大变倍比中波红外连续变焦光学系统设计  

Optical System Design of MWIR Continuous Zoom Lens with High Zoom Ratio

作　　者：张洪博[1] 闫阿奇[2] 何双亮[1] 张轲贻 王浩[2] Zhang Hongbo;Yan Aqi;He Shuangliang;Zhang Keyi;Wang Hao(China Astronaut Research and Training Center,Beijing 100094,China;Xi'an Institute Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,Shaanxi,China;Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]中国航天员科研训练中心,北京100094 [2]中国科学院西安光学精密机械研究所,陕西西安710119 [3]北京理工大学,北京100081

出　　处：《光学学报》2023年第12期194-201,共8页Acta Optica Sinica

基　　金：中国科学院青年创新促进会资助项目(2019395)。

摘　　要：针对新一代光电吊舱对轻小型长焦距高清红外变焦成像系统的迫切需求,采用分辨率为1280×1024、像元尺寸为15μm大面阵中波制冷红外探测器,设计了一款变倍比为48、焦距范围为25~1200 mm的中波红外连续变焦光学系统。为了实现小型化设计,采用二次成像、正组机械补偿、平滑换根、结合后组温阑切换变F数,以及光路巧妙折转的设计思路及方法,在保证100%冷阑效率的同时,实现了红外变焦系统的大变倍比与小型化设计。结果表明,该光学系统在-40℃~+60℃温度范围内具有良好的成像质量,且光学最大口径为230 mm,光学总长仅为350 mm,该系统具有结构紧凑、变倍比大、焦距长、分辨率高、成像质量良好等优点,可满足新一代红外成像系统的要求。Objective Infrared(IR)imaging technology has become a research hotspot in different countries because of its advantages such as not being limited by day and night,being able to work all day,strong ability to penetrate smoke,and good detection concealment.In recent years,with the development of highperformance and highresolution largearray IR detector technologies and the requirements of remote observation tasks such as border and coastal defense,various advanced IR imaging systems have emerged.The IR continuous zoom optical system is widely used in military and civilian fields.It can search for targets with a large field of view and observe distant targets with high resolution.In order to improve the IR system's ability to identify distant targets at long focal lengths while ensuring target search with a large field of view at short focal lengths,it is hoped that IR zoom optical system has a longer focal length and large zoom ratio.However,the longer focal length makes the diameter of the zoom optical system increase sharply.In addition to the inherent secondary spectrum,a large number of chromatic aberrations and advanced spherical aberrations in optical systems with long focal lengths will be introduced,which makes it difficult to design midwave infrared(MWIR)continuous zoom system with a large zoom ratio.Some scholars have also carried out relevant research and design work,but at present,the long focal length of the MWIR zoom system is less than 1000 mm;the detector resolution is mostly 640×512,and the optical path structure of the MWIR zoom optical system is complex and large.It is hard to meet the urgent demand of the new generation of photoelectric pods for highdefinition MWIR zoom imaging systems with compact sizes.Methods In order to realize a compact design of IR zoom lens with a large zoom ratio,we propose a design idea and method which adopt secondary imaging,positive group mechanical compensation of zoom lens,and smooth root replacement and introduce a warm shield by switching the rear group of the z

关 键 词：光学设计 红外变焦系统 中波红外 机械补偿 温阑 小型化 

分 类 号：TN216[电子电信—物理电子学]