长焦距大视场光学系统的光机结构设计  

Optical and mechanical design for long focal length and wide-field optical system

作　　者：李志来[1] 薛栋林[1] 张学军[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《光学精密工程》2008年第12期2485-2490,共6页Optics and Precision Engineering

基　　金：国家杰出青年基金资助项目(No.69925512)

摘　　要：为了实现某长焦距大视场轻型离轴三反空间相机的光机结构设计,基于SiC材料空间反射镜,采用适合于轻型高分辨空间相机的桁架结构,对离轴TMA系统的支撑结构进行了静力学、动力学建模,优化了结构形式。采用光机热集成分析方法,指导、评价和优化相机光机结构设计过程,提高结构固有频率,增强相机热稳定性适应范围。相机结构设计基频>93Hz,在±4℃均匀温变工况和重力作用下,相机光学系统传递函数(MTF)达到0.37;反射镜组件加速度响应最大放大倍数<6倍。结果表明,采用该方法设计的相机结构固有频率高,重力变形、抗振性能、热变形等方面均能满足使用要求。In order to design a long focal length and wide-field off-axial three-mirror system with high quality in space telescope, the major issues of the optical and mechanical system were discussed based on SiC mirror material. To design a lightweight and precision truss to fit to characteristic of the lighting and high resolution space camera, the mode analysis method and the designing principles for main truss were studied. A dynamic model to the systematic supporting structure based on TMA was established systematically, then its supporting structure was analyzed by means of thermal-structuraloptical integrated analysis method. Experiments show that the fundamental frequency of the structure is greater than 93 Hz. Under influence of deadweight and uniform temperature change of ±4 ℃, the MTF of the camera reachs to 0.37 and the acceleration response under sinusoidal vibration of mirror module is less than 6. The results indicate that proposed design method can meet the requirements for deadweight deflection, fundamental frequency, anti-vibration, thermal stability of the long focal length and wide-field off-axial optical system.

关 键 词：光学遥感器 长焦距 大视场 离轴三反光学系统 支撑结构 桁架 

分 类 号：TH703[机械工程—仪器科学与技术] V243[机械工程—精密仪器及机械]