Low-temperature absolute radiometer absolute spectral responsivity calibration method and experimental apparatus

Abstract

The invention discloses a low-temperature absolute radiometer absolute spectral responsivity calibration method and an experimental apparatus. The experimental apparatus mainly comprises a main light path unit, a swing module unit, a low-temperature absolute radiometer, a detector vacuum chamber and a main control computer. The method includes the steps that a standard transmission detector and the low-temperature absolute radiometer are placed in the same vacuum environment and driven and controlled by an arc-shaped guide rail so that the low-temperature absolute radiometer and the standard transmission detector can pass through the same light path transmission path, the received incident light powers are completely the same, therefore, the influence of uncertainty in the process of measurement of window transmittance is eliminated, accuracy in the standard transmission process of the low-temperature absolute radiometer will be greatly improved, and the high-precision calibration of the absolute spectral responsivity of the standard transmission detector in the range between the ultraviolet band and the infrared band is achieved.

Description

technical field [0001] The invention relates to the fields of remote sensing science and optical radiation measurement, in particular to a method for calibrating the absolute spectral responsivity of a low-temperature absolute radiometer and an experimental device. Background technique [0002] The cryogenic absolute radiometer is currently the most accurate measurement standard for optical radiation power measurement. It utilizes low temperature, vacuum and superconducting technologies to completely equate optical radiation heating measurement to electrical power measurement, and its measurement accuracy has reached better than 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] In recent years, developed countries led by the United States have carried out a large number of basic experimental research and technology integration for cryogenic absolute...

AI Technical Summary

Problems solved by technology

The main problems with this method are: (1) The low temperature absolute radiometer needs to adjust the Brewster angle in each working band, and the adjustment accuracy is poor; (2) When the window is removed from the low temperature absolute radiometer, its reset has It is more difficult, and the angle of window reset and the position of the light spot are difficult to guarantee to be exactly the same as those on the cryogenic absolute radiometer

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