中小型共光路系统支撑结构设计和分析  

Design and analysis of support structure of small and medium-sized common optical path system

作　　者：杨晓强[1] 陶忠[1] 刘莹奇 YANG Xiaoqiang;TAO Zhong;LIU Yingqi(Xi'an Institute of Applied Optics,Xi'an 710065,China)

机构地区：[1]西安应用光学研究所,陕西西安710065

出　　处：《应用光学》2023年第5期998-1009,共12页Journal of Applied Optics

摘　　要：主、次镜支撑技术是共光路光学系统的关键技术之一。针对在±60℃温度变化范围内工作的机载共光路光学系统,根据热膨胀系数匹配原则分别选择殷钢和ULE、钛合金和K9配对作为主、次镜及支撑结构的材料,并设计了高刚度无热化柔性支撑结构。最后,利用自研的光机联合仿真程序对主、次镜面型及整个光学系统的成像质量进行了光机一体化分析。分析结果表明:殷钢和ULE配对时,在±60℃均匀温差和10℃轴向、径向温度梯度下,主、次镜去除离焦后面型优于(1/100)λ,整个光学系统点列图RMS半径小于艾里斑半径,相面中心波前优于(1/50)λ,MTF@63 lp/mm优于0.45,无热化柔性支撑的一阶固有频率高达263 Hz;钛合金和K9配对时,60℃均匀温差下系统成像指标满足使用要求,10℃轴向、径向温度下成像质量无法满足使用要求。对装调完的殷钢和ULE配对光机系统进行了低温下分辨率测试,分辨率无明显变化,说明设计及分析可行。Primary and secondary mirror support technology is one of the key technologies of common optical path system.For the airborne optical system operating within the temperature change range of±60℃,the pairing of invar steel and ULE,titanium alloy and K9 were selected as the materials of primary and secondary mirrors as well as supporting structures according to the matching principle of thermal expansion coefficient,and the athermalization flexible support structure with high stiffness was designed.Finally,the imaging quality of the primary and secondary mirror types as well as the whole optical system was analyzed by using a selfdeveloped opto-mechanical co-simulation program.The results show that when invar steel and ULE are paired,under uniform temperature difference of±60℃and 10℃axial and radial temperature gradient,the surface shape is better than(1/100)λafter the primary and secondary mirror removing defocus,and the root-meansquare(RMS)radius of spot diagram of the whole optical system is smaller than Airy spot radius.The central wavefront of the phase surface is better than(1/50)λ,the MTF@63 lp/mm is better than 0.45,and the firstorder natural frequency with athermalization flexible support is up to 263 Hz.When titanium alloy and K9 are paired,the imaging index of the system under uniform temperature difference of 60℃meets the requirements,and the imaging quality at 10℃axial and radial temperature cannot meet the requirements.The resolution of invar steel and ULE paired opto-mechanical system was tested at low temperature,and there is no obvious change in resolution,which indicates that the design and analysis are feasible.

关 键 词：共光路 光机一体化分析 柔性支撑 温度梯度 

分 类 号：TN201[电子电信—物理电子学] TH703[机械工程—仪器科学与技术]