卡塞格林系统结构设计与仿真  

Cassegrain System Structural Design and Simulation

作　　者：王健[1] 张美君[1] 虞林瑶[1] 张宇鹏[1] 李永刚[1] Wang Jian;Zhang Meijun;Yu Linyao;Zhang Yupeng;Li Yonggang(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130000,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130000

出　　处：《机电工程技术》2022年第5期84-86,97,共4页Mechanical & Electrical Engineering Technology

摘　　要：卡塞格林系统常用于航空航天和军事装备的光电设备中。在卡塞格林系统中,主镜面形决定了整个光学系统成像质量。随着光电行业的发展,要求光学系统质量小,性能高,而系统的质量与刚度相互矛盾,既要降低系统质量,又要保证系统抵抗温度变化导致的面形变化。主镜系统优化前的质量是3.6 kg,反射面RMS是1/33λ。使用光机热集成仿真分析的方法,分析主镜系统对温度的敏感程度。每升高(或下降)5℃,主镜反射面RMS值变化2.5 nm。根据分析结果优化主镜结构和主镜支撑结构,由三点支撑结构改为中心支撑结构,优化后的系统质量是3.1 kg,反射面RMS是1/35λ。分析优化后的主镜系统对温度的敏感度,每升高(或下降)5℃,主镜反射面RMS值变化3.9 nm,这种微小变化对成像质量无影响。实现降低系统质量和保证成像质量的目标。Cassegrain system is often used in photoelectric equipment of aerospace and military equipment.In Cassegrain system,the shape of the main mirror determines the imaging quality of the whole optical system.With the development of photoelectric industry,the optical system is required to have small quality and high performance,and the quality and stiffness of the system are contradictory.It is necessary to reduce the system quality and ensure that the system can resist the surface shape change caused by temperature change.The mass of the primary mirror system before optimization was 3.6 kg and the RMS of the reflecting surface was 1/33λ.The sensitivity of the primary mirror system to temperature was analyzed by using the method of optical mechanical thermal integration simulation analysis.The RMS value of the reflecting surface of the main mirror changeed by 2.5 nm every 5℃increase(or decrease).According to the analysis results,the main mirror structure and the main mirror support structure were optimized,and the three-point support structure was changed to the central support structure.The optimized system mass was 3.1kg and the reflecting surface RMS was 1/35λ.The sensitivity of the optimized primary mirror system to temperature was analyzed.The RMS value of the primary mirror reflector changes by 3.9 nm every 5℃rise(or fall),which had no impact on the imaging quality.The design achieves the goal of reducing system quality and ensuring imaging quality.

关 键 词：卡塞格林系统 光机热集成仿真 光机结构设计 面形拟合 

分 类 号：TH122[机械工程—机械设计及理论]