A test integrated device and test method for cryogenic radiometer

A low-temperature radiation and testing method technology, applied in the field of low-temperature radiometers, can solve the problems of low testing accuracy and complex structure, and achieve the effects of eliminating poor testing accuracy, high testing accuracy and improving detection accuracy.

Active Publication Date: 2021-07-27
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that the Brewster window transmittance testing device, the beam alignment device and the stray light testing device are separated from each other in the current cryogenic radiometer testing system, the structure is complex and the testing accuracy is low, the first purpose of the present invention is to provide a A test integrated device for low temperature radiometer

Method used

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  • A test integrated device and test method for cryogenic radiometer
  • A test integrated device and test method for cryogenic radiometer
  • A test integrated device and test method for cryogenic radiometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] combine figure 1 and figure 2 , a test integrated device for low temperature radiometer, comprising a main cylinder 1, the upper part of the main cylinder 1 is provided with a Brewster window transmittance test window 2 and a stray light test window 3, and the lower part of the main cylinder 1 is provided with A four-quadrant detector is installed with a vacuum flange 4 , and an off-axis parabolic mirror 5 is arranged inside the main cylinder.

[0045] The front end of the main cylinder body 1 is connected with a front end vacuum flange 6 , and the rear end of the main cylinder body 1 is connected with a rear end vacuum flange 7 .

[0046] Brewster window transmittance test window 2, stray light test window 3 and four-quadrant detector mounting vacuum flange 4 are all communicated with the main cylinder.

[0047] The side of the four-quadrant detector mounting vacuum flange 4 is provided with an aviation plug interface 8, the bottom of the four-quadrant detector moun...

Embodiment 2

[0054] A method for aligning and debugging an incident beam of a cryogenic radiometer, using the test integrated device for a cryogenic radiometer described in Embodiment 1.

[0055] The method includes the following steps:

[0056] Step 1: Complete the spatial filtering and stable power control of the incident light, open the cold shields of the cryogenic radiometer at all levels, remove the black body cavity of the cryogenic radiometer, and adjust the direction of the incident light to allow the incident light to pass through the center of the black body cavity mount.

[0057] Step 2: Reassemble the black body cavity and the cold shields of the cryogenic radiometer at all levels, and install the rear vacuum flange 7 with the light-through holes of the outer shielding cover of the cryogenic radiometer through the vacuum baffle valve.

[0058] Step 3: Observe whether the incident light passes through the center of the central through hole of the off-axis parabolic mirror 5, if...

Embodiment 3

[0062] After completing the alignment of Example 2, a Brewster window transmittance test was performed.

[0063] combine image 3 , a low temperature radiometer Brewster window transmittance test method, comprising the following steps:

[0064] Step 1: Install Brewster Window 14 on Front Vacuum Flange.

[0065] Step 2: A two-dimensional electric translation stage is installed on one side of the test integrated device, a photodetector 15 is arranged on the two-dimensional electric translation stage, and the photodetector can move on the two-dimensional electric translation stage.

[0066] Step 3: The photodetector extends into the transmittance test window of the Brewster window, and the inclination angle of the Brewster window and the polarization state of the incident light are adjusted until the optimum transmittance value of the Brewster window is obtained.

[0067] Step 4: The photodetector first tests the optical power value P at the front of the Brewster window 1 , af...

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Abstract

The invention discloses a low-temperature radiometer test integration device and a test method. The device is a compact integrated device that integrates Brewster window transmittance, beam alignment device installation and debugging, and stray light test functions. The device has simple structure and high testing precision. Compared with the existing device for testing Brewster window transmittance using two detectors, the design of the present invention uses an electronically controlled translation stage and the same detector for Brewster window transmittance testing, which is beneficial to eliminate Response differences between different detectors improve detection accuracy. The present invention proposes to use the method of detecting the transmittance of off-axis parabolic mirrors to indirectly detect the optical power of stray light, which is beneficial to eliminate the stray light around the four-quadrant detector and the detection accuracy of the detector for extremely weak light power caused by the poor accuracy of the stray light test. question.

Description

technical field [0001] The invention relates to the field of low temperature radiometers, in particular to a test integration device and a test method for low temperature radiometers. Background technique [0002] The low temperature radiometer utilizes the measurement principle of the electrical calibration method in the low temperature superconducting environment, and is the current international optical radiation power measurement benchmark. In order to reduce the inequivalence of photoelectric heating, the optical radiation absorption cavity of the cryogenic radiometer is placed in a vacuum radiation shielding layer with a temperature close to the temperature of liquid helium, and a Brewster window is set on the shielding layer for incident light to enter the absorption cavity. . Using the relationship between the reflection characteristics of the Brewster window and the polarization characteristics of the laser beam, the linearly polarized incident light perpendicular ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/02
CPCG01J1/0295
Inventor 庄新港史学舜刘红博张鹏举刘长明王恒飞
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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