Space optical remote sensor secondary mirror focusing flexible motion mechanism

Abstract

The invention relates to a space optical remote sensor secondary mirror focusing flexible motion mechanism, belonging to the technical field of space optical remote sensing. The focusing flexible motion mechanism includes a housing, a top cover covering the housing, a secondary mirror flexible support assembly, a flexible drive mechanism assembly and a flexible guide mechanism assembly disposed within the housing, and a motor-screw assembly disposed outside the housing. The focusing flexible motion mechanism can guarantee that the optical focusing of the secondary mirror can be realized in an empty-return-free, stuck-free, and accurate manner when the mechanism works in a low-temperature environment under the premise that the high stiffness, high strength, high stability, high surface shape precision support of the secondary mirror of a space optical remote sensor are realized, and the position precision requirements of eccentricity and inclination of the secondary mirror relative to the main mirror proposed by the optical design can be met, the processing technology and assembling process are simple, the work is reliable, and the maintenance is not need.

Description

technical field [0001] The invention belongs to the technical field of space optical remote sensing, and specifically relates to a flexible movement mechanism for focusing of a secondary mirror of a space optical remote sensor, which is especially suitable for low-temperature working environments. Background technique [0002] The space optical remote sensor is a precise optical remote sensing system for space astronomical observation, space-based earth resource survey, geographic information mapping and national defense detailed survey and census. The long-wave infrared space telescope is a space optical remote sensor working in the long-wave infrared spectrum. In order to reduce its own infrared background noise radiation and improve the signal-to-noise ratio of imaging, it needs to cool the whole machine to below 5K with liquid helium during astronomical observation. low temperature. The remote sensor is completed in the ground room temperature environment (20°C, ie unde...

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Problems solved by technology

The disadvantages of this installation technology are: a). The secondary mirror adjustment mechanism adopts a peripheral pressing installation method for the secondary mirror, and installation stress will be generated on the surface of the secondary mirror to cause deformation of the mirror surface, and it is not suitable for environments with large temperature fluctuations; b).Three ball screws are used to guide and drive the linear motion of the secondary mirror. It is designed for over-constraint, which is very difficult to process and assemble, and it is very easy to cause jamming and deformation of the secondary mirror; c).Transmission The method is gear transmission and screw transmission, the mechanism design is complex, and the requirements for processing and assembly precision are very high. It is necessary to solve the common problems of various space mechanisms such as mechanism backlash, vacuum lubrication and sealing, and stagnation when temperature changes.

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