An integrating sphere and a large field of view negative angle uniform light source system based on the integrating sphere

Abstract

The present invention provides an integrating sphere and a large field of view negative angle uniform light source system based on the integrating sphere. For the sphere and the rear hemisphere, the light exit hole is sunken toward the back hemisphere, and the sunken light exit hole is still located in the front hemisphere. The number of light entrance holes is one or more and they are located on the wall of the front hemisphere. Light can be directly projected onto the hole wall of the light exit hole. The large-field-of-view negative-angle uniform light source system of the present invention utilizes the principle of an integrating sphere, combined with remote sensing camera radiation calibration technology, and for the first time breaks through the design of a super-large field-of-view negative-angle uniform illumination system, and its outgoing light simulation angle can be extended to 220°.

Description

technical field [0001] The invention relates to a uniform light source system with a large field of view, which can be used for radiation calibration of a camera with a large field of view, and can also be used for uniformity calibration of a CCD detector. Background technique [0002] Spacecraft and remote sensors need to be radiated before launch. The purpose is to calibrate the radiance received by the instrument under typical working conditions, provide working parameters for setting the camera, and establish the relationship between the input radiance at the entrance pupil of the camera and the digital output. quantitative relationship. In order to obtain images with appropriate exposure for ground targets with different radiances (changing with the sun's zenith angle and the average reflectance of ground objects), the exposure time of the detector and the gain of its amplifier must be selected reasonably. In order to obtain the best final image possible, careful radio...

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem of difficult radiometric calibration of ultra-wide-angle cameras (≥150°), combined with the principle of radiometric calibration of conventional cameras, the present invention proposes an integrating sphere for a uniform light device, and a large field of view negative-angle uniform light source based on the integrating sphere A system that can effectively perform radiometric calibration of ultra-wide-angle cameras in the laboratory

Images