Correction Method of Radiometric Calibration Data of Long Wave Infrared Camera

Abstract

The present invention provides a long-wave infrared camera radiation calibration data correction method, comprising: the long-wave infrared camera images different temperatures of a temperature-variable black body to obtain radiation calibration data data1; through stray light analysis, obtains the internal stray radiation of the long-wave infrared camera The main source: the long-wave infrared camera images a fixed temperature of the temperature-variable black body, and obtains the imaging data data2; changes the temperature of the stray radiation source inside the long-wave infrared camera, respectively obtains the imaging data data3; processes the imaging data data2, and obtains the detection data of the long-wave infrared camera Correction relationship between focal plane temperature change and imaging data data2 △DN d ; Process the imaging data data3 to obtain the equivalent body temperature of the long-wave infrared camera and the correction relationship △DN to the imaging data data3 s ; Using the correction relation △DN d 、△DN s , correct the radiation calibration data data1. The invention improves the linearity of the radiation response of the long-wave infrared camera, greatly improves the ability to identify targets at different temperatures, and lays a foundation for accurate quantitative inversion work.

Description

technical field [0001] The invention relates to the field of radiation calibration, in particular to a correction method for radiation calibration data of a long-wave infrared camera. Background technique [0002] Mercury cadmium telluride (HgCdTe) ternary compound is the most ideal infrared detection material and has an irreplaceable status. Due to the extremely narrow band gap of the long-wave HgCdTe material, trace dislocations, defects, impurities, and thermal stress in the material will have a decisive impact on the performance of the detector, resulting in increased dark current and noise on the detector chip. It even causes device failure. Therefore, the radiation stray light inside the camera body or the fluctuation of the detector focal plane temperature has a great influence on the detector output signal. In order to obtain a real and effective image output, not only higher requirements are put forward for the preparation process of the mercury cadmium telluride d...

AI Technical Summary

Problems solved by technology

Due to the extremely narrow band gap of the long-wave HgCdTe material, trace dislocations, defects, impurities, and thermal stress in the material will have a decisive impact on the performance of the detector, resulting in increased dark current and noise on the detector chip. Even cause the device to fail, therefore, the radiation stray light inside the camera body or the fluctuation of the detector focal plane temperature has a great influence on the detector output signal

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