Stability detection method for thermal control focusing mechanism

Abstract

The invention discloses a stability detection method for a thermal control focusing mechanism. A secondary mirror installed on a focusing ring serves as a first reflecting mirror, or a plane mirror instead of the secondary mirror is installed on the focusing ring to serve as the first reflecting mirror, and a standard mirror and an interferometer are sequentially arranged in the same optical axis in the incident light direction of the first reflecting mirror, so that parallel monochromatic light emitted by the interferometer is reflected by the standard mirror to form reference light, and after being reflected by the first reflecting mirror, the light is interfered with the reference light to form interference fringes; the interference fringes are minimized or disappear by adjusting the first reflecting mirror; and then heating and cooling are repeatedly carried out through temperature control equipment for multiple times, and the stability of the deformation of the focusing ring in the focusing process is determined by comparing the initial state, the interference fringe condition after each time of cooling and the interference fringe condition after each time of heating. According to the invention, the stability of the deformation of the focusing ring in the focusing process can be detected, effective focusing is ensured, and fatal influence on the imaging quality is avoided.

Description

technical field [0001] The invention relates to the field of a thermal control focusing mechanism of a space camera, in particular to a stability detection method of a thermal control focusing mechanism. Background technique [0002] Space-borne reflective, large focal length optical cameras usually cause the photosensitive chip to deviate from the clear imaging position due to severe vibration during launch, which is called defocus. In order to solve the problem of defocusing of the photosensitive chip after launching into orbit, a focusing mechanism will be added to the camera, and after launching into orbit, the photosensitive chip will return to the clear imaging position through focusing. The Chinese patent application with the application number 201710302694.8 discloses an active thermal control focusing device for a space camera, which uses a temperature control system to control the length of the focusing ring (the focusing ring is a ring-shaped metal structure). Mi...

AI Technical Summary

Problems solved by technology

Since the focus ring carries the secondary mirror that is crucial to the optical system, the deformation of the focus ring during the focusing process will affect the position and angle of the secondary mirror, which may affect the image quality

In order to ensure acceptable imaging quality, the deformation of the focus ring must be limited within a certain range, so it is necessary to test the stability of the mechanism of the focus ring, but there is no relevant detection method in the prior art

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