A light shield system with high stray light suppression ratio and its design method

Abstract

The invention provides a shading system with a high stray light suppression ratio and a design method thereof, belonging to the field of stray light suppression of optical-mechanical systems. Calculate the length L of the hood according to the sun avoidance angle θ, the half-field angle ω of the optical system, and the diameter of the entrance pupil d provided by the system index requirements. At the same time, in order to effectively suppress the influence of the atmosphere and light, a light baffle is set at the front end of the hood , the light barrier is retracted when launching, and the light barrier is opened after entering the predetermined track. The entire lens hood system includes the first block light ring, the second block light ring, the third block light ring, the fourth block light ring, the fifth block light ring, the sixth block light ring, the light hood shell and the light block, to ensure that the star sensor is at 25 degrees The solar avoidance angle and the 30-degree earth-air-optical avoidance angle can output effective data. The sunshade design method and system have the advantages of easy processing, easy installation and adjustment, avoidance of solar stray light and earth atmosphere stray light, high stray light suppression ratio, and the like.

Description

technical field [0001] The invention relates to the field of stray light suppression of camera systems, in particular to a shading system with a high stray light suppression ratio and a design method thereof, which is a shading cover for satellite star sensors with strict requirements on solar stray light and earth atmosphere stray light and its implementation method. Background technique [0002] Stray light, also known as stray light or stray radiation, refers to the non-imaging light that reaches the detector through the non-imaging optical path in the optical system. Due to the existence of stray light, the imaging contrast and signal-to-noise ratio of the optical system will decrease, and in severe cases, the detection system will fail. [0003] The star sensor achieves the purpose of measuring the attitude of the spacecraft by imaging the stars on the celestial sphere and calculating the transformation matrix of the stars in the camera coordinate system and the earth-...

AI Technical Summary

Problems solved by technology

The imaging object of the star sensor is a star, and the signal strength is weak. In practical applications, it is easily affected by strong light sources such as direct sunlight from the sun, or reflected light from the moon and the earth. In severe cases, the performance of the star sensor will decline or even fail to work.

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