Radiation parameter calibration device and method based on fixed-point blackbody

Abstract

The application provides a fixed-point blackbody-based radiation parameter calibration device and method, which comprises a fixed-point blackbody assembly, a standard variable-temperature blackbody assembly, a radiation transfer standard component, a waveband selection device, a displacement assembly and a control assembly; the fixed-point blackbody assembly comprises a first fixed-point blackbody, a second fixed-point blackbody, a third fixed-point blackbody and a fourth fixed-point blackbody; the standard variable-temperature blackbody assembly comprises a standard normal-temperature variable-temperature blackbody radiation source and a standard medium-temperature variable-temperature blackbody radiation source; and the waveband selection device comprises a precision diaphragm assembly and a spectrum selection assembly. The application transfers the reference radiation brightness and the reference radiation intensity of the fixed-point blackbody assembly to the radiation brightness and the radiation intensity of the standard variable-temperature blackbody assembly by using the radiation transfer standard component, and calibrates the calibrated infrared radiometer at different infrared spectral wavebands by using the standard variable-temperature blackbody assembly, thereby solving the calibration problem of the existing infrared radiometer.

Description

Technical Field

[0001] This invention belongs to the field of optical metrology technology, specifically relating to a radiation parameter calibration device based on a fixed-point blackbody and a radiation parameter calibration method based on a fixed-point blackbody. Background Technology

[0002] With the development of infrared stealth technology, the accurate assessment of stealth characteristics has become an important research direction. The main parameters for assessing infrared stealth characteristics are radiance and radiance intensity. By comparing the radiance and radiance intensity values ​​before and after stealth, the infrared stealth performance can be calculated. The commonly used testing equipment for radiance and radiance intensity parameters is the infrared radiometer. In order to evaluate the testing accuracy of different infrared radiometers and ensure the consistency of measurement values, it is necessary to perform metrology.

[0003] Currently, relevant organizations have conducted research on calibration methods for infrared radiometers. For example, Chinese Patent Application No. 201110112097.1 discloses an infrared radiometer calibration device and its calibration method, which uses an infrared standard radiation source, an infrared optical collimation system, multiple standard detectors, and a computer to obtain the irradiance response curve of the infrared radiometer being calibrated, thus solving the response calibration problem of large field-of-view infrared radiometers.

[0004] However, the calibration device and calibration method for infrared radiometers proposed in the aforementioned patents only involve the responsivity calibration of large field-of-view infrared radiometers, and do not involve the calibration of the radiance and radiance intensity parameters of infrared radiometers. Summary of the Invention

[0005] The purpose of this invention is to solve the calibration problem of infrared radiometers in the prior art, and to provide a radiation parameter calibration device and a radiation parameter calibration method based on a fixed-point blackbody.

[0006] To achieve the above objectives, the technical solution provided by this invention is:

[0007] A radiation parameter calibration device based on a fixed-point blackbody is provided, including a fixed-point blackbody assembly, a standard variable-temperature blackbody assembly, a radiation transfer standard component, a band selection device, a displacement component, and a control component. The fixed-point blackbody assembly provides reference radiance and reference radiance intensity, and includes a first fixed-point blackbody, a second fixed-point blackbody, a third fixed-point blackbody, and a fourth fixed-point blackbody. The standard variable-temperature blackbody assembly provides standard radiance and standard radiance intensity at different temperatures to the infrared radiometer being calibrated, including a standard room-temperature variable-temperature blackbody radiation source and a standard medium-temperature variable-temperature blackbody radiation source. The radiation transfer standard component transfers the reference radiance and reference radiance intensity parameters from the fixed-point blackbody assembly to the standard variable-temperature blackbody assembly, completing the traceability of the radiance and radiance intensity of the standard variable-temperature blackbody assembly. The band selection device includes a precision aperture assembly and a spectral selection component. The precision aperture assembly selects different apertures to align with the fixed-point blackbody assembly or the standard variable-temperature blackbody assembly, and has a rotating wheel around the precision aperture assembly. The system includes through-holes of different sizes; a spectral selection component for selecting different infrared filters to align with a fixed-point blackbody assembly or a standard variable-temperature blackbody assembly, including infrared filters with different response bands arranged around the center of the spectral selection component's rotating wheel; a displacement component including a precision displacement stage for moving the radiation transfer standard component and a precision displacement stage for moving the band selection device; the radiation transfer standard component is mounted on the precision displacement stage for moving the radiation transfer standard component and the band selection device is mounted on the precision displacement stage for moving the band selection device; a control component including a precision displacement stage controller and a computer integrated control system; the precision displacement stage controller is electrically connected to both the precision displacement stage for moving the radiation transfer standard component and the precision displacement stage for moving the band selection device, and is used to control the movement of both the precision displacement stage for moving the radiation transfer standard component and the precision displacement stage for moving the band selection device; the computer integrated control system is electrically connected to the precision displacement stage controller, the standard room-temperature variable-temperature blackbody radiation source, the standard medium-temperature variable-temperature blackbody radiation source, the precision aperture assembly, and the spectral selection component.

[0008] Furthermore, the first fixed-point blackbody is a gallium fixed-point blackbody, used to provide a reference radiance within the radiance range of a standard room-temperature variable-temperature blackbody radiation source.

[0009] Furthermore, the second fixed-point blackbody is an indium fixed-point blackbody, used to provide a reference radiance within the radiance range of a standard room-temperature variable-temperature blackbody radiation source.

[0010] Furthermore, the third fixed-point blackbody is a zinc fixed-point blackbody, used to provide a reference radiance within the radiance range of a standard medium-temperature variable-temperature blackbody radiation source.

[0011] Furthermore, the fourth fixed-point blackbody is a silver fixed-point blackbody, used to provide a reference radiance within the radiance range of a standard medium-temperature variable-temperature blackbody radiation source.

[0012] Furthermore, the infrared filter includes a mid-wave infrared filter and a long-wave infrared filter mounted on the spectral selection component wheel. The spectral selection component wheel is provided with reserved infrared filter holes for installing spare infrared filters of other bands. The mid-wave infrared filter, the long-wave infrared filter, and the reserved infrared filter holes are evenly arranged around the center of the wheel.

[0013] A radiation parameter calibration method based on a fixed-point blackbody is also provided, which is applied to a radiation parameter calibration device, and includes the following steps:

[0014] Step 1: Select the appropriate infrared filter and aperture based on the wavelength band that the infrared radiometer to be calibrated needs to calibrate;

[0015] Step 2: Move the radiation transfer standard component, the spectrum selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the first fixed point blackbody, and measure the first voltage value output by the radiation transfer standard component.

[0016] Step 3: Move the radiation transfer standard component, the spectrum selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the second fixed point blackbody, and measure the second voltage value output by the radiation transfer standard component.

[0017] Step 4: Move the radiation transfer standard component, the spectrum selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the third fixed point blackbody, and measure the third voltage value output by the radiation transfer standard component.

[0018] Step 5: Move the radiation transfer standard component, the spectrum selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the fourth fixed point blackbody, and measure the fourth voltage value output by the radiation transfer standard component.

[0019] Step 6: Move the radiation transfer standard component, the spectral selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the standard room-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard room-temperature variable-temperature blackbody radiation source so that the voltage value output by the radiation transfer standard component is the same as the first voltage value, and calculate the first standard radiance and the first standard radiance under the corresponding state based on the current temperature and emissivity of the standard room-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard room-temperature variable-temperature blackbody radiation source again so that the voltage value output by the radiation transfer standard component is the same as the second voltage value, and calculate the corresponding second standard radiance and the second standard radiance based on the current temperature and emissivity of the standard room-temperature variable-temperature blackbody radiation source;

[0020] Step 7: Move the radiation transfer standard component, the spectral selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the standard intermediate-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard intermediate-temperature variable-temperature blackbody radiation source so that the voltage value output by the radiation transfer standard component is the same as the third voltage value, and calculate the third standard radiance and the third standard radiance intensity under the corresponding state based on the current temperature and emissivity of the standard intermediate-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard intermediate-temperature variable-temperature blackbody radiation source again so that the voltage value output by the radiation transfer standard component is the same as the fourth voltage value, and calculate the corresponding fourth standard radiance and the fourth standard radiance intensity based on the current temperature and emissivity of the standard intermediate-temperature variable-temperature blackbody radiation source;

[0021] Step 8: Align the infrared radiometer to be calibrated with the radiation center of the standard room-temperature variable-temperature blackbody radiation source. Move the spectral selection component and the precision aperture component so that the center of the infrared filter and the center of the aperture are aligned with the radiation center of the standard room-temperature variable-temperature blackbody radiation source. Set the temperature of the standard room-temperature variable-temperature blackbody radiation source. Calculate the corresponding calculated radiance and radiant intensity based on the current temperature and emissivity of the standard room-temperature variable-temperature blackbody radiation source and correct them to obtain the first corrected radiance and the first corrected radiant intensity. Use the first corrected radiance and the first corrected radiant intensity to calibrate the infrared radiometer to be calibrated.

[0022] Step 9: Align the infrared radiometer to be calibrated with the radiation center of the standard medium-temperature variable-temperature blackbody radiation source. Move the spectral selection component and the precision aperture component so that the center of the infrared filter and the center of the aperture are aligned with the radiation center of the standard medium-temperature variable-temperature blackbody radiation source. Set the temperature of the standard medium-temperature variable-temperature blackbody radiation source. Calculate and correct the corresponding radiance and radiant intensity based on the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source. Obtain the second corrected radiance and second corrected radiant intensity. Use the second corrected radiance and second corrected radiant intensity to calibrate the infrared radiometer to be calibrated.

[0023] Furthermore, in step 8, the first corrected radiance is expressed as: The first corrected radiation intensity is expressed as: Where L1 represents the radiance of the first fixed-point blackbody in step 2, L2 represents the radiance of the second fixed-point blackbody in step 3, L5 represents the first standard radiance in step 6, L6 represents the second standard radiance in step 6, and L... x1 I1 represents the radiance of the standard room-temperature variable-temperature blackbody radiation source in step 8, I2 represents the radiance of the blackbody at the first fixed point in step 2, I5 represents the first standard radiance in step 6, and I6 represents the second standard radiance in step 6. x1 This represents the radiation intensity of the standard ambient temperature variable temperature blackbody radiation source in step 8.

[0024] Furthermore, in step 9, the second corrected radiance is expressed as: The second corrected radiation intensity is expressed as: ;

[0025] Where L3 represents the radiance of the blackbody at the third fixed point in step 4, L4 represents the radiance of the blackbody at the fourth fixed point in step 5, L7 represents the third standard radiance in step 7, and L8 represents the fourth standard radiance in step 7. x2 I3 represents the radiance of the standard intermediate-temperature variable-temperature blackbody radiation source in step 9, I4 represents the radiance of the blackbody at the third fixed point in step 4, I5 represents the radiance of the blackbody at the fourth fixed point in step 5, I7 represents the third standard radiance in step 7, and I8 represents the fourth standard radiance in step 7. x2 This represents the radiation intensity of the standard intermediate-temperature variable-temperature blackbody radiation source in step 9.

[0026] The advantages of this invention are:

[0027] 1. The radiation parameter calibration device and method provided by the present invention transmits the reference radiance and radiation intensity of the fixed-point blackbody assembly to the standard variable-temperature blackbody assembly, ensuring the traceability of radiance and radiation intensity and ensuring the accuracy of infrared target radiation parameter measurement.

[0028] 2. The radiation parameter calibration method provided by this invention uses the same infrared filter and the same aperture to transfer the radiance and radiance intensity of the fixed-point blackbody component to the standard variable-temperature blackbody component, thus ensuring the accuracy of the radiation parameter transfer. Attached Figure Description

[0029] The features and advantages of the invention will become more readily apparent from the following description with reference to the accompanying drawings, which are not drawn to scale and some features are enlarged or reduced to show details of specific parts.

[0030] Figure 1 This is a schematic diagram of the radiation parameter calibration device of the present invention;

[0031] Figure 2 This is a schematic diagram showing the positional relationship between the mid-wave infrared filter, the long-wave infrared filter, and the reserved infrared filter hole in the spectral selection component of the present invention;

[0032] In the diagram: 1-First fixed-point blackbody; 2-Second fixed-point blackbody; 3-Third fixed-point blackbody; 4-Fourth fixed-point blackbody; 5-Radiation transfer standard component; 6-Precision displacement stage for transfer standard; 7-Standard room-temperature variable-temperature blackbody radiation source; 8-Standard medium-temperature variable-temperature blackbody radiation source; 9-Precision aperture assembly; 10-Spectrum selection assembly; 11-Precision displacement stage for spectrum aperture selection; 12-Precision displacement stage controller; 13-Computer integrated control system; 14-Mid-wave infrared filter; 15-Long-wave infrared filter; 16-Reserved infrared filter aperture. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments thereof. It should be noted that the following detailed description of the present invention is for illustrative purposes only and is not intended to limit the scope of the invention.

[0034] This invention provides a radiation parameter calibration device and a radiation parameter calibration method based on a fixed-point blackbody, which can solve the problem that the radiation parameters cannot be traced in the prior art, resulting in inaccurate measurement of the radiance and intensity of infrared radiometers.

[0035] like Figure 1As shown, a radiation parameter calibration device based on a fixed-point blackbody includes a fixed-point blackbody assembly, a standard variable-temperature blackbody assembly, a radiation transfer standard component 5, a band selection device, a displacement assembly, and a control assembly.

[0036] The fixed-point blackbody assembly provides reference radiance and reference radiance, including a first fixed-point blackbody 1, a second fixed-point blackbody 2, a third fixed-point blackbody 3, and a fourth fixed-point blackbody 4. The standard variable-temperature blackbody assembly provides standard radiance and standard radiance at different temperatures to the infrared radiometer being calibrated, including a standard room-temperature variable-temperature blackbody radiation source 7 and a standard medium-temperature variable-temperature blackbody radiation source 8. The radiation transfer standard component 5 transmits the reference radiance and reference radiance parameters of the fixed-point blackbody assembly to the standard variable-temperature blackbody assembly, completing the traceability of the radiance and radiance of the standard variable-temperature blackbody assembly. The band selection device includes a precision aperture assembly 9 and a spectrum selection assembly 10. The precision aperture assembly 9 selects different apertures to align with the fixed-point blackbody assembly or the standard variable-temperature blackbody assembly, and has through holes of different sizes arranged around the center of the precision aperture assembly 9's rotating wheel. The spectrum selection assembly 10 selects different infrared filters to align with the fixed-point blackbody assembly or the standard variable-temperature blackbody assembly. The standard variable-temperature blackbody assembly includes infrared filters with different response bands arranged around the center of the spectral selection assembly 10's rotating wheel; the displacement assembly includes a precision displacement stage 6 for moving the radiation transfer standard component 5 and a precision displacement stage 11 for moving the spectral aperture selection device, with the radiation transfer standard component 5 mounted on the precision displacement stage 6 and the spectral aperture selection device mounted on the precision displacement stage 11; the control assembly includes a precision displacement stage controller 12 and a computer integrated control system 13; the precision displacement stage controller 12 is electrically connected to the precision displacement stage 6 for moving the radiation transfer standard and the precision displacement stage 11 for moving the spectral aperture selection device; the computer integrated control system 13 is electrically connected to the precision displacement stage controller 12, the standard room-temperature variable-temperature blackbody radiation source 7, the standard medium-temperature variable-temperature blackbody radiation source 8, the precision aperture assembly 9, and the spectral selection assembly 10.

[0037] The following is a detailed analysis of each component:

[0038] The first fixed-point blackbody 1 is used to provide a reference radiance value within the radiance range of the standard room-temperature variable-temperature blackbody radiation source 7. The first fixed-point blackbody 1 is a gallium fixed-point blackbody with a temperature plateau duration of more than 1 hour, a melting temperature of (29.76±0.1)℃, a radiation aperture of not less than 25.4mm, a cavity normal emissivity of not less than 0.999, and a radiance temperature measurement uncertainty of not more than 50mK (k=2).

[0039] The second fixed-point blackbody 2 is used to provide a reference radiance value within the radiance range of the standard room-temperature variable-temperature blackbody radiation source 7. The second fixed-point blackbody 2 is an indium fixed-point blackbody with a temperature plateau duration of more than 1 hour, a melting temperature of (156.60±0.1)℃, a radiation aperture of not less than 25.4mm, a cavity normal emissivity of not less than 0.999, and a radiance temperature measurement uncertainty of not more than 50mK (k=2).

[0040] The third fixed-point blackbody 3 is used to provide a reference radiance value within the radiance range of the standard medium-temperature variable-temperature blackbody radiation source 8. The third fixed-point blackbody 3 is a zinc fixed-point blackbody with a temperature plateau duration of more than 1 hour, a melting temperature of (419.527±0.1)℃, a radiation aperture of not less than 25.4mm, a cavity normal emissivity of not less than 0.999, and a radiance temperature measurement uncertainty of not more than 50mK (k=2).

[0041] The fourth fixed-point blackbody 4 is used to provide a reference radiance value within the radiance range of the standard medium-temperature variable-temperature blackbody radiation source 8. The fourth fixed-point blackbody 4 is a silver fixed-point blackbody with a temperature plateau duration of more than 1 hour, a melting temperature of (961.78±0.1)℃, a radiation aperture of not less than 25.4mm, a cavity normal emissivity of not less than 0.999, and a radiance temperature measurement uncertainty of not more than 50mK (k=2).

[0042] The radiation transfer standard component 5 is used to transfer the reference radiance and radiant intensity of the first fixed-point blackbody 1, the second fixed-point blackbody 2, the third fixed-point blackbody 3, and the fourth fixed-point blackbody 4 to the standard variable-temperature blackbody assembly, thus completing the traceability of the radiance and radiant intensity parameters of the standard variable-temperature blackbody assembly. Preferably, the radiation transfer standard component 5 is a CVF infrared spectroradiometer with the following parameters: spectral range of 1.3μm-14.3μm, narrow field of view of 7mrad, field of view uniformity ±5%, wide field of view of 8.5 degrees, and field of view uniformity ±8%.

[0043] The precision displacement stage 6 is used to control the movement of the radiation transfer standard component 5 to align it with different fixed blackbody points or standard variable temperature blackbody. Preferably, the main parameters are: stroke 3000mm, load 35kg, repeatability 0.1mm, and speed 50mm / s.

[0044] The standard room-temperature variable-temperature blackbody radiation source 7 is used to provide the infrared radiometer under calibration with radiation brightness and intensity corresponding to different room temperatures. Preferably, the main parameters are: radiation aperture not less than 25.4mm, operating temperature range covering 25℃-200℃, temperature stability better than ±0.1℃ / 10min, effective emissivity not less than 0.99, and communication control via RS485 for communication connection with the computer integrated control system 13.

[0045] The standard medium-temperature variable-temperature blackbody radiation source 8 is used to provide the infrared radiometer being calibrated with radiation brightness and intensity corresponding to different medium-temperature temperatures. Preferably, the main parameters are: radiation aperture not less than 25.4mm, operating temperature range covering 150℃-1300℃, temperature stability better than ±0.2℃ / 10min, effective emissivity not less than 0.99, and communication control via RS485 for communication connection with the computer integrated control system 13.

[0046] The precision aperture assembly 9 has through holes of different sizes arranged around the center of the precision aperture assembly 9 rotating wheel. Preferably, the main parameters are: the six holes of different sizes are Ф24mm, Ф12.8mm, Ф6.4mm, Ф3.2mm, Ф1.6mm and Ф0.8mm respectively, and the repeatability is ±0.25°.

[0047] Spectral selection component 10 is used to select different filters to align with different fixed-point blackbodies or standard variable-temperature blackbodies, such as... Figure 2As shown, the infrared filters include a mid-wave infrared filter 14 and a long-wave infrared filter 15 mounted on the rotating wheel of the spectral selection component 10. The rotating wheel of the spectral selection component 10 has reserved infrared filter holes 16 for installing spare infrared filters of other wavelengths. The mid-wave infrared filter 14, the long-wave infrared filter 15, and the reserved infrared filter holes 16 are evenly arranged circumferentially around the center of the rotating wheel. The mid-wave infrared filter 14 transmits infrared radiation in the 3μm-5μm wavelength range and blocks infrared radiation below 3μm and above 5μm. The long-wave infrared filter 15 transmits infrared radiation in the 8μm-12μm wavelength range and blocks infrared radiation below 8μm and above 12μm. The reserved infrared filter holes 16 are used to install other required filters according to actual needs. The spectral selection component 10 includes multiple infrared filters of different wavelengths arranged around its center, providing calibration capabilities for infrared radiometers in other wavelength bands such as 3-5μm and 8-12μm without requiring additional equipment. Preferably, the main parameters of the mid-wave infrared filter 14 are: diameter 25.4mm + 0 / -0.2mm, thickness 1mm ± 0.2mm, coated with a 3μm to 5μm bandpass film, lower limit of 50% peak wavelength: 3000 ± 100nm, upper limit of 50% peak wavelength: 5000 ± 100nm, average transmittance of 3μm to 5μm in the passband >90%, and cutoff band: 0.4-20000nm ≤0.1%. The main parameters of the long-wave infrared filter 15 are: diameter 25.4mm + 0 / -0.2mm, thickness: 1mm ± 0.2mm, lower limit of 50% peak wavelength HP1: 8000 ± 100nm, upper limit of 50% peak wavelength HP2: 12000 ± 100nm, average transmittance of 8μm~12μm in the passband >90%, and cutoff band: 0.4-20000nm ≤1%. The reserved infrared filter aperture 16 has a diameter of 25.4mm + 0.1 / -0mm and a thickness of 1.2mm + 0.1 / -0mm.

[0048] The precision displacement stage 11 and precision displacement stage controller 12 for spectral aperture selection are used to control the precision aperture assembly 9 and the spectral selection assembly 10 to align them with different fixed-point blackbodies or standard variable-temperature blackbodies. The main parameters of the precision displacement stage 11 for spectral aperture selection are: stroke 3000mm, load 20kg, repeatability 0.1mm, and speed 50mm / s.

[0049] The computer-integrated control system 13 is used for the measurement and control of the radiation transfer standard component 5, the standard room temperature variable temperature blackbody radiation source 7, the standard medium temperature variable temperature blackbody radiation source 8, the precision aperture assembly 9, the spectrum selection assembly 10, and the precision displacement stage controller 12. The communication interface between the computer and the radiation transfer standard component 5, the precision aperture assembly 9, and the spectrum selection assembly 10 is RJ45, and the communication protocol is TCP / IP. The communication interface between the computer and the standard room temperature variable temperature blackbody radiation source 7, the standard medium temperature variable temperature blackbody radiation source 8, and the precision displacement stage controller 12 is USB2.0, and the communication protocol is RS485.

[0050] Furthermore, the present invention also provides a radiation parameter calibration method using the above-described radiation parameter calibration device based on a fixed-point blackbody, comprising the following steps:

[0051] Step 1: Select the appropriate infrared filter and aperture based on the wavelength band that the infrared radiometer to be calibrated needs to calibrate;

[0052] Step 2: Move the radiation transfer standard component 5, the spectrum selection component 10, and the precision aperture component 9 so that the center of the field of view of the radiation transfer standard component 5, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the first fixed point blackbody 1, and measure the first voltage value output by the radiation transfer standard component 5.

[0053] Step 3: Move the radiation transfer standard component 5, the spectrum selection component 10, and the precision aperture component 9 so that the center of the field of view of the radiation transfer standard component 5, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the second fixed point blackbody 2, and measure the second voltage value output by the radiation transfer standard component 5.

[0054] Step 4: Move the radiation transfer standard component 5, the spectrum selection component 10, and the precision aperture component 9 so that the center of the field of view of the radiation transfer standard component 5, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the third fixed point blackbody 3, and measure the third voltage value output by the radiation transfer standard component 5.

[0055] Step 5: Move the radiation transfer standard component 5, the spectrum selection component 10, and the precision aperture component 9 so that the center of the field of view of the radiation transfer standard component 5, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the fourth fixed point blackbody 4, and measure the fourth voltage value output by the radiation transfer standard component 5.

[0056] Step 6: Move the radiation transfer standard component 5, the spectral selection component 10, and the precision aperture component 9 so that the center of the field of view of the radiation transfer standard component 5, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the standard room-temperature variable-temperature blackbody radiation source 7; adjust the temperature of the standard room-temperature variable-temperature blackbody radiation source 7 so that the voltage value output by the radiation transfer standard component 5 is the same as the first voltage value, and calculate the first standard radiance and the first standard radiance in the corresponding state based on the current temperature and emissivity of the standard room-temperature variable-temperature blackbody radiation source 7; adjust the temperature of the standard room-temperature variable-temperature blackbody radiation source 7 again so that the voltage value output by the radiation transfer standard component 5 is the same as the second voltage value, and calculate the corresponding second standard radiance and the second standard radiance in the corresponding state based on the current temperature and emissivity of the standard room-temperature variable-temperature blackbody radiation source 7.

[0057] Step 7: Move the radiation transfer standard component 5, the spectrum selection component 10, and the precision aperture component 9 so that the center of the field of view of the radiation transfer standard component 5, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the standard intermediate-temperature variable-temperature blackbody radiation source 8; adjust the temperature of the standard intermediate-temperature variable-temperature blackbody radiation source 8 so that the voltage value output by the radiation transfer standard component 5 is the same as the third voltage value, and calculate the third standard radiance and the third standard radiance intensity under the corresponding state based on the current temperature and emissivity of the standard intermediate-temperature variable-temperature blackbody radiation source 8; adjust the temperature of the standard intermediate-temperature variable-temperature blackbody radiation source 8 again so that the voltage value output by the radiation transfer standard component 5 is the same as the fourth voltage value, and calculate the corresponding fourth standard radiance and the fourth standard radiance intensity based on the current temperature and emissivity of the standard intermediate-temperature variable-temperature blackbody radiation source 8;

[0058] Step 8: Align the infrared radiometer to be calibrated with the radiation center of the standard room-temperature variable-temperature blackbody radiation source 7. Move the spectral selection component 10 and the precision aperture component 9 so that the center of the infrared filter and the center of the aperture are aligned with the radiation center of the standard room-temperature variable-temperature blackbody radiation source 7. Set the temperature of the standard room-temperature variable-temperature blackbody radiation source 7. Calculate the corresponding calculated radiance and radiant intensity based on the current temperature and emissivity of the standard room-temperature variable-temperature blackbody radiation source 7 and correct them to obtain the first corrected radiance and the first corrected radiant intensity. Use the first corrected radiance and the first corrected radiant intensity to calibrate the infrared radiometer to be calibrated.

[0059] Step 9: Align the infrared radiometer to be calibrated with the radiation center of the standard medium-temperature variable-temperature blackbody radiation source 8. Move the spectral selection component 10 and the precision aperture component 9 so that the center of the infrared filter and the center of the aperture are aligned with the radiation center of the standard medium-temperature variable-temperature blackbody radiation source 8. Set the temperature of the standard medium-temperature variable-temperature blackbody radiation source 8. Calculate and correct the corresponding radiance and radiant intensity based on the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source 8 to obtain the second corrected radiance and second corrected radiant intensity. Use the second corrected radiance and second corrected radiant intensity to calibrate the infrared radiometer to be calibrated.

[0060] The following section uses the calibration of the radiance and radiance intensity of an infrared radiometer in the 3μm-5μm band as an example to explain each step.

[0061] In step 1, a 3μm-5μm mid-wave infrared filter 14 and a Ф24mm aperture are selected according to the wavelength of the infrared radiometer being calibrated.

[0062] In step 2, the computer integrated control system 13 controls the precision displacement stage controller 12, so that the precision displacement stage 11 for spectral aperture selection and the precision displacement stage 6 for transfer standard drive the radiation transfer standard component 5, the precision aperture assembly 9, and the spectral selection component 10 to move, so that the central axes of the 3μm-5μm mid-wave infrared filter 14, the radiation transfer standard component 5, the Ф24mm aperture, and the gallium fixed point blackbody coincide and are on the same optical path. At this time, the temperature of the gallium fixed point blackbody is T1, the emissivity is ε1, the radiance is L1, the radiation intensity is I1, and the first voltage value V1 of the radiation transfer standard component 5 is measured.

[0063] In step 3, the radiation transfer standard component 5, the precision aperture assembly 9, and the spectral selection component 10 are moved so that the central axes of the 3μm-5μm mid-wave infrared filter 14, the radiation transfer standard component 5, the Ф24mm aperture, and the indium fixed point blackbody are aligned and placed on the same optical path. At this time, the temperature of the indium fixed point blackbody is T2, the emissivity is ε2, the radiance is L2, and the radiance is I2. The second voltage value V2 of the radiation transfer standard component 5 is measured.

[0064] In step 4, the radiation transfer standard component 5, the precision aperture assembly 9, and the spectral selection component 10 are moved so that the central axes of the 3μm-5μm mid-wave infrared filter 14, the radiation transfer standard component 5, the Ф24mm aperture, and the zinc fixed point blackbody are aligned and placed on the same optical path. At this time, the temperature of the zinc fixed point blackbody is T3, the emissivity is ε3, the radiance is L3, and the radiance is I3. The third voltage value V3 of the radiation transfer standard component 5 is measured.

[0065] In step 5, the radiation transfer standard component 5, the precision aperture assembly 9, and the spectral selection component 10 are moved so that the central axes of the 3μm-5μm mid-wave infrared filter 14, the radiation transfer standard component 5, the Ф24mm aperture, and the silver fixed point blackbody are aligned and placed on the same optical path. At this time, the temperature of the silver fixed point blackbody is T4, the emissivity is ε4, the radiance is L4, and the radiance is I4. The fourth voltage value V4 of the radiation transfer standard component 5 is measured.

[0066] In step 6, the radiation transfer standard component 5, precision aperture assembly 9, and spectral selection component 10 are moved to align the central axes of the 3μm-5μm mid-wave infrared filter 14, radiation transfer standard component 5, Ф24mm aperture, and standard room-temperature variable-temperature blackbody radiation source 7, placing them on the same optical path. The temperature of the standard room-temperature variable-temperature blackbody radiation source 7 is adjusted so that the voltage values ​​obtained by the radiation transfer standard component 5 and the gallium fixed-point blackbody are consistent with the first voltage value V1. At this time, the temperature of the standard room-temperature variable-temperature blackbody radiation source 7 is T5, and the emissivity of the standard room-temperature variable-temperature blackbody radiation source 7 is ε4. The corresponding radiance is calculated to be L5, and the radiant intensity is I5. The temperature of the standard room-temperature variable-temperature blackbody radiation source 7 is further adjusted so that the voltage values ​​obtained by the radiation transfer standard component 5 and the indium fixed-point blackbody are consistent with the second voltage value V2. At this time, the temperature of the standard room-temperature variable-temperature blackbody radiation source 7 is T6, and the corresponding radiance is calculated to be L6, and the radiant intensity is I6.

[0067] In step 7, the radiation transfer standard component 5, the precision aperture assembly 9, and the spectral selection component 10 are moved so that the central axes of the 3μm-5μm mid-wave infrared filter 14, the radiation transfer standard component 5, the Ф24mm aperture, and the standard medium-temperature variable-temperature blackbody radiation source 8 are aligned and placed on the same optical path. The temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 is adjusted so that the voltage value obtained by the radiation transfer standard component 5 and the zinc fixed-point blackbody is consistent with the third voltage value V3. At this time, the temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 is T7, and the emissivity of the standard medium-temperature variable-temperature blackbody radiation source 8 is ε5. The corresponding radiance is calculated to be L7 and the radiant intensity is I7. The temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 is further adjusted so that the voltage value obtained by the radiation transfer standard component 5 and the silver fixed-point blackbody is consistent with the fourth voltage value V4. At this time, the temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 is T8, and the corresponding radiance is calculated to be L8 and the radiant intensity is I8.

[0068] In step 8, the radiation transfer standard component 5, the precision aperture assembly 9, and the spectral selection component 10 are moved to make the central axes of the 3μm-5μm mid-wave infrared filter 14, the Ф24mm aperture, the standard room-temperature variable-temperature blackbody radiation source 7, and the infrared radiometer being calibrated coincide and be on the same optical path; the temperature of the standard room-temperature variable-temperature blackbody radiation source 7 is set to T. x1 The calculated corresponding radiance is L.x1 The radiation intensity is I x1 The first corrected radiance is expressed as: The first corrected radiation intensity is expressed as: .

[0069] In step 9, the radiation transfer standard component 5, the precision aperture assembly 9, and the spectral selection component 10 are moved so that the central axes of the 3μm-5μm mid-wave infrared filter 14, the Ф24mm aperture, the standard mid-temperature variable-temperature blackbody radiation source 8, and the infrared radiometer being calibrated are aligned and placed on the same optical path; the temperature of the standard mid-temperature variable-temperature blackbody radiation source 8 is set to T. x2 The calculated corresponding radiance is L. x2 The radiation intensity is I x2 The second corrected radiance is expressed as: The second corrected radiation intensity is expressed as: .

[0070] For calibrating the radiance and intensity of infrared radiometers in other bands, simply switch the aperture in the precision aperture assembly 9 and the infrared filter in the spectrum selection assembly 10.

[0071] The radiation parameter calibration device and method provided by this invention transfers the reference radiance and intensity of a fixed-point blackbody assembly to a standard variable-temperature blackbody assembly, ensuring the traceability of radiance and intensity and the accuracy of infrared target radiation parameter measurements. During the transfer of radiance and intensity from the fixed-point blackbody assembly to the standard variable-temperature blackbody assembly, the same infrared filter and aperture are used, guaranteeing the accuracy of the radiation parameter transfer. This method can be applied to the radiation characteristic testing of aircraft engines, skins, etc., solving the problems of standardization and traceability of existing infrared radiation measurement values.

[0072] Finally, it should be noted that the features mentioned and / or shown in the above description of exemplary embodiments of the present invention can be combined in the same or similar manner with one or more other embodiments, combined with features in other embodiments, or substituted for corresponding features in other embodiments. These combined or substituted technical solutions should also be considered to be included within the scope of protection of the present invention.

Claims

1. A radiation parameter calibration device based on a fixed-point blackbody, characterized in that, It includes a fixed-point blackbody assembly, a standard variable-temperature blackbody assembly, a radiation transfer standard component, a band selection device, a displacement assembly, and a control assembly; The fixed-point blackbody assembly is used to provide reference radiance and reference radiance, and includes a first fixed-point blackbody, a second fixed-point blackbody, a third fixed-point blackbody, and a fourth fixed-point blackbody. The standard variable-temperature blackbody assembly is used to provide the infrared radiometer being calibrated with standard radiance and standard radiance at different temperatures, including a standard room-temperature variable-temperature blackbody radiation source and a standard medium-temperature variable-temperature blackbody radiation source. The radiation transfer standard component is used to transmit the reference radiance and reference radiance parameters of the fixed-point blackbody assembly to the standard variable-temperature blackbody assembly, thereby completing the traceability of the radiance and radiance of the standard variable-temperature blackbody assembly. The band selection device includes a precision aperture assembly and a spectral selection assembly; the precision aperture assembly is used to select different apertures to align with the fixed-point blackbody assembly or the standard variable-temperature blackbody assembly, and has through holes of different sizes arranged around the center of the precision aperture assembly's rotating wheel; the spectral selection assembly is used to select different infrared filters to align with the fixed-point blackbody assembly or the standard variable-temperature blackbody assembly, and includes infrared filters with different response bands arranged around the center of the spectral selection assembly's rotating wheel. The displacement assembly includes a precision displacement stage for moving the radiation transfer standard component and a precision displacement stage for moving the spectral aperture selection device. The radiation transfer standard component is mounted on the precision displacement stage for moving the radiation transfer standard component, and the spectral aperture selection device is mounted on the precision displacement stage for moving the band selection device. The control components include a precision displacement stage controller and a computer-integrated control system. The precision displacement stage controller is electrically connected to the precision displacement stage for transferring standards and the precision displacement stage for selecting spectral apertures, respectively, and is used to control the movement of the precision displacement stage for transferring standards and the precision displacement stage for selecting spectral apertures. The computer-integrated control system is electrically connected to the precision displacement stage controller, the standard room-temperature variable-temperature blackbody radiation source, the standard medium-temperature variable-temperature blackbody radiation source, the precision aperture assembly, and the spectral selection assembly, respectively.

2. The radiation parameter calibration device according to claim 1, characterized in that, The first fixed-point blackbody is a gallium fixed-point blackbody, used to provide a reference radiance within the radiance range of the standard room-temperature variable-temperature blackbody radiation source.

3. The radiation parameter calibration device according to claim 1, characterized in that, The second fixed-point blackbody is an indium fixed-point blackbody, used to provide a reference radiance within the radiance range of the standard room-temperature variable-temperature blackbody radiation source.

4. The radiation parameter calibration device according to claim 1, characterized in that, The third fixed-point blackbody is a zinc fixed-point blackbody, used to provide a reference radiance within the radiance range of the standard medium-temperature variable-temperature blackbody radiation source.

5. The radiation parameter calibration device according to claim 1, characterized in that, The fourth fixed-point blackbody is a silver fixed-point blackbody, used to provide a reference radiance within the radiance range of the standard medium-temperature variable-temperature blackbody radiation source.

6. The radiation parameter calibration device according to claim 1, characterized in that, The infrared filter includes a mid-wave infrared filter and a long-wave infrared filter mounted on the spectral selection component wheel. The spectral selection component wheel is provided with a reserved infrared filter hole for installing spare infrared filters of other wavelengths. The mid-wave infrared filter, the long-wave infrared filter, and the reserved infrared filter hole are uniformly arranged around the center of the wheel.

7. A method for calibrating radiation parameters based on a fixed-point blackbody, characterized in that, The radiation parameter calibration apparatus according to any one of claims 1-6 comprises the following steps: Step 1: Select the appropriate infrared filter and aperture according to the wavelength band that the infrared radiometer to be calibrated needs to calibrate; Step 2: Move the radiation transfer standard component, the spectral selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the first fixed point blackbody, and measure the first voltage value output by the radiation transfer standard component. Step 3: Move the radiation transfer standard component, the spectral selection component, and the precision aperture assembly so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the second fixed point blackbody, and measure the second voltage value output by the radiation transfer standard component; Step 4: Move the radiation transfer standard component, the spectral selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the third fixed point blackbody, and measure the third voltage value output by the radiation transfer standard component. Step 5: Move the radiation transfer standard component, the spectral selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the fourth fixed point blackbody, and measure the fourth voltage value output by the radiation transfer standard component. Step 6: Move the radiation transfer standard component, the spectral selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the standard room-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard room-temperature variable-temperature blackbody radiation source so that the voltage value output by the radiation transfer standard component is the same as the first voltage value, and calculate the first standard radiance and the first standard radiance under the corresponding state based on the current temperature and emissivity of the standard room-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard room-temperature variable-temperature blackbody radiation source again so that the voltage value output by the radiation transfer standard component is the same as the second voltage value, and calculate the corresponding second standard radiance and the second standard radiance based on the current temperature and emissivity of the standard room-temperature variable-temperature blackbody radiation source; Step 7: Move the radiation transfer standard component, the spectral selection component, and the precision aperture component so that the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the aperture are aligned with the radiation center of the standard intermediate-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard intermediate-temperature variable-temperature blackbody radiation source so that the voltage value output by the radiation transfer standard component is the same as the third voltage value, and calculate the third standard radiance and the third standard radiance in the corresponding state based on the current temperature and emissivity of the standard intermediate-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard intermediate-temperature variable-temperature blackbody radiation source again so that the voltage value output by the radiation transfer standard component is the same as the fourth voltage value, and calculate the corresponding fourth standard radiance and the fourth standard radiance intensity based on the current temperature and emissivity of the standard intermediate-temperature variable-temperature blackbody radiation source; Step 8: Align the infrared radiometer to be calibrated with the radiation center of the standard room-temperature variable-temperature blackbody radiation source. Move the spectral selection component and the precision aperture component so that the center of the infrared filter and the center of the aperture are aligned with the radiation center of the standard room-temperature variable-temperature blackbody radiation source. Set the temperature of the standard room-temperature variable-temperature blackbody radiation source. Calculate and correct the corresponding calculated radiance and radiant intensity based on the current temperature and emissivity of the standard room-temperature variable-temperature blackbody radiation source to obtain the first corrected radiance and the first corrected radiant intensity. Use the first corrected radiance and the first corrected radiant intensity to calibrate the infrared radiometer to be calibrated. Step 9: Align the infrared radiometer to be calibrated with the radiation center of the standard intermediate-temperature variable-temperature blackbody radiation source. Move the spectral selection component and the precision aperture component so that the center of the infrared filter and the center of the aperture are aligned with the radiation center of the standard intermediate-temperature variable-temperature blackbody radiation source. Set the temperature of the standard intermediate-temperature variable-temperature blackbody radiation source. Calculate and correct the corresponding radiance and radiant intensity based on the current temperature and emissivity of the standard intermediate-temperature variable-temperature blackbody radiation source to obtain a second corrected radiance and a second corrected radiant intensity. Use the second corrected radiance and the second corrected radiant intensity to calibrate the infrared radiometer to be calibrated.

8. The radiation parameter calibration method according to claim 7, characterized in that, In step 8, the first corrected radiance is expressed as: The first corrected radiation intensity is expressed as: ; Where L1 represents the radiance of the first fixed-point blackbody in step 2, L2 represents the radiance of the second fixed-point blackbody in step 3, L5 represents the first standard radiance in step 6, L6 represents the second standard radiance in step 6, and L... x1 I1 represents the radiance of the standard room-temperature variable-temperature blackbody radiation source in step 8, I2 represents the radiance of the blackbody at the first fixed point in step 2, I5 represents the first standard radiance in step 6, and I6 represents the second standard radiance in step 6. x1 This represents the radiation intensity of the standard ambient temperature variable temperature blackbody radiation source in step 8.

9. The radiation parameter calibration method according to claim 7, characterized in that, In step 9, the second corrected radiance is expressed as: The second corrected radiation intensity is expressed as: ; Where L3 represents the radiance of the blackbody at the third fixed point in step 4, L4 represents the radiance of the blackbody at the fourth fixed point in step 5, L7 represents the third standard radiance in step 7, and L8 represents the fourth standard radiance in step 7. x2 I3 represents the radiance of the standard intermediate-temperature variable-temperature blackbody radiation source in step 9, I4 represents the radiance of the blackbody at the third fixed point in step 4, I5 represents the radiance of the blackbody at the fourth fixed point in step 5, I7 represents the third standard radiance in step 7, and I8 represents the fourth standard radiance in step 7. x2 This represents the radiation intensity of the standard intermediate-temperature variable-temperature blackbody radiation source in step 9.

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