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利用薄膜反射镜作为太空望远镜主镜是研究大口径、超轻型未来空间光学系统的最新方向之一。基于静电学原理,设计了口径Ф200mm薄膜反射镜静电成形实验系统,该系统包括薄膜反射镜固定装置、电极板装置以及直流高压系统。采用ZYGO干涉仪和莫尔偏折术,分别对薄膜反射镜面形随直流电压的变化情况以及不同电压下薄膜反射镜的顶点曲率半径进行了观察和测量,并与理论值进行了比较和分析。实验结果表明,该系统可有效改变薄膜反射镜的面形。目前,在700V电压下,薄膜反射镜的顶点曲率半径达17.7m。
Using thin-film mirrors as the primary mirror of space telescopes is one of the newest directions in the research of large-aperture, ultra-light future space optical systems. Based on the principle of electrostatics, an experimental system of Ф200mm aperture mirror electrostatics was designed. The system includes thin-film mirror fixture, electrode plate device and DC high voltage system. ZYGO interferometer and Moire deflexion were used to observe and measure the change of the surface shape of the film mirror with the DC voltage and the peak curvature radius of the film mirror under different voltages. The comparison and analysis were made with the theoretical values. The experimental results show that the system can effectively change the surface shape of the thin film reflector. At present, at the voltage of 700V, the radius of curvature of the apex of the film mirror reaches 17.7m.