Spectral absorption rate measuring device and method of black body cavity

Abstract

The invention discloses a spectral absorption rate measuring device and method of a black body cavity. The measuring device comprises a light source, a monochromator, a beam collimation system, a beamsplitter, a first trap detector, an integrating sphere, a second trap detector, a black body cavity, a standard whiteboard, an electrically controlled translation bench, a controller, and a signal amplifier, a six-and-a-half voltmeter and an industrial personal computer. According to the invention, an LDLS laser driving type light source and a monochromator are used for replacing the laser deviceto serve as a black body cavity spectral absorption rate measuring light source; and the absorption rate under the single wavelength point in the traditional measuring method can be extended to a special absorption rate under the broad band of 170nm to 2100nm. The Si / InGaAs trap detector is used for replacing the Si / InGaAs detector based on the traditional method, so that the influence on the measuring result by factors like an incident angle of incident light and a polarization degree is reduced and the measurement uncertainty is improved. The spectral absorption rate measuring mechanical device of a black body cavity is built by using the black body cavity clamp and the electrically controlled translation bench, so that the influence on the measuring result by the spatial position errorof the black body cavity during multiple times of measurement is reduced.

Description

technical field [0001] The invention relates to a device and method for measuring the spectral absorptivity of a blackbody cavity. Background technique [0002] The cryogenic radiometer is currently the highest benchmark for absolute measurement of optical power in the world. It uses the electrical substitution measurement principle under low-temperature superconductivity to trace the source of optical radiation measurement to the measurement of electrical parameters that can be accurately measured, and obtain the absolute power value of optical radiation. Measurement benchmark, the measurement uncertainty can reach 10 -5 It has played an important role in the measurement of optical radiation in the fields of "high score", "missile guidance" and "earth observation and navigation". At present, leading international metrology institutions represented by the National Metrology Standards Laboratory (NIST), the National Institute of Physics (NPL) and the German Federal Institute...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to propose a blackbody cavity spectral absorptivity measurement device to solve the problem of blackbody absorption cavity wide band (170nm-2100nm) and high stability spectral absorptivity measurement

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