高精度静态星模拟器光学系统设计

Optical System Design of High-precision Static Star Simulator

为了实现对高精度星敏感器的地面测试,设计了一种高精度的静态星模拟器,要求星模拟器星间角距精度优于20″。采用激光直写技术刻划星点分划板,刻划精度优于1μm。结合系统的技术指标,通过ZEMAX软件设计了具有良好成像质量的准直光学系统。设计的准直光学系统有效通光口径为80mm,系统焦距为500mm,光谱范围为480~900nm,全视场9.2°内畸变小于0.02%,MTF接近衍射极限。提出用经纬仪对系统进行实际检测的方法,以及理论星间角距和实际星间角距的计算公式。

In order to realize the ground test of the high-precision star sensor,a high precision static star simulator was designed and required that the star angular distance of star simulator was better than 20 ″. The star reticle was made by laser direct technology,the score precision is better than 1μm. Combining the technical specifications of the system,the optical system with high imaging quality was designed by ZEMAX software. The design results of collimation optical system show that the entrance pupil diameter is 80 mm;the focus length is 500 mm;the wavelength range is 480~900 nm and distortion less than 0.02%;MTF reaches diffraction limit within the full field. A method to measure the system with theodolite was presented;and the calculation formula of the theoretical star angular distance and the actual star angular distance are conducted.