MAIN OPTICAL SYSTEM OF CHINA'S 2.16-m TELESCOPE

This paper introduces configuration of the main optical system of China’s 2.16-m telescope and the results of its optical design. There are three foci in this telescope: the Cassegrain, the coude and the prime foci. Ritchey-Chretien (R-C) system is used as the Cassegrain system. The 2-lens and 3-lens correctors are prepared for the Cassegrain and the prime foci respectively. The most significant characteristic of this optical system is that the coude and Cassegrain systems share one secondary mirror. A relay mirror is added to the coude system. When the two systems exchange, the secondary mirror moves slightly, and the coude system obtained is free from both spherical aberration and coma simultaneously. Some other coude configurations and a special configuration for setting the focal reducer are also introduced in this paper.

中国2.16m望远镜的主光路系统

本文介绍中国2.16m望远镜主光路系统的方案和设计结果。这架望远镜有Cassegrain、折轴和主焦点三个工作焦点,Cassegrain系统采用的是R-C系统,焦点和主焦点分別配有由两片透镜和三片透镜组成的改正器。光学系统最大的特点是折轴系统和Cassegrain系统共用同一个付镜,折轴系统中加有一个中继镜,转换时副镜作小量移动,所得的折轴系统是同时消球差和消彗差的。本文也介绍了我们提出的一些其它折轴方案和一个缩焦器安置方案。