机载紧凑型中波红外相机的设计  

Design of Compact Middle-Wave Infrared Camera Used on Airborne Platform

作　　者：徐新行[1,2] 陈宁[1] 王兵[1] 高云国[1] 杨洪波[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 [2]中国科学院大学,北京100049

出　　处：《中国激光》2014年第8期294-299,共6页Chinese Journal of Lasers

基　　金：国家863计划(2011AA7031024G);吉林省自然科学基金(201115123)

摘　　要：为了实现机载光电跟瞄系统的捕获与跟踪功能,针对机载环境狭小的空间设计了一款紧凑型中波红外相机。首先从机载平台的应用需求出发,提出了红外相机的各项性能指标。然后,采用二次成像与二次折转的方案对红外相机的光学系统进行了设计与优化,并研制出一套高精度调焦平台用以光学系统的距离与温度调焦;采用箱体式结构方案对红外相机的支撑基座进行了优化设计,有限元分析结果表明所设计的支撑基座具有足够的结构刚度。最后,在完成机载中波红外相机精密加工、装配与调试的基础上,采用光电测试平台对红外相机的焦距、视场角、噪声等效温差(NETD)和调制传递函数(MTF)等参数进行了实验检测。结果显示:相机的焦距、视场角等与理论设计较为符合,NETD为22mK,在探测器的极限空间频率处相机的MTF不低于0.58,接近衍射极限水平。因此,所研制的机载紧凑型中波红外相机工作灵敏度高、成像质量好,满足机载平台的应用需要。In view of the small space of flying cabin, a compact middle-wave infrared camera is designed for optical- electricity tracking and pointing system used on the airborne platform. Firstly, requisite performances of infrared camera is put forward on the basis of applying requirements of airborne platform. Then, optics system including two- time imaging and double reflecting is designed and optimized. A fine focusing mechanism is developed for temperature focusing and distance emendation. A trunk supporting base is designed and its structural rigidity is analyzed by finite element method. Finally, focus, visual angle, noise equivalent temperature difference （NETD） and modulation transfer function （MTF） of infrared camera are tested by optical-electricity testing platform after finely manufacturing, assembling and adjusting. The results show that focus and visual angle agree with design parameters, the measurement NETD is 22 mK, MTF is higher than 0. 58 in Nyquist frequency of CCD which approaches diffraction limit level. Therefore, the designed infrared camera with high sensitivity and good imaging quality can satisfy application requirements of airborne platform.

关 键 词：光学设计 机载 红外相机 调焦平台 结构刚度 

分 类 号：TH703[机械工程—仪器科学与技术]