光电对抗平台变焦镜头被动消热差结构设计与光机热集成分析  

Analysis of Passive Athermalization Structure Design and Integrated Opto-Mechanical-Thermal of Zoom Lens of Photoelectric Countermeasure Platform

作　　者：杜伟峰 刘永志 高文杰 胡雄超 Du Weifeng;Liu Yongzhi;Gao Wenjie;Hu Xiongchao(Optical Navigation and Detection Division,Shanghai Aerospace Control Technology Institute,Shanghai 200233,China;Military Representative Office Rocket Army Equipment Department in Tianjin Area,Tianjin 300308,China)

机构地区：[1]上海航天控制技术研究所光学导航与探测事业部,上海200233 [2]火箭军装备部驻天津地区军事代表室,天津300308

出　　处：《激光与光电子学进展》2020年第13期158-168,共11页Laser & Optoelectronics Progress

基　　金：高分青年基金(GFZX04061502)。

摘　　要：对空基光电对抗平台可见光变焦镜头进行了光机结构设计以及被动消热差设计,依据-20~50℃的工作温度指标要求,对变焦镜头进行光机热集成分析。用Patran软件对镜头加载温度应力,计算光机结构的热弹性变形,用Nastran软件解算热变形后各光学元件镜面节点的刚体位移。用Sigfit光机接口软件分析变形后每个透镜表面的Zernike系数,将结果导入Zemax中,预判镜片面型变化以及刚体位移变化对调制传递函数(MTF)与波前差的影响。实验结果表明,在-20~50℃的温度载荷下,后固定组的最大轴向位移可达6.107×10^-3 mm,严重影响了成像质量。通过挠性压圈实现轴向位移可控消热差设计,以减小温度载荷带来的影响。光机热集成分析表明,温度载荷下光学系统的MTF均大于0.3,满足技术指标要求。最后通过温度可靠性实验测试了变焦镜头的温度适应能力以及光机热集成分析的准确性,提供了一套高效、准确、适用范围广的光机热集成分析流程。In this paper,the opto-mechanical structure design and passive athermalization design for the visible-light zoom lens of space-based photoelectric countermeasure platform are carried out.According to the working temperature index requirement of-20-50℃,an integrated opto-mechanical-thermal analysis of the zoom lens is carried out.Patran software is used to load the temperature stress on the lens,and calculate the thermoelastic deformation of the optical structure.Nastran software is used to calculate the rigid body displacement of the mirror nodes of optical components after thermal deformation.The Zernike coefficient of each lens surface after deformation is analyzed by Sigfit optical interface software,and the results are imported into Zemax to predict the effect of lens surface change and rigid body displacement change on modulation transfer function(MTF)and wavefront difference.Experimental results show that under the temperature load of-20-50℃,the maximum axial displacement of posterior fixation group can reach 6.107×10^-3 mm,which seriously affects the imaging quality.In order to reduce the influence of temperature load,flexible pressure ring is used to realize the design of axial displacement controllable heat difference dissipation.Integrated opto-mechanical-thermal analysis show that the MTF values of the optical system under temperature load are all greater than 0.3,meeting the technical requirements.Finally,the temperature adaptability of the zoom lens and the accuracy of integrated opto-mechanical-thermal analysis are tested by temperature reliability experiment,which provides a set of efficient,accurate,and wide-ranging integrated opto-mechanical-thermal analysis process.

关 键 词：热响应 光电对抗平台 变焦镜头 光机热集成分析 被动消热差 

分 类 号：O436[机械工程—光学工程]