Frame structure of small off-axis three-mirror ionospheric imager

Abstract

The invention relates to the technical field of space optical remote sensors, in particular to a frame structure of a small off-axis three-mirror ionospheric imager, and solves the problems of low rigidity and insufficient stray light suppression of the frame structure due to large length-width ratio of the structure caused by long focal length and wide field of view of an optical system. The frame structure mainly comprises a front cover plate, a rear cover plate, an off-axis three-mirror assembly, a main frame, a detector assembly, a T-shaped slit structure, a truss rod, a stray light elimination trap, a shading cylinder I, a shading cylinder II and a detector diaphragm. The off-axis three-mirror assembly comprises a primary mirror assembly, a secondary mirror assembly and a three-mirrorassembly. The main frame comprises a light inlet plate, a main mirror substrate, a secondary mirror substrate, a third mirror substrate, a detector substrate, a top plate, a bottom plate, a support plate I, a support plate II, a light barrier I, a light barrier II and a light barrier III. The frame structure is high in structural space utilization rate and high in specific stiffness, stray lightof an off-axis three-mirror system can be suppressed in a full-path mode, and the imaging quality of an optical system is effectively improved.

Description

technical field [0001] The invention relates to the technical field of space optical remote sensing, in particular to a frame structure of a small off-axis three-counter ionospheric imager, which has high space utilization, high specific stiffness, and can effectively suppress stray light in all optical paths. Background technique [0002] The earth's ionosphere is an important place for the operation of near-Earth satellites and space stations, and the safety of space vehicles can be effectively guaranteed by monitoring the characteristic parameters of the ionosphere. The ionospheric imager is a scientific instrument used to monitor the characteristic parameters of the ionosphere. It obtains the space environment parameters of the ionosphere by measuring the far ultraviolet radiation. [0003] The off-axis three-mirror optical system is widely used in the field of space optical remote sensing due to its advantages of large field of view and high resolution. Since the off-a...

AI Technical Summary

Problems solved by technology

The large envelope size of the truss rod type is not conducive to mass production, the design process of the main load-bearing cylinder is cumbersome, the optical adjustment of the mirror assembly is complicated, the traditional frame structure has low specific stiffness, and the space utilization rate is small

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