An on-board calibration device based on a variable temperature blackbody

Abstract

An on-board calibration device based on a variable temperature black body is used for on-board radiometric calibration of a space-borne infrared camera. The low-temperature blackbody is refrigerated by a semiconductor refrigerator, and the heat generated by the semiconductor refrigerator is dissipated through the radiation of the low-inertia, dynamic-balanced fan-shaped swing arm; the high-temperature blackbody is heated by an electric heater. The temperature of the high-temperature and low-temperature blackbody can be adjusted within a certain temperature range and can be set according to needs. When on-board radiation calibration of the infrared camera is required, the stepper motor cuts the high-temperature and low-temperature blackbodies into the optical path in turn through the fan-shaped swing arm, and moves them out after the calibration is completed. The on-board calibration device uses a low-temperature blackbody with semiconductor refrigeration, which expands the calibration temperature range. The temperature of the high-temperature and low-temperature blackbody is variable, so that the appropriate high-temperature and low-temperature blackbody temperature can be set according to the temperature range of the observed scene, thereby improving the calibration accuracy.

Description

Technical field [0001] The invention belongs to the technical field of satellite optical remote sensors, and relates to an on-board calibration device based on a variable temperature black body, which is used for on-board radiation calibration of a satellite-borne infrared camera. Background technique [0002] After the spaceborne infrared camera is launched into orbit, its performance will change due to factors such as the space environment and its own aging; in addition, the non-uniformity of the response of each detection element of the spaceborne infrared camera and changes over time will affect the imaging quality. If the on-orbit radiation calibration is not performed, it will affect the image application. There are many on-orbit calibration methods, including cross calibration, alternative calibration, and on-board calibration using the calibration device carried by the camera. Each calibration method has its advantages and limitations. For infrared cameras with larger ap...

AI Technical Summary

Problems solved by technology

Judging from similar loads at home and abroad, the current on-board calibration high and low temperature black bodies used in space-borne infrared cameras are usually set at a fixed temperature point, which limits the temperature range that can be calibrated, resulting in low radiation calibration accuracy, which is difficult to satisfy users. Increasingly stringent quantitative use requirements for remote sensing data

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