Blackbody cavity of low-temperature radiometer

A technology of low-temperature radiation and black body cavity, which is applied in the field of optical radiation measurement, can solve the problem of low spectral absorption rate, achieve good absorption characteristics, improve thermal conductivity, and reduce uncertainty

Active Publication Date: 2017-05-31
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

[0005] In order to solve the problem of low spectral absorptivity in the prior art under the condition of limited cavity length, the present invention provides a low-temperature radiometer black body cavity, which comprises a positive conical side (6), a cylindrical side (5), and an inclined bottom ( 4) the cavity formed by connecting, the axis (3) of the right cone and the cylinder coinci

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  • Blackbody cavity of low-temperature radiometer

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Embodiment 1

[0026] Such as figure 1 As shown, the low-temperature radiometer black body cavity of the present embodiment includes a cavity composed of a positive conical side 6, a cylindrical side 5, and an inclined bottom 4. The axis of the cone forms an angle 1 of 45°; the thin end of the right cone is provided with a cavity incident aperture 7, and the plane where the cavity incident aperture 7 is located is perpendicular to the axis 3 of the positive cone; the axis 3 between the inclined bottom surface 4 and the cylinder The angle 2 formed between them is 30°.

[0027] The positive conical side 6 forms a light-shielding design, which can be used as a diaphragm of the cavity entrance aperture 7, blocking the stray light outside the cavity from entering, and reflecting the light emitted to the exit back into the cavity again; the inclined bottom surface 4 can effectively increase the number of surface reflections; The combination of the two can effectively reduce the diffuse reflection...

Embodiment 2

[0033] This embodiment is the manufacturing method of the low temperature radiometer black body cavity of embodiment 1, comprising the following steps:

[0034] S1: A cylindrical cavity with a cavity wall thickness of 0.1 mm is produced by a precision machining process, cut at one end of the cylindrical cavity to form a cutting surface with an angle of 30° with the axis of the cylinder, and obtain the side surface 5 of the cylinder;

[0035] S2: Make a positive conical side with a cavity wall thickness of 0.1mm and an apex angle of 45°, cut at the thick end of the normal cone to obtain a cutting surface with the same diameter as the cylindrical cavity, and cut at the thin end of the normal cone to obtain a cavity with an incident diameter of 7 , to ensure that the cutting surface is perpendicular to the axis of the cone, and the side surface 6 of the right cone is obtained;

[0036] S3: according to the geometric parameters of the cylindrical cavity cutting surface, make the c...

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Abstract

The invention relate to the field of optical radiation measurement, in particular to a blackbody cavity of a low-temperature radiometer. The blackbody cavity comprises a cavity body formed by a regular cone side face (6), a cylinder side face (5) and an oblique bottom face (4). The axes (3) of the regular cone and the cylinder coincide with each other. An included angle (1) is formed between a generatrix of the regular cone and the axis of the regular cone. A cavity incidence bore (7) is formed in the thin end of the regular cone. The plane where the cavity incidence bore (7) is located is perpendicular to the axis (3) of the regular cone. An included angle (2) is formed between the oblique bottom face (4) and the axis of the cylinder. According to the invention, by adopting a cavity body structure combining the oblique bottom, the cylinder and the cone, through the conical light shielding design, stray light outside the cavity body can be blocked and reflection light in the cavity body are prevented from overflowing the cavity body; and the coating layer of the inner wall of the cavity body is made of pure specular reflection graphene materials, so diffusion reflection of light radiation in the cavity can be reduced; temperature distribution is relatively centralized; and temperature response speed is fast.

Description

technical field [0001] The invention relates to the field of optical radiation measurement, in particular to a low-temperature radiometer black body cavity. Background technique [0002] The cryogenic radiometer is currently the measurement standard with the highest precision and the widest spectral detection range in terms of optical radiation power measurement. It uses low temperature, vacuum and superconducting technologies to completely equivalent optical radiation heating measurement to electrical power measurement, and its measurement uncertainty is excellent. at 10 -5 It has played a fundamental and key role in the fields of remote sensing calibration, climate change, environmental monitoring, and optical radiation measurement. [0003] Since the 1990s, NPL in the United Kingdom and NIST in the United States have successively developed low-temperature radiometers, established the basic standard for optical radiation power measurement, and carried out a large number o...

Claims

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Application Information

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IPC IPC(8): G01J5/02
CPCG01J5/0225
Inventor 刘红博史学舜刘玉龙刘长明赵坤陈海东
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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