星敏感器光学系统的研制与性能测试

Development and Performance Testing of Optical System for Star Sensor

针对星敏感器系统探测要求,设计了像方远心光路的双高斯光学系统。该系统在满足弥散斑和能量集中度等要求的情况下,具有相对孔径大、畸变小、色差小以及星点位置对离焦不敏感等特点。利用调制传递函数仪测量了星敏感器光学系统的光学性能,测量结果表明各视场处的弥散斑80%的能量均集中在直径为20μm的圆内。提出了采用一维精密气浮转台和单星模拟器对光学系统进行质心畸变测量的方法,测试结果显示星点光斑的质心畸变小于9″。

According to detection requirements of the star sensor system, a double Gauss optical system with image side telecentricity is designed. This optical system, not only satisfies the special requirements of disperged spot and energy centralized distribution, but also possesses large aperture, low distortion, small color deviation, and insensitivity to defocus. The optical performance of the star sensor is quantitatively measured by nodulation trafisfor function （MTF） analyzer. 80 % energy of dispersion spot for each field of view is concentrated in a circle with 20 ~fn diameter. Meanwhile, a method using one-dimensional precision rotating platform and single star simulator to test tl^e centroid distortion of optical system is proposed. The test results show that centroid distortion of the star point is better than 9 arc second.