Conic cavity water bath black body source originated from absolute low temperature radiometer and its calibration method

Abstract

The present invention discloses one kind of conic cavity water bath black body source originated from absolute low temperature radiometer and its calibration method. The black body source includes a conic cavity of 36 deg cone angle, a constant temperature water bath, and a cylindrical cavity connected to the front end of the conic cavity, and both the conic cavity and the cylindrical cavity have black inner wall. The calibration method includes the first infrared light power standard transmission based on absolute low temperature radiometer to make the power standard originated from absolute low temperature radiometer; and the subsequent setting one new optical path with increased precise diaphragm and light filter before the infrared power standard transmission detector, so as to make the infrared standard radiation brightness meter originated from absolute low temperature radiometer.

Description

technical field [0001] The invention belongs to an optical radiation measurement method and equipment, in particular to a high-precision tapered cavity water-bath blackbody source traceable from an absolute low temperature radiometer and a method for calibrating its radiance by using the absolute low temperature radiometer. Background technique [0002] The application of remote sensing satellites is getting deeper and deeper into all aspects of social life. At present, many remote sensing satellites that have been launched or will be launched in my country are equipped with imaging or non-imaging infrared optical sensors for infrared remote sensing to obtain infrared images or infrared spectral information of sky, ground and ocean targets. Infrared radiation is the basic carrier of infrared remote sensing information, and the geometric and spectral resolution capabilities of infrared optical sensors on various platforms are directly related to their accurate measurement cap...

AI Technical Summary

Problems solved by technology

At present, the normal temperature black body has formed a stereotyped product and has been promoted and used abroad. There are also a few scientific research institutes in China. There are certain limitations in the application of chemical infrared remote sensing

[0005] For the increasingly high quantitative requirements of modern infrared remote sensing applications, some existing infrared blackbodies based on temperature measurement standards are relatively insufficient in terms of temperature control accuracy, effective emissivity, and standard uncertainty of brightness measurement.

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