外视场拼接的单镜头大视场中波红外成像系统的实现  

Realized large field of view infrared imaging system of single lens with external field splicing

作　　者：单秋莎[1,2] 苏秀琴 段晶[1,2] 周亮[1] 刘凯 闫佩佩[1] 姜凯[1] Shan Qiusha;Su Xiuqin;Duan Jing;Zhou Liang;Liu Kai;Yan Peipei;Jiang Kai(Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences,Xi’an 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China)

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]中国科学院大学,北京100049

出　　处：《红外与激光工程》2020年第3期322-327,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(61805275);中国科学院"西部之光"人才培养引进计划(XAB2017B27)。

摘　　要：基于外视场拼接原理,研制一套大视场中波红外原理样机。设计一制冷型中波红外光学系统。采用光学系统出瞳与冷屏重合的二次成像结构形式,保证系统具有100%冷光阑效率。工作波段为3.7~4.8μm,焦距为40 mm,相对孔径为1:2,全视场角为21.74°×17.46°(27.88°),系统总长145 mm。采用孔/反射镜分时成像的外视场拼接,实现2×1视场扩展。设计结果表明:在空间频率21 lp/mm处,轴外视场MTF>0.68,接近衍射极限。系统结构紧凑,成像质量较高。利用原理样机完成可行性和合理性验证。Based on the principle of external field splicing, a principle prototype of large-field mid-wave infrared was developed. A cooled mid-wave infrared optical system was designed. The secondary imaging structure of the optical exit aperture coincides with the cold screen was adopted to make sure 100% cold shielding efficiency of the system. The working wave band was 3.7-4.8 μm, the focus was 40 mm, the relative aperture was 1:2, the full field of view was 21.74°×17.46°(27.88°), the total length of the system was 145 mm. The principle of external field splicing with time-sharing exposure imaging of holes/mirrors was adopted, 2×1 field of view expansion was realized. The design result show that MTF>0.68 of the off-axis field of view at spatial frequency of 21 lp/mm,which closes to the diffraction limited. The system has compact constructure and has high imaging quality. The feasibility and rationality of the splicing principle were verified using prototype.

关 键 词：分时曝光 外视场拼接 视场扩展 

分 类 号：TN216[电子电信—物理电子学]