a black body at a certain temperature; The correction formula for solving the real temperature of the target to be measured is derived as: T obj = E b,λ -1 (T obj ) Wherein, total radiation intensity E 总 The emissivity of the target to be measured ε is measured by an infrared detector, and the equivalent background radiation source temperature T bg Then, it is measured and calibrated through a calibration experiment; S3, the equivalent background radiation source temperature T in a certain temperature measurement scene bg The calibration experiment is measured, and the measurement calculation formula is: T bg = E b,λ -1 (T bg ) In the calibration experiment, the thermocouple and infrared detector are used to measure the target together, E 总 The thermocouple measures the temperature as the real temperature T of the target obj , and the infrared detector measures the temperature as the equivalent background radiation source temperature T b,λ , so as to calculate E obj , record the data after solving, and take the equivalent background radiation source temperature T bg In the same scene temperature measurement, the data can be substituted into the correction formula of step S2 to solve the target temperature. S4, for the multi-working condition scene, repeating step S3 under different working conditions, and taking the equivalent background radiation source temperature T bg Linear regression fitting is performed in association with the parameters (X1, X2…) capable of characterizing the working condition of the temperature measurement scene: T bg = aX1 + bX2 + … Where a, b represent the regression coefficients of corresponding parameters X1, X2; S5、In the actual temperature measurement process, the equivalent background radiation source temperature T is calculated according to the known scene working condition (parameters X1, X2, …) and the fitting result formula obtained in step S4 bg That is, the temperature of the target to be measured can be solved according to the correction formula of step S2.
2. The method for correction of pyrometry under influence of background reflections according to claim 1, characterized in that , said E 总 The measuring method of the present application comprises the following steps: S21, using the mid-wave infrared (3.7~3.9 μm) band of infrared detector, the used infrared detector is blackbody radiation calibration, the mathematical model relationship between the voltage response of the detector and the blackbody temperature at different measurement temperatures is established, the total radiation intensity E 总 That is, it can be calculated by the following formula: where λ represents the spectral response band of the infrared detector; c1=3.7418x10 -16 W·m 2 represents the first radiation constant; c2=1.44x10 -2 m·K, represents the second radiation constant; T b represents the blackbody temperature; T b = E b,λ -1 (T b ) is the inverse operation of the above process, considering the complexity of the function, the actual process can be established I 总 -T b curve, select interpolation method for temperature calculation; S22, the emissivity ε of the target to be measured can be measured in advance by energy method, the formula is as follows: where T a represents the surface brightness temperature of the object, obtained by the infrared detector; T b represents the real temperature of the object, obtained by the thermocouple; and the ambient temperature T e can be approximated as room temperature.
3. The radiation thermometry correction method under the influence of background reflection according to claim 1 or 2, characterized in that, In step S3, the measurement of thermocouple and infrared detector needs to be carried out after the overall temperature of the scene approaches thermal equilibrium, the change of the thermocouple measurement data of the target to be measured within 1 minute is observed, and the experimental data collection is started, the data within 1 minute is collected and the average value is taken for calculation; In step S3, the measurement point of the thermocouple is close to the target surface, and the measurement temperature can accurately reflect the target surface temperature.
4. The method for correction of pyrometry under influence of background reflections according to claim 3, characterized in that, In step S4, the parameters representing the working conditions of the temperature measurement scene should be selected, and the parameters related to the environmental temperature should be selected, for the gas turbine combustion chamber wall temperature measurement, the air flow, the gas flow and the air-fuel ratio are selected as the parameters, at the same time, the regression model uses the formula in step S4.