Solar diffuse reflection plate device based on lens cover windowing and infrared radiation inversion method

The invention belongs to the technical field of equipment calibration inversion, and particularly relates to a sun diffuse reflection plate device based on lens cover windowing and an infrared radiation inversion method, and the sun diffuse reflection plate device and the infrared radiation inversion method are used for performing inversion on aerial target radiation measured by infrared radiation measurement equipment. The diffuse reflection plate device comprises a cylinder (12), a lens cover (1), a diffuse reflection plate (2), a rotating shaft (3) and a support (7), the cylinder (12) is sleeved on the outer edge of the front end of a telescope barrel, the lens cover (1) covers the aperture of the cylinder (12), the lens cover (1) is provided with a window (6), the diffuse reflection plate (2) is installed on a moving shaft of the rotating shaft (3), a fixed shaft of the rotating shaft (3) is installed on the support (7), and the support (7) is installed on the lens cover (1). Compared with a full-aperture