Calibration method for blackbody cavity absorption coefficient under variable temperature condition

Abstract

The invention belongs to the field of optical metrology testing, and discloses a blackbody cavity absorption coefficient calibration method under a variable temperature condition, which comprises the following steps of: generating uniform monochromatic radiation by using a high-stability radiation source in combination with a stable power instrument, receiving the monochromatic radiation by a blackbody cavity to be tested, and measuring the absorption coefficient of the blackbody cavity by adding an inverted photoelectric detector in front of a Brewster window. And the reflected light beam intensity is calibrated, so that the full-temperature-section calibration of the blackbody cavity absorption coefficient is realized. According to the method, aiming at the verification problem of blackbody cavity absorption coefficient drift caused by current temperature fluctuation, a variable-temperature cavity-detector integrated test means is innovatively introduced, the measurement of the full-band absorption coefficient of the cavity in a variable-temperature environment is realized, and the method has the characteristics of small size, high calibration accuracy and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of optical metrology and testing, and relates to a method for calibrating the absorption coefficient, in particular to a method for calibrating the absorption coefficient of a black body cavity under variable temperature conditions. Background technique [0002] Absolute low temperature radiometer is a high-precision optical power measuring instrument integrating light, mechanics, electricity and calculation, involving optical design simulation, optical process design, precision optical component manufacturing, precision machining, photoelectric system integration and precision assembly, Technical research in various fields such as precision temperature measurement and control, vacuum technology, refrigeration technology, superconducting technology, automatic control, etc., research and construction of an optical radiation measurement system based on a low temperature radiometer, not only enables the measurem...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to develop a measurement technology based on flip-chip photodetectors to solve the problem of blackbody cavity absorption coefficient drift caused by temperature fluctuation and the technical problem of lack of real-time monitoring technology for blackbody cavity absorptivity. The power escaped from the absorption cavity is monitored to achieve accurate calibration of the absorption coefficient of the blackbody cavity

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