Blackbody cavity of low-temperature radiometer

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...

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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 coincides, and the generatrix of the right cone forms an included angle (1) with the axis of the right cone; the thin end of the right cone is provided with a cavity incident aperture ( 7), the plane where the cavity incident aperture (7) is located is perpendicular to the axis (3) of the right cone; the angle (2) is formed between the inclined bottom surface (4) and the axis (3) of the cylinder

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