Device for on-orbit calibration of infrared radiation measuring instrument

Abstract

The utility model discloses a device for on-orbit calibration of an infrared radiation measuring instrument, which belongs to the technical field of thermal metrology and comprises an artificial black body used for generating thermal radiation with set intensity; the cooling pipe type light path system is used for transmitting radiation emitted by the artificial black body; comprising at least one low-temperature refrigeration device used for maintaining a low-temperature environment of the light path system; the off-axis ellipsoidal reflector is used for converging and reflecting radiation to the infrared radiation measuring instrument; the light path switching mechanism is used for changing the pose of the off-axis ellipsoidal reflector and realizing light path switching among different infrared radiation measuring instruments; and the control system can control the radiation intensity of the artificial black body and the action of the light path switching mechanism. By integrating the artificial black body, the cooling pipe type light path system, the off-axis ellipsoid reflector, the light path switching mechanism and the control system, the infrared radiation measuring instrument is accurately calibrated, and the problem that the measurement precision is reduced due to the fact that the on-orbit time is too long is solved.

Description

Technical Field

[0001] This utility model belongs to the field of thermal metrology technology, specifically relating to a device for on-orbit calibration of an infrared radiation measuring instrument. Background Technology

[0002] In aerospace, nuclear physics, biomedicine and other fields, certain excellent low-temperature properties of materials have attracted widespread attention, and related low-temperature technologies have been applied to many industries. For example, in aerospace systems, cryogenic liquid hydrogen is used as a clean and efficient fuel in rocket systems; in nuclear energy systems, ultra-low temperature isothermal technology is used to control nuclear reactors; and in the biomedical field, cryogenic liquids are used to preserve biological samples.

[0003] Currently, spacecraft typically carry ground-calibrated vacuum infrared standard radiation thermometers or vacuum Fourier transform infrared spectrometers as infrared radiation measuring instruments before launch to meet the needs of aerospace remote sensing in exploring the temperature and material composition of target objects. However, when spacecraft operate in orbit for extended periods, the accuracy of the infrared radiation measuring instruments decreases. In such cases, recalibration is necessary to ensure accurate measurement results. However, existing calibration methods only allow for ground-based calibration of the infrared radiation measuring instruments, which means that the instruments cannot be calibrated during long-term orbital operation, thus affecting the accuracy of measurement results. Utility Model Content

[0004] In view of this, the present invention proposes a device for on-orbit calibration of infrared radiation measuring instruments, enabling spacecraft to perform on-orbit calibration of onboard infrared radiation measuring instruments (such as vacuum infrared standard radiation thermometers or vacuum Fourier transform infrared spectrometers) during long-term on-orbit operation.

[0005] The present invention adopts the following technical solution:

[0006] An apparatus for on-orbit calibration of an infrared radiation measuring instrument, comprising:

[0007] Artificial blackbody: Used to generate thermal radiation of a specified intensity;

[0008] Cooled tube optical path system: used to transmit radiation emitted by an artificial blackbody, including at least one cryogenic cooling device to maintain the low-temperature environment of the optical path system;

[0009] Off-axis ellipsoidal reflector: used to converge and reflect radiation to an infrared radiation measuring instrument;

[0010] Optical path switching mechanism: used to change the position of the off-axis ellipsoidal reflector to switch the optical path between different infrared radiation measuring instruments;

[0011] Control system: capable of controlling the radiation intensity of the artificial blackbody and the operation of the optical path switching mechanism.

[0012] Furthermore, it also includes a motor, which, under the control of the control system, can control the attitude of the infrared radiation measuring instrument, so that the infrared radiation measuring instrument can perform radiation measurement on the target object after calibration.

[0013] Furthermore, the control system is able to transmit calibration data to the spacecraft's central processing system via a data interface.

[0014] Furthermore, the optical path switching mechanism is a magnetic drive mechanism.

[0015] Furthermore, the off-axis ellipsoidal reflector is made of aluminum and has been gold-plated to improve its reflection efficiency.

[0016] Furthermore, the artificial blackbody is a blackbody furnace;

[0017] The infrared radiation measuring instrument includes a vacuum infrared standard radiation thermometer and a vacuum Fourier transform infrared spectrometer.

[0018] Beneficial effects:

[0019] (1) This invention achieves precise calibration of the infrared radiation measuring instrument by integrating an artificial blackbody, a cooling tube optical path system, an off-axis ellipsoidal reflector, an optical path switching mechanism, and a control system, thus solving the problem of reduced measurement accuracy caused by excessive on-orbit time. This on-orbit calibration method avoids the high cost and time consumption of spacecraft returning to Earth for calibration, ensuring the continuity and accuracy of measurement results during spacecraft on-orbit operation, thereby improving the efficiency and reliability of aerospace remote sensing missions.

[0020] (2) By controlling the attitude of the infrared radiation measuring instrument by motor, the radiation measurement of the target object can be carried out after calibration, which increases the flexibility and adaptability of the device and enables the calibrated equipment to be quickly switched to actual measurement tasks.

[0021] (3) The control system can transmit calibration data to the spacecraft’s central processing system through the data interface, enabling centralized management and analysis of the data and improving the efficiency and accuracy of data processing. Attached Figure Description

[0022] Figure 1 A schematic diagram illustrating the composition principle of the device for on-orbit calibration of an infrared radiation measuring instrument provided by this utility model;

[0023] Among them, 1-infrared radiation measuring instrument; 2-cooled tube optical path system; 3-off-axis ellipsoidal reflector; 4-artificial blackbody. Detailed Implementation

[0024] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 As shown, an apparatus for on-orbit calibration of an infrared radiation measuring instrument includes:

[0026] Artificial blackbody 4: used to generate thermal radiation of a set intensity; Cooling tube optical path system 2: used to transmit the radiation emitted by artificial blackbody 4, including at least one cryogenic cooling device to maintain the low-temperature environment of the optical path system; Off-axis ellipsoidal reflector 3: used to converge and reflect radiation to infrared radiation measuring instrument 1; Optical path switching mechanism: used to change the position of off-axis ellipsoidal reflector 3 to switch the optical path between different infrared radiation measuring instruments 1; Control system: capable of controlling the radiation intensity of artificial blackbody 4 and the operation of optical path switching mechanism.

[0027] Thus, by integrating an artificial blackbody 4, a cooling tube optical path system 2, an off-axis ellipsoidal reflector 3, an optical path switching mechanism, and a control system, the device achieves precise calibration of the infrared radiation measuring instrument 1, solving the problem of reduced measurement accuracy caused by excessive on-orbit time. This on-orbit calibration method avoids the high cost and time consumption of spacecraft returning to Earth for calibration, ensuring the continuity and accuracy of measurement results during spacecraft on-orbit operation, thereby improving the efficiency and reliability of space remote sensing missions.

[0028] Specifically, it also includes a motor, which, under the control of the control system, can control the attitude of the infrared radiation measuring instrument 1, enabling the infrared radiation measuring instrument 1 to perform radiation measurements on the target object after calibration. Thus, by controlling the attitude of the infrared radiation measuring instrument 1 with a motor, and enabling radiation measurements on the target object after calibration, the flexibility and adaptability of the device are increased, allowing the calibrated equipment to be quickly switched to actual measurement tasks.

[0029] Specifically, the control system can transmit calibration data to the spacecraft's central processing system via a data interface, enabling centralized management and analysis of the data and improving the efficiency and accuracy of data processing.

[0030] Specifically, the optical path switching mechanism is a magnetic drive mechanism, which can work in an ultra-high vacuum environment, ensuring the reliability of the movement and rotation of the off-axis ellipsoidal reflector 3 in a vacuum environment, and improving the stability and durability of the device in special environments.

[0031] Specifically, the off-axis ellipsoidal reflector 3 is made of aluminum and has been gold-plated to improve reflection efficiency and enhance the accuracy of radiation measurements.

[0032] As an example, in this embodiment, the artificial blackbody 4 is a blackbody furnace; the infrared radiation measuring instrument 1 includes a vacuum infrared standard radiation thermometer and a vacuum Fourier transform infrared spectrometer. The off-axis ellipsoidal reflector 3 is made of high-purity aluminum with a diameter of 170mm and a thickness of 35mm, and is machined by single-point diamond turning. The back is stress-relieved. The two focal lengths of the off-axis ellipsoidal reflector 3 are 1200mm and 2400mm, respectively, with an included angle of 40°.

[0033] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An apparatus for in-orbit calibration of an infrared radiometer, characterized by, The application relates to a blackbody radiation calibration system for infrared radiation measurement instruments, which comprises the following parts: a blackbody for generating blackbody radiation of a set intensity; a cooled tube optical path system for transmitting the blackbody radiation, which comprises at least one low-temperature refrigerating device for maintaining a low-temperature environment of the optical path system; an off-axis ellipsoidal reflector for converging and reflecting the radiation to an infrared radiation measurement instrument; an optical path switching mechanism for changing the position of the off-axis ellipsoidal reflector and switching the optical path between different infrared radiation measurement instruments; a control system capable of controlling the radiation intensity of the blackbody and the action of the optical path switching mechanism.

2. A device for in-orbit calibration of an infrared radiometer according to claim 1, characterized in that, The application also comprises a motor capable of controlling the posture of the infrared radiation measurement instrument under the control of the control system, so that the infrared radiation measurement instrument can be used for radiation measurement of a target object after calibration.

3. The device for in-orbit calibration of an infrared radiometer according to claim 1, characterized in that, The control system can transmit calibration data to a central processing system of a spacecraft through a data interface.

4. The device for in-orbit calibration of an infrared radiometer according to claim 1, characterized in that, The optical path switching mechanism is a magnetic transmission mechanism.

5. The device for in-orbit calibration of an infrared radiometer according to claim 1, wherein The off-axis ellipsoidal reflector is made of aluminum and is subjected to surface gold plating treatment, so as to improve the reflection efficiency.

6. A device for in-orbit calibration of an infrared radiometer according to any one of claims 1 to 5, characterized in that, The blackbody is a blackbody furnace. The infrared radiation measurement instrument comprises a vacuum infrared standard radiation thermometer and a vacuum Fourier infrared spectrometer.

Images