Integrating sphere and large-view-field negative-angle uniform light source system based on the integrating sphere

Abstract

The invention provides an integrating sphere and large-view-field negative-angle uniform light source system based on the integrating sphere. The integrating sphere comprises a cavity sphere, and one and more light inlets and a light outlet which are arranged on the cavity sphere, the cavity sphere comprises a front hemispheroid and a rear hemispheroid, the light outlet is recessed towards the rear hemispheroid, the recessed light outlet is still disposed in the front hemispheroid, the one and more light inlets are disposed on the spherical wall of the front hemispheroid, and light coming into the light inlets can be directly projected to the hole wall of the light outlet. The large-view-field negative-angle uniform light source system provided by the invention, by use of an integrating sphere principle, through combination with a remote sensing camera radiation scaling technology, designs a super-large-view-field negative-angle uniform illumination system in a ground-breaking mode for the first time ever, and the emitting light simulation angle can be expanded to 220 DEG C.

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...

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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

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