大口径主焦点望远镜的滤光轮机构设计与试验

打开文本图片集

关键词：滤光轮机构；主焦点；圆周均布；滤光片；高低温试验中图分类号：TH751 文献标识码：Adoi：10.37188/OPE.20253321.3343 CSTR：32169.14.OPE.20253321.3343

Abstract： To satisfy the multi-band observation requirements of ground-based large-aperture prime-focus telescopes，the structural configurations of filter-switching mechanisms were compared and analyzed. To overcome limitations of conventional filter wheels，a novel circumferentially distributed filter-wheel mechanism arranged along the optical axis was developed，permiting sequential insertion and retraction of filters with different transmission bands into the optical path. The mechanism comprises a drive assembly and a filter assembly.Relative to traditional designs，this configuration obviates the need foroptical-axis offset during installation，makes fulluse of the circumferential space around the optical axis，and reduces primary-mirror obscuration. The composition and operating principle of the mechanism are described，followed by component-selection calculations for critical parts. Modal analysis yields a first-order natural frequency of 108Hz . The mechanism was further evaluated through switching-accuracy measurements，surface-figure accuracy tests of the filters，and high-low temperature environmental testing.Results show a maximum filter eccentricity error of 0.1mm after insertion，root-mean-square surface-figure errors for all filters better than λ/30 ，and smooth， jam-free operation across the system's operational temperature range. These results demonstrate that the proposed filter-wheel mechanism meets the multi-band observation requirements of large-aperture prime-focus telescopes and offers a novel approach to filter-wheel design.

Key Words： filter wheel mechanism；prime focus；circumferentially distributed;filter；high-low temperature environmental test

1引言

随着深空探测领域的快速发展，对地基探测设备的性能要求越来越高，望远镜的通光口径也不断增大。（剩余10690字）