Long-focal-length athermalization star sensor optical system

Abstract

The invention discloses a long-focal-length athermalization star sensor optical system, which comprises an aperture diaphragm, a front lens group, a middle lens group, a rear lens group and an image plane, wherein the front lens group comprises a first lens; the aperture diaphragm is located on the front surface of the first lens; the middle lens group comprises a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; the rear lens group comprises a seventh lens and an eighth lens; the first lens, the third lens, the sixth lens and the eighth lens are all made of dense flintglass; the second lens, the fourth lens and the fifth lens are all made of heavy crown glass; and the seventh lens is made of crown glass. The long-focal-length athermalization star sensor optical system adopts a conventional glass material to realize an aberration balance and design under different temperatures, solves the problem of reduction of thermal blooming image quality caused by the factthat the temperature of the long-focal-length optical system is easy to change, is high in imaging quality, meets use requirements of the space ambient temperature, and lowers the requirement for temperature control of the star sensor optical system.

Description

technical field [0001] The invention relates to an optical system of a star sensor, in particular to an optical system of an athermalized star sensor with a long focal length. Background technique [0002] In the known inertial navigation equipment, the star sensor is one of the measuring instruments with the highest measurement accuracy, and the measurement accuracy can reach sub-second level. Since the star sensor uses an optical system to detect the star light signal with a stable position and spectrum distribution in space, the measurement accuracy does not drift with time, and it provides a stable three-axis attitude angle information output for the long-term high-precision flight of the spacecraft. [0003] As the core device of the star sensor, the optical system of the star sensor is a key component for the star sensor to achieve high signal-to-noise ratio star spectral energy collection and high-precision star barycenter position detection. The object detected by t...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the degradation of imaging quality caused by the large-scale temperature change of the long focal length optical system in the space application environment

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