Calibration switching mechanism for reducing background radiation influences in blackbody radiation calibration process

The invention provides a calibration switching mechanism for reducing background radiation influences in blackbody radiation calibration process. The calibration switching mechanism comprises a variable temperature blackbody assembly, a rotary table, self-reflection angle mirrors and a driving mechanism. The variable temperature blackbody assembly is arranged on the rotary table in a heat insulated mode, and the self-reflection angle mirrors are arranged on the other areas of the rotary table except the area where the variable temperature blackbody assembly is arranged. The driving mechanism is connected with the rotary table and is used for driving the rotary table to be in three positions of imaging, blackbody calibration and detector focal plane self-reflection calibration, and each position occupies one third of the rotary table. Blackbodies in the variable temperature blackbody assembly are non-point source blackbodies of high emissivity, and temperature points of multiple blackbodies are set by adjusting semiconductor coolers on back portions of the blackbodies. By means of the calibration switching mechanism, the background radiation of a space optical remote sensor in the blackbody radiation calibration process is greatly reduced, the background radiation of 60K is far less than the dynamic response range of an infrared detector, the background radiation cannot be mixed in calibration data, and accuracy of the calibration data is greatly improved.