拼接望远镜中分块主镜曲率半径的误差分析

摘要

Based on geometry optical, the numerical simulation model of segmented telescope system with ray tracing is built, and the relation between curvature radius error of individual mirrors of segmented primary mirror and the image quality of segmented telescope system are analyzed. As monoliphic primary mirror, the error of curvature radius primary can be compensated by adjusting the focus of telescope system, but wavefront aberration induce by the random error of curvature radius of segmented primary mirror cannot be compensated and should zoom the wavefront aberration. When cophased the segmented primary mirror (wipe off the piston and tip-tilt induce by error of curvature radius of individual mirror), the image quality of segmented telescope system will be improved and the effect of error of curvature radius of individual mirror will be reduced.%本文根据几何光学原理，利用光线追迹方法建立的拼接望远镜光学系统的仿真模型，分析计算了拼接主镜中分块镜曲率半径误差对拼接望远镜光学系统的影响。当主镜为单镜面时候，其曲率半径误差引起的波像差可以通过调焦进行补偿；当主镜为分块镜拼接镜时，由于分块镜曲率半径误差的随机性，望远镜光学系统无法对波相差进行有效补偿，对分块镜的曲率半径要求很严格；当对拼接主镜进行共相后，相当于补偿掉单个分块镜中由曲率半径误差引起的平移和倾斜误差，望远镜像质有很大提高并降低了对分块镜曲率半径误差的要求。