摘要
针对某400 mm口径捕获与跟踪望远镜,提出了一种结构设计方案。在该方案中,对主镜支撑采用三点柔性底支撑加球头芯轴侧支撑的结构,避免支撑应力干涉,保证主镜具有高面形精度;在主、次镜连接环节中使用铟钢连杆结构,确保大温差下主、次镜间距的变化在公差范围内,保证望远镜在极限条件下具有良好像质。进而建立望远镜整体结构的有限元模型,分析了主镜面形精度及镜筒结构强度,得出主镜面形均方根(RMS)值优于λ/40,主、次镜相对偏心及倾斜分别为3μm、2.5″,满足指标要求。使用激光干涉仪及平行光管对望远镜光学指标进行了定量检测,发现光学系统RMS值优于λ/14,星点半峰全宽(FWHM)值为1.432,接近衍射极限水平。所设计方案对同类望远镜的结构设计具有一定参考价值。
A structural design scheme is proposed for a 400 mm aperture capture and tracking telescope.In this scheme,the main mirror is supported by three-point flexible bottom support and ball head spindle side support to avoid the interference of support stress and ensure that the main mirror has high profile accuracy.And an indium steel connecting rod structure is used in the connection of primary mirror and secondary mirror to ensure that the distance between primary and secondary mirrors changes within the tolerance range under large temperature diference,so that the telescope has good image quality under the limit conditions.Furthermore,the finite element model of the whole structure of the telescope is established,and the shape accuracy of the main mirror and the structural strength of the barrel are analyzed.The root mean square(RMS) value of the main mirror shape is better than λ/40,and the relative eccentricity and inclination of primary mirror and secondary mirror are 3μm and 2.5″respectively,which meets the index requirements.Finally,the optical parameters of the telescope are measured quantitatively by using laser interferometer and collimator,and it is found that the RMS value of optical system is better than λ/14,the full width at half maxima(FWHM) value of star point is 1.432,which is close to the diffraction limit level.The designed scheme has certain reference value for the structure design of similar telescopes.
作者
张岩
李桐
陈宝刚
范文强
王亮
ZHANG Yan;LI Tong;CHEN Baogang;FAN Wenqiang;WANG Liang(Departmentof Photoelectric Detection,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;China National Complete Engineering Corporation,Beijing 100044,China)
出处
《量子电子学报》
CAS
CSCD
北大核心
2020年第3期294-301,共8页
Chinese Journal of Quantum Electronics
基金
吉林省科技发展计划优秀青年人才基金(20180520076JH)。
关键词
应用光学
光机结构
主镜支撑
衍射极限
面形精度
applied optics
optical mechanical structure
main mirror support
diffraction limit
surface accuracy
作者简介
张岩(1988-),吉林长春人,助理研究员,硕士,主要从事地基望远镜光机结构的研究工作。Email:zhangfirstyan@126.com。
