大视场大相对孔径长波红外扫描光学系统设计  

Design of long-wave infrared scan system with large field and large aperture

作　　者：范哲源[1,2] 杨洪涛[1,2] 屈恩世[1] 张建[1] 曹剑中[1] 张志[1] 陈卫宁[1] 武力[1] 

机构地区：[1]中国科学院西安光学精密机械研究所,陕西西安710119 [2]中国科学院研究生院,北京100049

出　　处：《红外与激光工程》2012年第10期2740-2744,共5页Infrared and Laser Engineering

基　　金：国家863计划(2008AA09A403)

摘　　要：采用288×4线阵探测器及二次成像方式设计了一种工作于7.5～10.5μm的大视场大相对孔径长波红外扫描型光学系统,系统凝视视场角为28°×21°,采用摆镜同楔形镜扫描扩展后系统视场角为78°×57°,该系统具有大相对孔径、F数为1.67、高成像质量等特点。由于长波红外可用材料有限,设计中采用锗材料和硒化锌材料校正色差,引入非球面校正系统球差,系统设计结果显示其成像质量接近衍射蓟县,色差矫正良好,在空间频率为20 lp/mm处,调制传递函数(MTF)均在0.3以上,能量集中度大于70%。Using 288×4 detector with secondary imaging, a long-wave scan optical system with large field and large aperture working at 7.5～10.5μm was designed. The system had advantages of large aperture, high image quality etc. The number of F was 1.67 ,FOV was 28°×21°, which extended to 78°×57° after adopting scan mirror and dual-wedge prism. Because there were a limited number of lens materials used in MWIR spectral bands, to balance chromatic aberration, the ZnSe material and Germanium material were adopted, aspheres were adopted to balance sphere aberrations. The results show that the optical performance approximates to the diffraction limit and the design has better achromatic performance. The modulation transfer function （MTF） is above 0.3 at spatial frequency of 20 lp/mm and energy concentration ratio is greater than 70% within the sensing element of the detector.

关 键 词：光学系统设计 楔形镜 长波红外 大相对孔径 调制传递函数 

分 类 号：O435[机械工程—光学工程]