“宋”望远镜夏克哈特曼光学系统设计

 根据中国“宋”标准节点望远镜系统要求,设计了用于望远镜波前误差测量的夏克哈特曼（S-H）传感器光学系统。从望远镜衍射极限成像和观测星等要求出发,对S-H的采样点数选取和波面重建精度进行分析计算,根据所选微透镜阵列和“宋”望远镜光学参数进行S-H准直镜的消像差设计,采用两组双胶合透镜实现了480 nm~680 nm波长范围的系统衍射极限成像。设计的系统能够实现6等星的目标测量,测量精度0.05"。根据设计结果搭建了实验系统,对主镜初始状态和校正之后的波前误差进行了测量,并将S-H测量结果与4D干涉仪测量结果进行了比较。实验结果表明：所设计S-H系统测量精度0.008 μm（RMS）,能够满足“宋”望远镜的技术要求。

Design of SONG Shack-Hartmann optical system

In this paper, we gave an optic design of stellar oscillations network group (SONG) Shack-Hartmann (S-H). The optical system and main parameters of S-H were determined, mainly according to the demands of diffraction limited imaging quality and magnitude of the telescope; According to the optical parameters of SONG and the micro lens array, an eliminating aberration design was carried out based on two doublets; The performance of the S-H was within diffraction limit. Designing results showed that the 6th magnitude and accuracy of 0.05″ could be achieved. Based on the design results, an experimental system was built. A comparative study on measuring accuracy between S-H and 4-D interferometer was carried out. The experimental results showed that the measuring accuracy of S-H is 0.008 μm which could meet the requirements of Chinese SONG telescope.