Radiation parameter calibration device and method based on fixed point black body

Abstract

The invention provides a radiation parameter calibration device and method based on a fixed point black body. The radiation parameter calibration device comprises a fixed point black body assembly, a standard variable temperature black body assembly, a radiation transfer standard component, a wave band selection device, a displacement assembly and a control assembly. The fixed point black body assembly comprises a first fixed point black body, a second fixed point black body, a third fixed point black body and a fourth fixed point black body; 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; the wave band selection device comprises a precise diaphragm assembly and a spectrum selection assembly. According to the invention, the radiation transfer standard component is used to transfer the reference radiation brightness and the reference radiation intensity of the fixed point black body assembly to the radiation brightness and the radiation intensity of the standard variable temperature black body assembly, and the standard variable temperature black body assembly is used to calibrate the calibrated infrared radiometer in different infrared spectrum bands. The calibration problem of an existing infrared radiometer is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical metrology, and particularly relates 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 Art

[0002] With the development of infrared stealth technology, the accurate evaluation of stealth characteristics has become an important research direction. The main parameters for evaluating infrared stealth characteristics are radiance and radiation intensity. By comparing the radiance and radiation intensity values before and after stealth, the infrared stealth performance can be calculated. The commonly used test equipment for testing radiance and radiation intensity parameters is an infrared radiometer. In order to evaluate the test accuracy of different infrared radiometers and ensure the unity of quantity values, it is necessary to calibrate them.

[0003] Currently, relevant units have studied the calibration method for infrared radiometers. For example, Chinese Patent with 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 responsivity curve of the calibrated infrared radiometer, and solves the problem of responsivity calibration for large-field-of-view infrared radiometers.

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

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

[0006] To achieve the above purpose, the technical solutions provided by the present invention are as follows:

[0007] A radiation parameter calibration device based on fixed-point blackbodies is provided, which includes 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 is used to provide a reference radiation luminance and a reference radiation 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 is used to provide a standard radiation luminance and a standard radiation intensity at different temperatures for the infrared radiometer to be calibrated, and includes a standard normal-temperature variable-temperature blackbody radiation source and a standard medium-temperature variable-temperature blackbody radiation source; the radiation transfer standard component is used to transfer the reference radiation luminance and reference radiation intensity parameters of the fixed-point blackbody assembly to the standard variable-temperature blackbody assembly to complete the traceability of the radiation luminance and radiation intensity 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 and align them 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 wheel; the spectral selection assembly is used to select different infrared filters and align them 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 wheel; the displacement component includes a precision displacement stage for transferring standards to move the radiation transfer standard component and a precision displacement stage for spectral aperture selection to move the band selection device. The radiation transfer standard component is installed on the precision displacement stage for transferring standards, and the band selection device is installed on the precision displacement stage for spectral aperture selection; the control component includes 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 spectral aperture selection respectively, and is used to control the movement of the precision displacement stage for transferring standards and the precision displacement stage for spectral aperture selection; the computer integrated control system is electrically connected to the precision displacement stage controller, the standard normal-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.

[0008] Further, the first fixed-point blackbody is a gallium fixed-point blackbody, which is used to provide a reference radiation luminance within the radiation luminance range of the standard normal-temperature variable-temperature blackbody radiation source.

[0009] Further, the second fixed-point blackbody is an indium fixed-point blackbody, which is used to provide a reference radiation luminance within the radiation luminance range of the standard normal-temperature variable-temperature blackbody radiation source.

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

[0011] Further, the fourth fixed-point blackbody is a silver fixed-point blackbody, which is used to provide a reference radiation luminance within the radiation luminance range of the 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 rotating wheel of the spectral selection component. There are reserved infrared filter holes on the rotating wheel of the spectral selection component 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 circumferentially around the center of the rotating 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 a suitable infrared filter and diaphragm according to the band to be calibrated by the infrared radiometer to be calibrated;

[0015] Step 2: Move the radiation transfer standard component, the spectral selection component, and the precision diaphragm component to align the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the diaphragm 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 spectral selection component, and the precision diaphragm component to align the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the diaphragm 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 spectral selection component, and the precision diaphragm component to align the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the diaphragm 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 spectral selection component, and the precision diaphragm component to align the center of the field of view of the radiation transfer standard component, the center of the infrared filter, and the center of the diaphragm 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 field center 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 normal-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard normal-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 radiation luminance and the first standard radiation intensity in the corresponding state according to the current temperature and emissivity of the standard normal-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard normal-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 radiation luminance and the second standard radiation intensity according to the current temperature and emissivity of the standard normal-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 field center 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 medium-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard medium-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 radiation luminance and the third standard radiation intensity in the corresponding state according to the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard medium-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 radiation luminance and the fourth standard radiation intensity according to the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source;

[0021] Step 8: Align the infrared radiometer under calibration with the radiation center of the standard normal-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 normal-temperature variable-temperature blackbody radiation source; set the temperature of the standard normal-temperature variable-temperature blackbody radiation source, calculate the corresponding calculated radiation luminance and radiation intensity according to the current temperature and emissivity of the standard normal-temperature variable-temperature blackbody radiation source and correct them to obtain the first corrected radiation luminance and the first corrected radiation intensity, and calibrate the infrared radiometer under calibration using the first corrected radiation luminance and the first corrected radiation luminance;

[0022] Step 9: Align the radiation center of 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 to align the center of the infrared filter and the center of the aperture 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 the corresponding radiation luminance and radiation intensity according to the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source, and correct them to obtain the second corrected radiation luminance and the second corrected radiation intensity. Use the second corrected radiation luminance and the second corrected radiation luminance to calibrate the infrared radiometer to be calibrated.

[0023] Further, in Step 8, the first corrected radiation luminance is expressed as: The first corrected radiation intensity is expressed as: Where, L 1 represents the radiation luminance of the first fixed-point blackbody in Step 2, L 2 represents the radiation luminance of the second fixed-point blackbody in Step 3, L 5 represents the first standard radiation luminance in Step 6, L 6 represents the second standard radiation luminance in Step 6, L x1 represents the radiation luminance of the standard normal-temperature variable-temperature blackbody radiation source in Step 8, I 1 represents the radiation intensity of the first fixed-point blackbody in Step 2, I 2 represents the radiation intensity of the second fixed-point blackbody in Step 3, I 5 represents the first standard radiation intensity in Step 6, L 6 represents the second standard radiation intensity in Step 6, I x1 represents the radiation intensity of the standard normal-temperature variable-temperature blackbody radiation source in Step 8.

[0024] Further, in Step 9, the second corrected radiation luminance is expressed as: The second corrected radiation intensity is expressed as:

[0025] Where, L 3 represents the radiation luminance of the third fixed-point blackbody in Step 4, L 4 represents the radiation luminance of the fourth fixed-point blackbody in Step 5, L 7 represents the third standard radiation luminance in Step 7, L 8 represents the fourth standard radiation luminance in Step 7, L x2 represents the radiation luminance of the standard medium-temperature variable-temperature blackbody radiation source in Step 9, I 3 represents the radiation intensity of the third fixed-point blackbody in Step 4, I 4 represents the radiation intensity of the fourth fixed-point blackbody in Step 5, L 7 represents the third standard radiation intensity in Step 7, L 8Represents the fourth standard radiation intensity in step 7, I x2 Represents the radiation intensity of the standard medium-temperature variable-temperature blackbody radiation source in step 9.

[0026] The advantages of the present invention are:

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

[0028] 2. In the process of transferring the radiation luminance and radiation intensity of the fixed-point blackbody component to the standard variable-temperature blackbody component by the radiation parameter calibration method provided by the present invention, the same infrared filter and the same aperture are used, ensuring the accuracy of the radiation parameter transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Through the following description with reference to the drawings, the features and advantages of the present invention will become more easily understood. The drawings are not drawn to scale, and some features are enlarged or reduced to show the details of specific components. In the drawings:

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

[0031] Figure 2 is a schematic diagram of the positional relationship among 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 figure: 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 normal-temperature variable-temperature blackbody radiation source; 8 - Standard medium-temperature variable-temperature blackbody radiation source; 9 - Precision aperture assembly; 10 - Spectral selection component; 11 - Precision displacement stage for spectral 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 hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The present invention will be described in detail below with reference to the exemplary embodiments of the present invention with the aid of the drawings. It should be noted that the following detailed description of the present invention is only for the purpose of illustration and does not limit the present invention.

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

[0035] As Figure 1 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 is used to provide a reference radiation brightness and a reference radiation intensity, and includes 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 is used to provide a standard radiation brightness and a standard radiation intensity at different temperatures for the infrared radiometer to be calibrated, and includes a standard normal-temperature variable-temperature blackbody radiation source 7 and a standard medium-temperature variable-temperature blackbody radiation source 8; the radiation transfer standard component 5 is used to transfer the reference radiation brightness and reference radiation intensity parameters of the fixed-point blackbody assembly to the standard variable-temperature blackbody assembly to complete the traceability of the radiation brightness and radiation intensity of the standard variable-temperature blackbody assembly; the band selection device includes a precision aperture assembly 9 and a spectral selection assembly 10; the precision aperture assembly 9 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 provided around the center of the rotating wheel of the precision aperture assembly 9; the spectral selection assembly 10 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 provided around the center of the rotating wheel of the spectral selection assembly 10; the displacement assembly includes a precision displacement stage 6 for transferring standards for moving the radiation transfer standard component 5 and a precision displacement stage 11 for spectral aperture selection for moving the band selection device. The radiation transfer standard component 5 is installed on the precision displacement stage 6 for transferring standards, and the band selection device is installed on the precision displacement stage 11 for spectral aperture selection; 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 transferring standards and the precision displacement stage 11 for spectral aperture selection respectively, and is used to control the movement of the precision displacement stage 6 for transferring standards and the precision displacement stage 11 for spectral aperture selection; the computer integrated control system 13 is electrically connected to the precision displacement stage controller 12, the standard normal-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 respectively.

[0037] The following is a detailed and specific 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 normal-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 value of (29.76 ± 0.1) °C, a radiation aperture of not less than 25.4 mm, a cavity normal emissivity of not less than 0.999, and a brightness temperature measurement uncertainty of not more than 50 mK (k = 2).

[0039] The second fixed-point blackbody 2 is used to provide a reference radiance value within the radiance range of the standard normal-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 value of (156.60 ± 0.1) °C, a radiation aperture of not less than 25.4 mm, a cavity normal emissivity of not less than 0.999, and a brightness temperature measurement uncertainty of not more than 50 mK (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 value of (419.527 ± 0.1) °C, a radiation aperture of not less than 25.4 mm, a cavity normal emissivity of not less than 0.999, and a brightness temperature measurement uncertainty of not more than 50 mK (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 value of (961.78 ± 0.1) °C, a radiation aperture of not less than 25.4 mm, a cavity normal emissivity of not less than 0.999, and a brightness temperature measurement uncertainty of not more than 50 mK (k = 2).

[0042] The radiation transfer standard component 5 is used to transfer the reference radiance and radiation 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, and complete the traceability of the radiation brightness and radiation intensity parameters of the standard variable-temperature blackbody assembly. Preferably, the radiation transfer standard component 5 is a CVF infrared spectral radiometer, with parameters: spectral range of 1.3 μm - 14.3 μm, narrow field of view of 7 mrad, field of view uniformity of ±5%, wide field of view of 8.5 degrees, and field of view uniformity of ±8%.

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

[0044] The standard normal and variable temperature blackbody radiation source 7 is used to provide the corresponding radiation luminance and radiation intensity at different temperatures for the infrared radiometer to be calibrated. Preferably, the main parameters are as follows: the radiation aperture is not less than 25.4 mm, the working temperature range covers 25°C - 200°C, the temperature stability is better than ±0.1°C / 10 min, the effective emissivity is not less than 0.99, the communication control is RS485, and it is used for communication connection with the computer integrated control system 13.

[0045] The standard medium temperature and variable temperature blackbody radiation source 8 is used to provide the corresponding radiation luminance and radiation intensity at different temperatures for the infrared radiometer to be calibrated. Preferably, the main parameters are as follows: the radiation aperture is not less than 25.4 mm, the working temperature range covers 150°C - 1300°C, the temperature stability is better than ±0.2°C / 10 min, the effective emissivity is not less than 0.99, the communication control is RS485, and it is used 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 turntable. Preferably, the main parameters are as follows: the 6 hole positions with different sizes are Ф24mm, Ф12.8mm, Ф6.4mm, Ф3.2mm, Ф1.6mm, Ф0.8mm respectively, and the repeat positioning accuracy is ±0.25°.

[0047] The spectral selection component 10 is used to select different filter plates to align them with different fixed point blackbodies or standard variable temperature blackbodies, such as Figure 2As shown in the figure, the infrared filter includes a mid-wave infrared filter 14 and a long-wave infrared filter 15 mounted on the rotating wheel of the spectral selection component 10. There is a reserved infrared filter hole 16 on the rotating wheel of the spectral selection component 10 for installing spare infrared filters of other bands. The mid-wave infrared filter 14, the long-wave infrared filter 15, and the reserved infrared filter hole 16 are evenly arranged circumferentially along the center of the rotating wheel. Among them, the mid-wave infrared filter 14 is used to transmit infrared radiation in the 3μm - 5μm band and block infrared radiation below the 3μm band and above the 5μm band. The long-wave infrared filter 15 is used to transmit infrared radiation in the 8μm - 12μm band and block infrared radiation below the 8μm band and above the 12μm band. The reserved infrared filter hole 16 installs other required filters according to actual needs. The spectral selection component 10 includes infrared filters of multiple different bands arranged around its center, and has the calibration ability for infrared radiometers in other bands such as 3 - 5μm and 8 - 12μm without adding 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 band-pass film layer in the infrared band of 3μm - 5μm, 50% peak wavelength lower limit: 3000 ± 100nm, 50% peak wavelength upper limit: 5000 ± 100nm, average transmittance of the passband 3μm - 5μm > 90%, cut-off 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, 50% peak wavelength lower limit HP1: 8000 ± 100nm, 50% peak wavelength upper limit HP2: 12000 ± 100nm, average transmittance of the passband 8μm - 12μm > 90%, cut-off band: 0.4 - 20000nm ≤ 1%. The diameter of the reserved infrared filter hole 16 is 25.4mm +0.1 / -0mm, and the thickness is: 1.2mm +0.1 / -0mm.

[0048] The precision displacement stage 11 and the precision displacement stage controller 12 for spectral aperture selection are used to control the precision aperture component 9 and the spectral selection component 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 accuracy 0.1mm, 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 normal temperature variable temperature blackbody radiation source 7, the standard medium temperature variable temperature blackbody radiation source 8, the precision aperture assembly 9, the spectral selection assembly 10, and the precision displacement stage controller 12; the communication interfaces between the computer and the radiation transfer standard component 5, the precision aperture assembly 9, and the spectral selection assembly 10 are RJ45, and the communication protocol is TCP / IP. The communication interfaces between the computer and the standard normal temperature variable temperature blackbody radiation source 7, the standard medium temperature variable temperature blackbody radiation source 8, and the precision displacement stage controller 12 are USB2.0, and the communication protocol is RS485.

[0050] In addition, the present invention also provides a radiation parameter calibration method using the above-mentioned radiation parameter calibration device based on a fixed-point blackbody, including the following steps:

[0051] Step 1: Select a suitable infrared filter and aperture according to the wavelength band to be calibrated by the infrared radiometer to be calibrated;

[0052] Step 2: Move the radiation transfer standard component 5, the spectral selection assembly 10, and the precision aperture assembly 9 to align 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 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 spectral selection assembly 10, and the precision aperture assembly 9 to align 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 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 spectral selection assembly 10, and the precision aperture assembly 9 to align 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 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 spectral selection assembly 10, and the precision aperture assembly 9 to align 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 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 to align the field center of the radiation transfer standard component 5, the center of the infrared filter, and the center of the aperture with the radiation center of the standard normal-temperature variable-temperature blackbody radiation source 7; adjust the temperature of the standard normal-temperature variable-temperature blackbody radiation source 7 to make the voltage value output by the radiation transfer standard component 5 the same as the first voltage value, and calculate the first standard radiation luminance and the first standard radiation intensity in the corresponding state according to the current temperature and emissivity of the standard normal-temperature variable-temperature blackbody radiation source 7; adjust the temperature of the standard normal-temperature variable-temperature blackbody radiation source 7 again to make the voltage value output by the radiation transfer standard component 5 the same as the second voltage value, and calculate the corresponding second standard radiation luminance and the second standard radiation intensity according to the current temperature and emissivity of the standard normal-temperature variable-temperature blackbody radiation source 7;

[0057] Step 7: Move the radiation transfer standard component 5, the spectral selection component 10, and the precision aperture component 9 to align the field center of the radiation transfer standard component 5, the center of the infrared filter, and the center of the aperture with the radiation center of the standard medium-temperature variable-temperature blackbody radiation source 8; adjust the temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 to make the voltage value output by the radiation transfer standard component 5 the same as the third voltage value, and calculate the third standard radiation luminance and the third standard radiation intensity in the corresponding state according to the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source 8; adjust the temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 again to make the voltage value output by the radiation transfer standard component 5 the same as the fourth voltage value, and calculate the corresponding fourth standard radiation luminance and the fourth standard radiation intensity according to the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source 8;

[0058] Step 8: Align the infrared radiometer to be calibrated with the radiation center of the standard normal-temperature variable-temperature blackbody radiation source 7, move the spectral selection component 10 and the precision aperture component 9 to align the center of the infrared filter and the center of the aperture with the radiation center of the standard normal-temperature variable-temperature blackbody radiation source 7; set the temperature of the standard normal-temperature variable-temperature blackbody radiation source 7, calculate the corresponding calculated radiation luminance and radiation intensity according to the current temperature and emissivity of the standard normal-temperature variable-temperature blackbody radiation source 7 and correct them to obtain the first corrected radiation luminance and the first corrected radiation intensity, and calibrate the infrared radiometer to be calibrated with the first corrected radiation luminance and the first corrected radiation luminance;

[0059] Step 9: Align the radiation center of 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 to align the center of the infrared filter and the center of the aperture 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 the corresponding radiation luminance and radiation intensity based on the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source 8 and correct them to obtain the second corrected radiation luminance and the second corrected radiation intensity. Use the second corrected radiation luminance and the second corrected radiation luminance to calibrate the infrared radiometer to be calibrated.

[0060] Next, taking the calibration of the radiation luminance and radiation intensity of an infrared radiometer in the 3μm - 5μm band as an example, each step will be described.

[0061] In Step 1, select a 3μm - 5μm mid-wave infrared filter 14 and a Ф24mm aperture according to the band of the infrared radiometer to be calibrated.

[0062] In Step 2, the computer integrated control system 13 controls the precision displacement stage controller 12 to move the precision displacement stage 11 for spectral aperture selection and the precision displacement stage 6 for transfer standard respectively to drive the radiation transfer standard component 5, the precision aperture component 9, and the spectral selection component 10, 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 T 1 , the emissivity is ε 1 , the radiation luminance is L 1 , the radiation intensity is I 1 , and the first voltage value V of the radiation transfer standard component 5 is measured 1 .

[0063] In Step 3, move the radiation transfer standard component 5, the precision aperture component 9, and the spectral selection component 10 to make 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 coincide and be on the same optical path. At this time, the temperature of the indium fixed-point blackbody is T 2 , the emissivity is ε 2 , the radiation luminance is L 2 , the radiation intensity is I 2 , and the second voltage value V of the radiation transfer standard component 5 is measured 2 .

[0064] In Step 4, 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 zinc fixed-point blackbody coincide and are on the same optical path. At this time, the temperature of the zinc fixed-point blackbody is T 3 , the emissivity is ε 3 , the radiance is L 3 , the radiation intensity is I 3 , and measure the third voltage value V of the radiation transfer standard part 5 3 .

[0065] In Step 5, 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 silver fixed-point blackbody coincide and are on the same optical path. At this time, the temperature of the silver fixed-point blackbody is T 4 , the emissivity is ε 4 , the radiance is L 4 , the radiation intensity is I 4 , and measure the fourth voltage value V of the radiation transfer standard part 5 4 .

[0066] In Step 6, 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 standard normal temperature variable temperature blackbody radiation source 7 coincide and are on the same optical path; adjust the temperature of the standard normal temperature variable temperature blackbody radiation source 7 so that the voltage values obtained by the radiation transfer standard part 5 and the gallium fixed-point blackbody are the same as the first voltage value V 1 . At this time, the temperature of the standard normal temperature variable temperature blackbody radiation source 7 is T 5 , the emissivity of the standard normal temperature variable temperature blackbody radiation source 7 is ε 4 , calculate the corresponding radiance as L 5 , and the radiation intensity is I 5 . Continue to adjust the temperature of the standard normal temperature variable temperature blackbody radiation source 7 so that the voltage values obtained by the radiation transfer standard part 5 and the indium fixed-point blackbody are the same as the second voltage value V 2 . At this time, the temperature of the standard normal temperature variable temperature blackbody radiation source 7 is T 6 , calculate the corresponding radiance as L 6 , and the radiation intensity is I 6 .

[0067] In step 7, 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 standard medium-temperature variable-temperature blackbody radiation source 8 coincide and are on the same optical path; adjust the temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 so that the voltage values obtained from the radiation transfer standard component 5 and the zinc fixed-point blackbody are consistent with the third voltage value V 3 At this time, the temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 is T 7 , and the emissivity of the standard medium-temperature variable-temperature blackbody radiation source 8 is ε 5 , calculate the corresponding radiance as L 7 , and the radiation intensity is I 7 . Continue to adjust the temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 so that the voltage values obtained from the radiation transfer standard component 5 and the silver fixed-point blackbody are consistent with the fourth voltage value V 4 At this time, the temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 is T 8 , calculate the corresponding radiance as L 8 , and the radiation intensity is I 8 .

[0068] In step 8, 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 Ф24mm aperture, the standard normal-temperature variable-temperature blackbody radiation source 7, and the infrared radiometer under calibration coincide and are on the same optical path; set the temperature of the standard normal-temperature variable-temperature blackbody radiation source 7 as T x1 , calculate the corresponding radiance as L x1 , and the radiation intensity is I x1 , and the first corrected radiance is expressed as: The first corrected radiation intensity is expressed as:

[0069] In step 9, 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 Ф24mm aperture, the standard medium-temperature variable-temperature blackbody radiation source 8, and the infrared radiometer under calibration coincide and are on the same optical path; set the temperature of the standard medium-temperature variable-temperature blackbody radiation source 8 as T x2 , calculate the corresponding radiance as L x2 , and the radiation intensity is I x2 , and the second corrected radiance is expressed as: The second corrected radiation intensity is expressed as:

[0070] For the calibration of the radiance and radiation intensity of infrared radiometers in other bands, only the aperture in the precision aperture assembly 9 and the infrared filter in the spectral selection assembly 10 need to be switched.

[0071] The radiation parameter calibration device and method provided by the present invention transfer the reference radiance and radiation intensity of the fixed-point blackbody assembly to the standard variable-temperature blackbody assembly, ensuring the traceability of the radiance and radiation intensity and the accuracy of the measurement of infrared target radiation parameters. During the process of transferring the radiance and radiation intensity of the fixed-point blackbody assembly to the standard variable-temperature blackbody assembly, the same infrared filter and the same aperture are used, ensuring the accuracy of the transfer of radiation parameters. The method of the present invention can be applied to the radiation characteristic tests of aircraft engines, skins, etc., to solve the problems of the unification 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 the exemplary embodiments of the present invention can be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or replace the corresponding features in other embodiments. The technical solutions obtained by such combination or replacement should also be regarded as being included within the protection scope 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 black body component, a standard variable temperature black body component, a radiation transfer standard component, a band selection device, a displacement component and a control component; The fixed point blackbody assembly is used to provide reference radiation brightness and reference radiation 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 is used to provide the infrared radiometer being calibrated with standard radiation brightness and standard radiation intensity at different temperatures, including a standard normal temperature variable temperature blackbody radiation source and a standard medium temperature variable temperature blackbody radiation source; The radiation transfer standard component is used to transfer the reference radiation brightness and reference radiation intensity parameters of the fixed-point blackbody component to the standard variable-temperature blackbody component, so as to complete the traceability of the radiation brightness and radiation intensity of the standard variable-temperature blackbody component; The waveband selection device comprises a precision aperture assembly and a spectrum selection assembly; the precision aperture assembly is used to select different apertures to align them 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 rotating wheel of the precision aperture assembly; the spectrum selection assembly is used to select different infrared filters to align them with the fixed point blackbody assembly or the standard variable temperature blackbody assembly, and comprises infrared filters of different response wavebands arranged around the center of the rotating wheel of the spectrum selection assembly; The displacement assembly comprises a transfer standard precision displacement stage for moving the radiation transfer standard component and a spectral aperture selection precision displacement stage for moving the waveband selection device, wherein the radiation transfer standard component is mounted on the transfer standard precision displacement stage, and the waveband selection device is mounted on the spectral aperture selection precision displacement stage; The control component includes a precision translation stage controller and a computer integrated control system; the precision translation stage controller is electrically connected to the precision translation stage for transfer standard and the precision translation stage for spectral aperture selection, respectively, and is used to control the movement of the precision translation stage for transfer standard and the precision translation stage for spectral aperture selection; the computer integrated control system is electrically connected to the precision translation stage controller, the standard normal 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, which is used to provide a reference radiation brightness within the radiation brightness range of the standard normal-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, which is used to provide a reference radiation brightness within the radiation brightness range of the standard normal-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, which is used to provide a reference radiation brightness within the radiation brightness 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, which is used to provide a reference radiation brightness within the radiation brightness 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 medium-wave infrared filter and a long-wave infrared filter installed 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 bands. The medium-wave infrared filter, the long-wave infrared filter and the reserved infrared filter hole are evenly arranged along the circumference of the center of the wheel.

7. A radiation parameter calibration method based on a fixed point black body, characterized in that: The radiation parameter calibration device according to any one of claims 1 to 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 spectrum selection component and the precision aperture component so that the field center 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 black body, and measure the first voltage value output by the radiation transfer standard component; Step 3: Move the radiation transfer standard component, the spectrum selection component and the precision aperture component to align the field center of the radiation transfer standard component, the center of the infrared filter and the center of the aperture with the radiation center of the second fixed point black body, and measure the second voltage value output by the radiation transfer standard component; Step 4: Move the radiation transfer standard component, the spectrum selection component and the precision aperture component so that the field center 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 black body, and measure the third voltage value output by the radiation transfer standard component; Step 5: Move the radiation transfer standard component, the spectrum selection component and the precision aperture component so that the field center 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 black body, and measure the fourth voltage value output by the radiation transfer standard component; Step 6: Move the radiation transfer standard component, the spectrum selection component and the precision aperture component so that the field of view center 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 normal temperature variable temperature blackbody radiation source; adjust the temperature of the standard normal 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 radiation brightness and the first standard radiation intensity under the corresponding state according to the current temperature and emissivity of the standard normal temperature variable temperature blackbody radiation source; adjust the temperature of the standard normal 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 radiation brightness and the second standard radiation intensity according to the current temperature and emissivity of the standard normal temperature variable temperature blackbody radiation source; Step 7: Move the radiation transfer standard component, the spectrum selection component and the precision aperture component so that the field center 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 medium-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard medium-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 radiation brightness and the third standard radiation intensity under the corresponding state according to the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source; adjust the temperature of the standard medium-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 radiation brightness and the fourth standard radiation intensity according to the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source; Step 8: Align the calibrated infrared radiometer with the radiation center of the standard normal temperature variable temperature blackbody radiation source, move the spectrum selection component and the precision aperture component, align the center of the infrared filter and the center of the aperture with the radiation center of the standard normal temperature variable temperature blackbody radiation source; set the temperature of the standard normal temperature variable temperature blackbody radiation source, calculate and correct the corresponding calculated radiation brightness and radiation intensity according to the current temperature and emissivity of the standard normal temperature variable temperature blackbody radiation source, obtain the first corrected radiation brightness and the first corrected radiation intensity, and use the first corrected radiation brightness and the first corrected radiation brightness to calibrate the calibrated infrared radiometer; Step 9: Align the calibrated infrared radiometer with the radiation center of the standard medium-temperature variable-temperature blackbody radiation source, move the spectrum selection component and the precision aperture component, and align the center of the infrared filter and the center of the aperture 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 radiation brightness and radiation intensity according to the current temperature and emissivity of the standard medium-temperature variable-temperature blackbody radiation source, and obtain the second corrected radiation brightness and the second corrected radiation intensity, and use the second corrected radiation brightness and the second corrected radiation brightness to calibrate the calibrated infrared radiometer.

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: Among them, L1 represents the radiation brightness of the first fixed point black body in step 2, L2 represents the radiation brightness of the second fixed point black body in step 3, L5 represents the first standard radiation brightness in step 6, L6 represents the second standard radiation brightness in step 6, L x1 represents the radiation brightness of the standard room temperature variable temperature black body radiation source in step 8, I1 represents the radiation intensity of the first fixed point black body in step 2, I2 represents the radiation intensity of the second fixed point black body in step 3, I5 represents the first standard radiation intensity in step 6, L6 represents the second standard radiation intensity in step 6, I x1 Represents the radiation intensity of the standard room 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: Among them, L3 represents the radiation brightness of the third fixed point black body in step 4, L4 represents the radiation brightness of the fourth fixed point black body in step 5, L7 represents the third standard radiation brightness in step 7, L8 represents the fourth standard radiation brightness in step 7, L x2 represents the radiation brightness of the standard medium-temperature variable-temperature blackbody radiation source in step 9, I3 represents the radiation intensity of the third fixed-point blackbody in step 4, I4 represents the radiation intensity of the fourth fixed-point blackbody in step 5, L7 represents the third standard radiation intensity in step 7, L8 represents the fourth standard radiation intensity in step 7, I x2 Represents the radiation intensity of the standard medium-temperature variable-temperature blackbody radiation source in step 9.

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