Large relative aperture and high precision catadioptric star sensor optical system

Abstract

The optical system of large relative aperture and high-precision catadioptric star sensor belongs to the field of optical system technology. In order to overcome the problems existing in the prior art, the optical system sets the front group with positive focal power and the focal power of The positive rear group, the front mirror group is composed of a secondary reflector and a primary reflector; the rear mirror group is composed of a first convex-concave lens, a second convex-concave lens, a third convex-concave lens and parallel flat glass, and the first The convex-concave lens, the second convex-concave lens and the third convex-concave lens are all spherical lenses; the air interval between the secondary reflector and the first convex-concave lens is 68.034, and the air interval between the secondary reflector and the main reflector is 72mm, the air gap between the first convex-concave lens and the second convex-concave lens is 0.5mm, the air gap between the second convex-concave lens and the third convex-concave lens is 2.013mm, and the air gap between the third convex-concave lens and the parallel flat glass The interval is 7.328mm.

Description

technical field [0001] The invention relates to a catadioptric star sensor optical system, which belongs to the technical field of optical systems. Background technique [0002] Star sensors have a variety of imaging models according to the wavelength range and detector type used. Their performance indicators are quite different. Most of them adopt the transmission type of full transmission lens. The focal length of the system is generally 20mm-60mm, and the effective entrance pupil diameter is generally 10mm-50mm. The incident light energy received by the image detector per unit time is less, and the motion imaging Attitude-time integration time is long, the image refresh rate is slow; the adaptive spectral range is narrow; imaging distortion is large, and the authenticity is poor. Contents of the invention [0003] In order to solve the problems in the prior art that the incident light energy received by the image detector per unit time is small, the integration time is...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems in the prior art that the incident light energy received by the image detector per unit time is small, the integration time is long when the motion imaging is fixed, and the image refresh rate is slow; the adaptive spectral range is narrow; the imaging distortion is large and the authenticity is poor. Provide a high-precision catadioptric star sensor optical system with large relative aperture, large entrance pupil area, small deviation of the energy center of mass of the entire field of view, and low distortion. Reduce the integration time of the image detector of the star sensor, meet the requirements of fast attitude determination of the star sensor, expand the application range of the optical system of the star sensor, and overcome the defect of the low performance index of the existing technology of the transmissive star sensor

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