摘要
为满足地基大口径主焦点式望远镜的多谱段观测需求,对比研究了滤光片切换机构的结构形式。针对传统形式滤光轮机构的缺点,设计了一种沿光轴圆周均布式的新型滤光轮机构,以实现将不同透过谱段的滤光片依次在光路中切入和切出。该滤光轮机构由驱动组件和滤光片组件组成,与传统形式滤光轮机构相比,该机构安装时无需与光轴偏置,充分利用了光轴圆周空间,能够减小对主镜的遮拦。首先,介绍了滤光轮机构的组成及工作原理,并对关键部件进行了选型计算。随后,对滤光轮机构进行了模态分析,其一阶固有频率为108 Hz。最后,对滤光轮机构进行了切换精度测量、滤光片面形精度检测以及高低温试验。检测和试验结果表明,该滤光轮机构的滤光片切入后偏心误差最大为0.1 mm,滤光片面形精度均方根(Root Mean Square,RMS)值均优于λ/30,在系统的工作温度范围内切换顺畅无卡滞。该滤光轮机构能够满足大口径主焦点式望远镜的多谱段观测要求,为滤光轮设计提供了新思路。
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 mecha⁃nism arranged along the optical axis was developed,permitting 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 for optical-axis offset during installation,makes full use of the circumferential space around the optical axis,and reduces prima⁃ry-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 108 Hz.The mechanism was further evaluated through switching-accuracy measurements,surface-fig⁃ure accuracy tests of the filters,and high-low temperature environmental testing.Results show a maxi⁃mum filter eccentricity error of 0.1 mm after insertion,root-mean-square surface-figure errors for all filters better thanλ/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 re⁃quirements of large-aperture prime-focus telescopes and offers a novel approach to filter-wheel design.
作者
姜海波
赵金宇
郭鹏
贺昌龙
邵亮
姜晰文
JIANG Haibo;ZHAO Jinyu;GUO Peng;HE Changlong;SHAO Liang;JIANG Xiwen(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《光学精密工程》
北大核心
2025年第21期3343-3351,共9页
Optics and Precision Engineering
基金
吉林省自然科学基金资助项目(No.20240101309JC)。
关键词
滤光轮机构
主焦点
圆周均布
滤光片
高低温试验
filter wheel mechanism
prime focus
circumferentially distributed
filter
high-low temperature environmental test
