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Low-temperature radiometer black cavity light beam alignment device and method

A technology of low-temperature radiation and alignment device, which is applied in the direction of photometry, measurement device, photometry, etc. using electric radiation detectors, which can solve the problems of difficulty in accurate quantitative adjustment of blackbody cavity optical radiation alignment, etc.

Inactive Publication Date: 2019-03-22
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

At present, there are the following problems in the beam alignment of the blackbody cavity of the low temperature radiometer: (1) whether the light radiation is incident on the center of the aperture plane of the blackbody cavity;

Method used

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  • Low-temperature radiometer black cavity light beam alignment device and method
  • Low-temperature radiometer black cavity light beam alignment device and method

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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a low-temperature radiometer blackbody cavity beam alignment device includes an off-axis parabolic mirror 2, an off-axis parabolic mirror base 3, a low-temperature radiometer blackbody cavity 4, a four-quadrant detector 7 and a thermal insulation base 8; wherein, The off-axis parabolic mirror 2 is installed on the off-axis parabolic mirror base 3, the mirror surface center of the off-axis parabolic mirror 2 is provided with an off-axis parabolic mirror center hole 5, and the off-axis parabolic mirror 2 is coaxially installed with the cryogenic radiometer black body cavity 4, and The two are placed close to each other, the four-quadrant detector 7 is installed on the heat insulation base 8, the reflection focus of the off-axis parabolic mirror 2 is located on the photosensitive surface of the four-quadrant detector 7, and the four-quadrant detector 7 is connected to the four-way DC amplifier 9;

[0031] The central hole 5 of the off-axis parabo...

Embodiment 2

[0037] On the basis of the above-mentioned embodiment 1, the present invention also mentions a low-temperature radiometer blackbody cavity beam alignment method, the specific process is as follows: After the spatially filtered and collimated laser beam passes through the Brewster window, The axis 1 of the off-axis parabolic mirror is horizontally incident, passes through the central hole 5 of the parabolic mirror, and enters the low-temperature radiometer black body cavity 4, and the axis of the off-axis parabolic mirror is coaxially installed with the low-temperature radiometer black body cavity 4; the stray light of the laser beam is incident on the off-axis parabola Reflecting surface of the mirror 2; reflected by the off-axis parabolic mirror 2, after focusing, it is incident on the center position of the four-quadrant detector 7 placed on the heat-insulating base 8, and the four-quadrant detector 7 is connected to the four-way DC amplifier 9 , for each quadrant output elec...

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Abstract

The invention discloses a low-temperature radiometer black cavity light beam alignment device and method and belongs to the field of light radiation power measurement. The device includes an off-axisparaboloidal mirror, an off-axis paraboloidal mirror base, a low-temperature radiometer black cavity, a four-quadrant detector, a direct-current amplifier and a thermal insulation base. The off-axis paraboloidal mirror is mounted on the off-axis paraboloidal mirror base; the center of the mirror surface of the off-axis paraboloidal mirror is provided with an off-axis paraboloidal mirror central hole; the off-axis paraboloidal mirror is coaxially mounted with the low-temperature radiometer black cavity and closely fits the low-temperature radiometer black cavity, and the four-quadrant detectoris mounted on the thermal insulation base. Since the off-axis paraboloidal mirror is coaxially mounted with the low-temperature radiometer black cavity, when a light beam is adjusted to the center ofthe mirror surface of the off-axis paraboloidal mirror, it can be ensured to the maximum degree that the light beam can be maintained at the axial position of the low-temperature radiometer black cavity and normal incidence of the light beam is achieved; a laser beam entering a low-temperature radiometer is a linearly polarized collimated light beam which is subjected to spatial filtering, so thatthe quality of the light beam is excellent, and there is less stray light.

Description

technical field [0001] The invention belongs to the field of optical radiation power measurement, and in particular relates to a low-temperature radiometer black body cavity light beam alignment device and alignment method. Background technique [0002] The cryogenic radiometer is currently the highest measurement benchmark for optical radiation power measurement internationally recognized. Using low temperature, vacuum and superconducting technologies, the measurement of optical radiation power is completely equivalent to electrical power measurement, and its measurement uncertainty is better than 10 -5 order of magnitude. It has played a fundamental and key role in the fields of space payloads, remote sensing imaging, climate change, and environmental monitoring. [0003] Measurement techniques based on electrical substitution were proposed around 1891 for the verification of Planck's law. In the 1990s, international metrology institutions such as NPL in the United Kingd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/04G01J1/42
CPCG01J1/0411G01J1/42
Inventor 刘红博史学舜庄新港刘长明张鹏举
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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