中国激光, 2014, 41 (8): 0816002, 网络出版: 2014-06-13
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
光学设计 机载 红外相机 调焦平台 结构刚度 optical design airborne platform infrared camera focusing mechanism structural rigidity
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22 mK,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。
Abstract
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.
徐新行, 陈宁, 王兵, 高云国, 杨洪波. 机载紧凑型中波红外相机的设计[J]. 中国激光, 2014, 41(8): 0816002. Xu Xinhang, Chen Ning, Wang Bing, Gao Yunguo, Yang Hongbo. Design of Compact Middle-Wave Infrared Camera Used on Airborne Platform[J]. Chinese Journal of Lasers, 2014, 41(8): 0816002.