Reflective star sensor light shield

Abstract

A reflective star sensor light shield comprises three thin-wall cone barrels, wherein the three thin-wall cone barrels are successively connected. Inner walls of two cone barrels which are far from a lens are smooth clean surfaces and are sprayed with black paint or black films with high reflectivity and a low scattering rate. The inner wall of the cone barrel which is close to the lens is a baffle vane or a barrel type structure of eliminating veiling glare threads and is sprayed with black paint or black films with low reflectivity and the low scattering rate. The whole light shield can possess a optimal length through setting an algebraic relation of cone angles of each cone barrel. The reflective star sensor light shield of the invention has a short length and light weight, and is convenient for processing and manufacturing. The reflective star sensor light shield possesses strong inhibition capability for stray light, such as sunlight and ground gas light, which is a strong light source out of field of view. The invention can be used for the star sensor to shade light and be used for optical remote sensors to explore deep space, such as a star camera and the like.

Description

technical field [0001] The invention belongs to the technical field of spacecraft optics, in particular to a reflective shading cover for a star sensor. Background technique [0002] The star sensor hood is mainly to suppress stray light such as sunlight, earth atmosphere light and moon light outside the field of view. Compared with the brightness of the imaging target star, the brightness of these stray light sources is several orders of magnitude or even tens of orders of magnitude stronger, so the star sensor must have excellent suppression ability, so that the strong stray light outside the field of view on the image plane After many times of attenuation, it falls below the brightness of the imaging target. [0003] The existing star sensor shading cover, such as the patent "CN 1502524 A star sensor shading cover and its design method", adopts a two-stage shading cover, and the extinction part of both poles adopts a conical surface structure. At the same time, the seco...

AI Technical Summary

Problems solved by technology

[0003] The existing star sensor shading cover, such as the patent "CN 1502524 A star sensor shading cover and its design method", adopts a two-stage shading cover, and the extinction part of both poles adopts a conical surface structure. At the same time, the secondary absorption cone black paint spraying is limited by the existing technical level, so that the effect of suppressing strong stray light outside the field of view is greatly reduced, and the ideal effect cannot be achieved.

The light hoods reported in other public documents all adopt a two-stage light hood with a cylindrical light-blocking ring structure, which has a large volume and weight, and it is difficult to machine and spray black paint, and the ability to suppress strong stray light outside the field of view is relatively poor. Difficult to guarantee

[0004] The existing straight barrel-type hoods cannot meet the requirements of such a high suppression ability; for example, patents CN201255802, CN201322836, etc., cannot meet the suppression requirements of strong light sources outside the field of view, and the volume and weight are relatively large

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