制冷型长波红外光学系统设计  

Design of cooled long-wavelength infrared imaging optical system

作　　者：单秋莎[1,2] 谢梅林 刘朝晖[1] 陈荣利[1] 段晶[1,2] 刘凯[1] 姜凯 周亮[1] 闫佩佩[1] SHAN Qiu-sha;XIE Mei-lin;LIU Zhao-hui;CHEN Rong-li;DUAN Jing;LIU Kai;JIANG Kai;ZHOU Liang;YAN Pei-pei(Xi’an Institute of Optics and Pecision Mechanics,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：《中国光学》2022年第1期72-78,共7页Chinese Optics

基　　金：国家自然科学基金(No.61805275);中国科学院“西部之光”人才培养引进计划(No.XAB2017B27)。

摘　　要：针对640×512长波红外制冷型探测器,设计了一种制冷型长波红外光学系统,用于对目标的红外跟踪探测。该光学系统采用二次成像结构以达到100%冷光阑效率,采用锗和硫化锌玻璃材料相结合,实现了像差校正和消色差设计,通过引入高次非球面,很好地校正了系统的高级像差,简化了系统结构。光学系统由6个镜片构成,焦距为400 mm,工作波段为7.7~9.3μm,视场角为1.37°×1.10°,F数为2。设计结果表明:在空间频率33 lp/mm处,轴外视场MTF>0.24,接近衍射极限,具有较高的成像品质。在−35~+55℃工作温度范围内,通过内置调焦镜调焦来保证高温、低温环境下的成像质量,可用于宽温度范围内的红外跟踪探测。Aiming at 640×512 long-wavelength infrared cooled detectors,a cooled long-wavelength infrared optical system was designed to track and detect an infrared target.The optical system adopts the secondary imaging structure to ensure 100%cold-shielding efficiency,and adopts a combination of optical material Ge and ZnS to achieve aberration correction and achromatic design.By introducing the high-order aspheric surface,the high aberration of the system is well-corrected,thus the system structure is simplified.The optical system is composed of 6 lenses.The focal length is 400 mm,the working bands are 7.7~9.3μm,the field of view is 1.37°×1.10°,and the F-number is 2.The design results show that at a spatial frequency of 33 lp/mm,the MTF of off-axis field of view is more than 0.24,which approaches the diffraction limit and has high imaging quality.In the operating temperature range of−35~+55℃,the focusing lens is used to ensure the imaging quality under high and low temperature environments,which can be used for infrared tracking detection over a wide range of temperatures.

关 键 词：制冷型 二次成像 高次非球面 调焦镜 

分 类 号：O435.1[机械工程—光学工程]