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Absolute radiometer for solar irradiance calibration and radiometer internal thermal structure

A technology of absolute radiation and solar radiation, applied in the field of remote sensor on-orbit light radiation measurement, can solve the problems of limited processing technology, the contact between the absorption cavity and the thermopile cannot meet the accuracy requirements of the absolute radiometer, and reduce the time constant. , The temperature collection method is designed reasonably and the effect of speeding up the transfer efficiency

Active Publication Date: 2016-12-21
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problem that the existing thermal structure used on the absolute radiometer is a cavity structure with a positive conical cavity with a cylindrical side. Due to the limited processing technology, the contact between the absorption cavity and the thermopile cannot meet the accuracy requirements of the absolute radiometer. to provide an absolute radiometer for solar irradiance calibration and the internal thermal structure of the radiometer

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  • Absolute radiometer for solar irradiance calibration and radiometer internal thermal structure
  • Absolute radiometer for solar irradiance calibration and radiometer internal thermal structure

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specific Embodiment approach 1

[0014] Specific implementation mode 1. Combination figure 1 and figure 2 Describe this embodiment, the absolute radiometer used for solar irradiance calibration includes: stray light stop 6, motor 7, main stop 8, internal thermal structure of the radiometer, reference cavity 5, and 38-pin plug 10 . The internal thermal structure of the radiometer is as follows: figure 1 Including: pressing plate 1, polyimide gasket 2, thermopile 3, heat sink 4 and absorption chamber 5. The absorption cavity is embedded with a heating wire for electric heating in the light radiation area. In the electric heating stage, the cone cavity is heated by the electric heating wire to achieve the equivalent of light heating. The inside of the absorption cavity 5 is coated with a mirror reflective paint . The reference chamber 9 is connected back to back with the absorption chamber 5 . The heat sink 4 is used to package the reference cavity 9 and the absorption cavity 5; the absorption cavity 5 ado...

specific Embodiment approach 2

[0016] Specific embodiment two, combine figure 1 In this embodiment, the internal thermal structure of the absolute radiometer used for solar irradiance calibration includes a pressing plate 1, a polyimide gasket 2, a thermopile 3, a heat sink 4, and an absorption cavity 5; the absorption cavity 5. A heating wire for electric heating is embedded in the light radiation area. In the electric heating stage, the electric heating wire is used to heat the absorption cavity 5 to achieve the equivalent of light heating. The interior of the absorption cavity 5 is coated with mirror-reflective paint. The reference chamber 9 is connected back to back with the absorption chamber 5 . The heat sink 4 is used to package the reference cavity 9 and the absorption cavity 5 ; the material of the pressing sheet 1 is aluminum, which plays a role of fixing the absorption cavity 5 . The material of the polyimide gasket 2 is polyimide, which plays a role of isolating heat transfer in this direction....

specific Embodiment approach 3

[0018] Specific embodiment three, this embodiment is the method for designing the thermal structure on the absolute radiometer for on-orbit solar irradiance calibration described in specific embodiment two, and this method is realized by the following steps:

[0019] 1. Establishing a 3D model: The engineering software Soliderworks is used for modeling, and the model is established by using the method of matrix rotation. The central angle α of the absorption cavity 5 is 30°, and the inner wall thickness is 0.1 mm. The outer diameter of the visor is determined according to the shape of the thermal link, that is, the radius of the visor should be similar to the radius of the thermopile ring, so that the visor can be better connected with the thermopile and maintain thermal contact. After the two-dimensional sketch is established, rotate along the centerline of the absorption cavity to obtain the required three-dimensional model of the absolute radiometer absorption cavity. Usin...

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Abstract

An absolute radiometer for solar irradiance calibration and a radiometer internal thermal structure are disclosed and relate to the field of remote sensor on-orbit optical radiation measurement. The absolute radiometer for solar irradiance calibration and the radiometer internal thermal structure can help solve a problem that while a conventional thermal structure applied to the absolute radiometer is a normal cone cavity structure having a cylinder side face, contact between an absorption cavity and a thermopile can meet precision requirement for the absolute radiometer due to limitation of processing technologies. The absolute radiometer comprises the radiometer internal thermal structure; the radiometer internal thermal structure comprises a pressing sheet, a polyimide gasket, the thermopile, a heat sink ant the absorption cavity; the absorption cavity adopts the normal cone cavity structure having a hat brim, an inner wall is coated with a mirror surface reflecting layer, and the absorption cavity has a 30 degree central angle. An upper top face of the thermopile is connected with the hat brim of the absorption cavity, a lower bottom face is connected with the heat sink, and thermoelectric effects are used for collecting temperature difference between the heat sink and the absorption cavity. Connection parts of all assemblies are connected with each other via epoxy resin glue, a time constant of an optical radiation measurement experiment for the absolute radiometer is markedly reduced, and utilizability of solar irradiance on-orbit measurement data can be improved.

Description

technical field [0001] The invention relates to the field of on-orbit optical radiation measurement of remote sensors, in particular to an absolute radiometer used for solar irradiance calibration and an internal thermal structure of the radiometer. Background technique [0002] The absolute radiometer is the main monitoring instrument for measuring total solar irradiance and has been developed for more than 50 years as a benchmark for optical radiation measurement. It belongs to the electric substitution radiometer. The principle is to reproduce the measured optical power with the equivalent electric power, and the power value of the electric power is the measured value of the optical power. During electrical substitution, the response time of absolute radiometer photoradiometric experiments is critical. For example, the solar irradiance absolute radiometer developed by Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences is equipped with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/04
CPCG01J1/04
Inventor 王凯唐潇方伟王玉鹏
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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