基于光机热集成设计分析,设计了一种扩展中波红外定焦镜头光机系统(焦距f=60 mm,工作波段2.5~5.3 μm),在设计光学系统和光机结构时就充分的考虑了环境温度、系统热变形对光学性能的影响,建立了镜头组的有限元模型,并基于-40~+60 ℃的实际温度载荷展开了热力学分析,对热分析后各镜片的节点位移和面型变化通过Zernike多项式作为数据接口导入光学设计软件,给出了各典型温度值下镜头组的传递函数图。分析结果表明,在-40~+60 ℃区间红外镜头的各个视场成像质量良好,所设计的红外镜头结构可靠、简洁,能够满足设计和使用要求。

An extended mid-wave infrared prime lens is designed whose focus is 60 mm and working waveband is 2.5~5.3 μm. The design was based on opto-mechanical-thermal design and analysis. During the design of the lens the influence of the environmental temperature was considered. The finite element model of the lens was set up. Finally the data interface was imported which included nodal displacement and surface changes of each lens into optical design software with Zernike polynomial. The transfer function of the lens group was solved. The analysis results of the transfer function showed that each field of view of the lens was in good imaging quality during -40~+60 ℃ and could be able to meet the design and use requirements.