A Flexible Motion Mechanism for Focusing Secondary Mirror of Space Optical Remote Sensor

Abstract

The invention relates to a space optical remote sensor secondary mirror focusing flexible movement mechanism, which belongs to the technical field of space optical remote sensing. The focusing flexible movement mechanism of the present invention includes: a casing, a top cover covered on the casing, a secondary mirror flexible support assembly, a flexible driving mechanism assembly and a flexible guiding mechanism assembly arranged inside the casing, and a motor arranged outside the casing— - lead screw assembly. The focusing flexible movement mechanism, on the premise of achieving high rigidity, high strength, high stability, and high surface precision support for the secondary mirror of the space optical remote sensor, ensures that it can work in a low temperature environment without backlash and without The optical focusing of the secondary mirror is realized precisely and accurately, and the position accuracy requirements of the secondary mirror relative to the primary mirror such as eccentricity and inclination are met by the optical design. The processing technology and assembly process are simple, the work is reliable, and the maintenance process is exempted.

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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