System and method for controlling membrane-base reflecting mirror surface shape

Abstract

The invention discloses a system and a method for controlling the membrane-base reflecting mirror surface shape. The system comprises a standard reflecting mirror surface shape designing module, an emulational analyzing module, a reflecting mirror surface shape monitoring module, a fuzzy logic controlling module, a reflecting mirror surface shape controlling actuator and a reflecting mirror surface shape feeding back module. The aperture and the F number of a membrane-base reflecting mirror needed for design are used as the parameters and the Zernike polynomial coefficient form is adopted to determine the standard reflecting mirror surface shape parameter; the real-time membrane-base reflecting mirror surface shape is detected; the errors of the arc rises for the central cross sections of both a membrane-base reflecting mirror and a standard reflecting mirror are used as control variables, and the control variables are processed by a fuzzy logic controller; the voltage needed for forming the membrane-base reflecting mirror is outputted; and the membrane-base reflecting mirror surface shape is changed with the electrostatic method. The invention adopts the emulational reflecting mirror surface shape control analysis based on the finite-element analysis method to predict the reflecting mirror surface shape control effect, optimize the fuzzy control rule base and reduce the difficulty of designing the fuzzy logic controller. The method provides the technological base for the effective membrane-base reflecting mirror surface shape.

Description

technical field [0001] The invention relates to a membrane-based reflector (membrane mirror) surface shape control system and a control method thereof, which are used to realize real-time control and correction of the membrane-based reflector's surface shape. Background technique [0002] With the continuous improvement of the requirements for the resolution, coverage and other indicators of the space optical system, it is urgent to develop a super-large aperture (10 meters, even 100 meters), ultra-light space telescope primary mirror. If the traditional optical manufacturing technology is adopted, with the increase of the primary mirror caliber, its processing difficulty and cost will increase sharply, and its volume and mass will be limited by the rocket's carrying capacity. Therefore, people have begun to seek other methods to replace traditional technology. Ultra-thin splicing technology, sparse aperture technology and film-based mirror technology are proposed based on ...

AI Technical Summary

Problems solved by technology

However, when this method is actually used in the process of surface shape control of film-based mirrors, there are two serious defects: one is that the establishment process of the surface shape influence function is very complicated and difficult, and it is difficult to obtain an accurate surface shape influence function; the other is The film-based reflector is an uncertain, nonlinear complex system, and it is very difficult to obtain its precise mathematical control model

Based on the above two reasons, it is difficult to achieve the design requirements and expected effects of the surface shape control of the film-based mirror by referring to the deformable mirror technology in adaptive optics.

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