CN-122016054-A - Infrared radiation scanning comparison and magnitude traceability system in vacuum low-temperature environment

CN122016054ACN 122016054 ACN122016054 ACN 122016054ACN-122016054-A

Abstract

The invention provides an infrared radiation scanning comparison and magnitude tracing system in a vacuum low-temperature environment, wherein a scanning mechanism, an optical system, a cold trap, a modulator, a diaphragm, a cold screen and an infrared detector assembly are all positioned in a stray radiation suppression system, the scanning mechanism is used for scanning a measured target, a calibration source is used for realizing calibration and magnitude tracing in a radiometer measuring process, the optical system is used for converging infrared radiation of the measured target and projecting the infrared radiation onto the modulator, the cold trap provides a measuring reference for the system, the diaphragm is positioned between the modulator and the infrared detector assembly, the cold screen is positioned in front of the infrared detector assembly, and a phase-locked amplifier is used for outputting to a data acquisition processing and controller according to signal processing of the infrared detector assembly and the modulator. The invention can solve the technical problems that the high-precision measurement of the infrared radiation magnitude and the magnitude tracing under the high-low temperature environment condition cannot be realized in the prior art.

Inventors

ZHANG YUGUO
GUO YAPIN
LI SHIWEI
ZHANG XIN
WU HONGXIA
SUN HONGSHENG
WANG JIAPENG
DU JIDONG
SUN GUANGWEI
QIU CHAO
YU HONGYU
Yu Changben
Zhai Siting

Assignees

北京振兴计量测试研究所

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (10)

1. The infrared radiation scanning comparison and magnitude tracing system in the vacuum low-temperature environment is characterized by comprising a scanning mechanism, a calibration source, a cold trap, an optical system, a modulator, a diaphragm, a cold screen, an infrared detector component, a stray radiation suppression system, a lock-in amplifier and a data acquisition processing and controller, The scanning mechanism is used for scanning the tested object, so that different light rays of the tested object enter the optical system; the calibration source is used for realizing calibration and magnitude tracing in the radiometer measurement process; the optical system is used for converging infrared radiation of the detected target and then projecting the infrared radiation onto the modulator; The cold trap is a variable-temperature reference blackbody and is used for providing a measurement standard for the system and realizing timing calibration; The modulator is used for modulating infrared radiation of the detected target, so that the radiation of the detected target and the radiation of the reference blackbody are alternately projected to the infrared detector assembly; The diaphragm is positioned between the modulator and the infrared detector assembly and is used for eliminating the influence of self radiation and stray light on measurement; the cold screen is positioned in front of the infrared detector assembly and is used for eliminating ambient stray light near the detector assembly; The infrared detector component is used for converting the modulated infrared radiation into an electric signal and transmitting the electric signal to the lock-in amplifier; The phase-locked amplifier is used for outputting the data to the data acquisition processor and the controller according to the signal processing of the infrared detector component and the modulator; the scanning mechanism, the optical system, the cold trap, the modulator, the diaphragm, the cold screen and the infrared detector assembly are all located inside a stray radiation suppression system, and the stray radiation suppression system is used for refrigerating all parts inside to low temperature, suppressing ambient stray light and eliminating stray radiation interference.
2. The infrared radiation scanning comparison and magnitude tracing system under vacuum low temperature environment according to claim 1, wherein the scanning mechanism adopts a two-dimensional scanning reflector, the reflector is positioned in the light path, the substrate material is a low temperature optical system material, and the surface is plated with a high reflection film of a corresponding wave band.
3. The infrared radiation scanning comparison and magnitude tracing system under the vacuum low-temperature environment according to claim 1, wherein the variable-temperature reference blackbody comprises a radiation surface, a heating layer, a refrigerating layer and a temperature measuring sensor, the radiation surface is coated with high-emissivity super-black materials, a refrigerator is arranged in the refrigerating layer and is refrigerated by liquid nitrogen, the heating layer comprises a heating plate and a heat conducting filler, and the heat conducting filler or the heat insulating filler is arranged between the heating layer and the refrigerating layer.
4. The infrared radiation scanning comparison and magnitude tracing system under a vacuum low-temperature environment according to claim 1, wherein the optical system comprises a main reflector body, a refrigerator and a heat conducting filler, wherein the main reflector body is fixed in a mode of adding ring-coated low-temperature silicon rubber in a clearance fit manner or adopts full-aluminum integrated addition.
5. The system of claim 4, wherein the optical system further comprises an optical filter, a neutral attenuation sheet and a spectrum correction sheet, the three optical lenses are mounted on respective card-shaped mechanisms, and any optical lens mounted on the card-shaped mechanisms can be inserted into or removed from the optical path by the movement of the card-shaped mechanisms so as to adapt to different measurement requirements.
6. The infrared radiation scanning comparison and magnitude tracing system under the vacuum low-temperature environment according to claim 1, wherein a motor of the modulator utilizes refrigerating fluid for refrigeration, a plurality of layers of heat insulation materials and heating plates are firstly coated outside the motor, a heat control design is realized in a mode of active and passive combination, and liquid nitrogen is utilized for refrigeration and isolation outside, and stray light is restrained.
7. The infrared radiation scanning comparison and magnitude tracing system under the vacuum low-temperature environment according to claim 1, wherein the diaphragm adopts a double-layer structure, high-emissivity coatings are sprayed on the inner surface and the outer surface of the diaphragm, and low-temperature refrigerating fluid is filled in the diaphragm.
8. The infrared radiation scanning comparison and magnitude tracing system under vacuum low temperature environment according to claim 1, wherein said infrared detector is a unit infrared refrigeration detector with a preamplifier, and amplified signals are inputted to said lock-in amplifier.
9. The infrared radiation scanning comparing and magnitude tracing system under vacuum low temperature environment according to any one of claims 1 to 8, wherein the phase-locked amplifier is a low noise narrow band amplifier, the circuit comprises a filter, a phase shifter, a phase sensitive detector, a low pass filter and an amplifier, the output signal of the signal amplifying circuit of the infrared detector is used as the input signal of the phase-locked detecting circuit, the output signal of the modulator control circuit is used as the synchronous reference signal of the phase-locked detecting circuit, and the signal processed by the detector is processed by the low pass filter and the amplifier to finally obtain a direct current output signal proportional to the input signal.
10. The infrared radiation scanning comparison and magnitude tracing system under a vacuum low temperature environment according to any one of claims 1 to 9, wherein the stray radiation suppression system comprises an integral housing, the integral housing is of a 5-layer structure, and comprises a refrigeration dewar layer (liquid nitrogen layer), a heat insulation layer, a vacuum layer, a heat insulation layer and a housing layer from inside to outside in sequence, wherein the integral housing is provided with a low temperature gas inlet and outlet, an electrical interface and a liquid nitrogen inlet and outlet.

Description

Infrared radiation scanning comparison and magnitude traceability system in vacuum low-temperature environment Technical Field The invention belongs to the technical field of infrared radiation measurement, and particularly relates to an infrared radiation scanning comparison and magnitude tracing system in a vacuum low-temperature environment. Background The infrared imaging detection technology can adapt to complex electromagnetic environment, has strong accurate striking capability, can identify deformed, camouflaged and coated targets, and has all-weather use capability, so that the infrared imaging detection technology is widely applied in the field of national defense, wherein space remote sensing and detection are important application fields of the infrared thermal imaging part components, and in order to ensure the working reliability of the infrared thermal imaging part components, the infrared imaging detection technology meets quantitative detection indexes and needs performance test and magnitude tracing of the infrared thermal imaging part components in a vacuum low-temperature environment. Because of the stray radiation in the vacuum low-temperature environment, the measurement accuracy is seriously affected, so that the whole system is subjected to extremely low-temperature refrigeration, a high-emissivity coating is sprayed on the surface, the influence of the stray radiation is avoided, and meanwhile, the special technical means are combined, so that the measurement accuracy requirement is met. At present, no equipment in China can realize high-precision measurement of infrared radiation magnitude under high and low temperature environment conditions, and the equipment also does not have magnitude traceability, and belongs to the blank field. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. The invention provides an infrared radiation scanning comparison and magnitude tracing system in a vacuum low-temperature environment, which comprises a scanning mechanism, a calibration source, a cold trap, an optical system, a modulator, a diaphragm, a cold screen, an infrared detector component, a stray radiation suppression system, a lock-in amplifier and a data acquisition processing and controller, The scanning mechanism is used for scanning the tested object, so that different light rays of the tested object enter the optical system; The calibration source is used for realizing calibration and magnitude tracing in the radiometer measurement process; the optical system is used for converging infrared radiation of the measured target and then projecting the infrared radiation onto the modulator; the cold trap is a variable-temperature reference blackbody and is used for providing a measurement standard for the system and realizing timing calibration; The modulator is used for modulating the infrared radiation of the detected target, so that the radiation of the detected target and the reference blackbody is alternately projected to the infrared detector assembly; The diaphragm is positioned between the modulator and the infrared detector component and is used for eliminating the influence of self radiation and stray light on measurement; the cold screen is positioned in front of the infrared detector assembly and is used for eliminating ambient stray light near the detector assembly; The infrared detector component is used for converting the modulated infrared radiation into an electric signal and transmitting the electric signal to the lock-in amplifier; the phase-locked amplifier is used for outputting to the data acquisition processor and the controller according to the signal processing of the infrared detector component and the modulator; The scanning mechanism, the optical system, the cold trap, the modulator, the diaphragm, the cold screen and the infrared detector assembly are all located inside the stray radiation suppression system, and the stray radiation suppression system is used for refrigerating all parts inside to low temperature, suppressing ambient stray light and eliminating stray radiation interference. Further, the scanning mechanism adopts a two-dimensional scanning reflector, the reflector is positioned in the light path, the substrate material is a low-temperature optical system material, and the surface of the substrate material is plated with a high-reflection film with corresponding wave bands. The temperature-changing reference blackbody comprises a radiation surface, a heating layer, a refrigerating layer and a temperature measuring sensor, wherein the radiation surface is coated with a high-emissivity super-black material, a refrigerator is arranged in the refrigerating layer and is refrigerated by liquid nitrogen, the heating layer comprises a heating plate and a heat-conducting filler, and the heat-conducting filler or the heat-insulating filler is arranged between the heating layer and the