2m级薄反射镜支撑结构的设计  

Design of 2 m Thin Mirror Support Mechanism

作　　者：褚奇 胡明勇[2] 刘天 袁梦雨 封志伟 CHU Qi;HU Ming-yong;LIU Tian;YUAN Meng-yu;FENGZhi-Wei(School of Instrument Science and Photoelectric Engineering,Hefei University of Technology,Hefei 230009,China;Academy of Opto-Electric Technology,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学仪器科学与光电工程学院,安徽合肥230009 [2]合肥工业大学光电技术研究院,安徽合肥230009

出　　处：《光学与光电技术》2024年第6期114-121,共8页Optics & Optoelectronic Technology

摘　　要：针对2 m级微晶玻璃反射镜厚度高、成本高、支撑难度大的问题,使用ANSYS有限元分析软件对参数化的反射镜模型进行静力学分析,对Whiffletree 18点支撑、27点支撑和36点支撑的支撑点位置和层数进行了对比,对反射镜光轴偏转角度与面型变化的关系进行了分析。根据静力学分析结果,2 m级反射镜的偏转角度不宜超过10°,支撑方式采用轴向36点Whiffletree被动支撑、侧向12点切向杆A-Frame支撑的组合支撑。使用该支撑方案,在保证面型RMS≤λ/50(λ=632.8 nm)的前提下,反射镜厚度从理论厚度285 mm降至125mm,极大降低了反射镜的生产成本,减小了系统重量,说明该支撑结构具有良好的工程应用能力。Aiming at the problems of high thickness,high cost and difficult support of 2 m grade glass-ceramics mirror,ANSYS finite element analysis software is used to carry out static analysis on the parametric mirror model,and the position and number of support points and layers of Whiffletree 18-point support,27-point support and 36-point support are compared.The relation between the deflection angle of the optical axis and the variation of the surface profile of the mirror is analyzed.According to the results of static analysis,the deflection angle of the 2 m class mirror should not exceed 10o.The support scheme adopts the combination of axial 36-point Whiffletree passive support and lateral 12-point tangential rod A-Frame support.Using this support scheme,the theoretical thickness of the mirror is reduced from 285 mm to 125 mm under the premise that the RMS of the surface type is≤a/50(α=632.8 nm),which greatly reduces the production cost of the mirror and the system weight,indicating that the support structure has good engineering application ability.

关 键 词：2 m级反射镜 36点Whiffletree支撑 A-Frame支撑 参数化建模 静力学分析 

分 类 号：TH751[机械工程—仪器科学与技术]