双色低温红外光学系统设计  

Design of two-color cold infrared optical system

作　　者：王晨锋 王晓伟 陆卫国[1] Wang Chenfeng;Wang Xiaowei;Lu Weiguo(Xi’an Institute of Optics and Precision 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：《红外与激光工程》2023年第12期148-156,共9页Infrared and Laser Engineering

基　　金：陕西省重点研发计划项目(2021GY-297);中国科学院青年创新促进会优秀会员基金项目(Y2021107)。

摘　　要：针对当前空间环境单一、红外波段探测目标虚警率高、灵敏度低等难题,提出了一种基于低温冷光学技术的双色红外光学系统设计方法。光学系统前置光路采用共口径式结构,通过分光平板进行谱段分光,然后采用中继镜组二次成像的方式实现冷阑匹配,保证系统的轻小型化。另外,为了提升长波系统的探测灵敏度,对其进行了低温冷光学设计,减小系统自身辐射对探测性能的影响。系统的工作波长为3.7~4.8μm和7.9~9.3μm,F数为1.2,光学结构三维总尺寸为260 mm×150 mm×80 mm,中波系统畸变小于2.8%,约有82%的能量集中在探测器的一个像元内,长波系统畸变小于0.33%,约有70%的能量集中在探测器的一个像元内。该系统可对空间弱目标进行远距离探测,具有虚警率低、灵敏度高、结构紧凑等优点。Objective For the current space environment single infrared band detection target false alarm rate is high,low sensitivity and other challenges,a double-color infrared optical system design method based on cold optical technology is proposed.The front optical path of the optical system adopts a common aperture structure,and the spectral band splitting is performed by a splitting plate,and the cold apparatus matching is realized by the secondary image of the relay mirror in order to ensure the light miniaturization of the system.In order to enhance the detection sensitivity of the long-wavelength system,a cold optical design is carried out to reduce the impact of the system's own radiation of detection performance.The working wavelengths are 3.7-4.8μm and 7.9-9.3μm,the F-number is 1.2,the total dimension of the optical structure is 260 mm×150 mm×80 mm,the aberration of the medium-wavelength system is less than 2.8%,about 82%of the energy is concentrated in a pixel of the detector,and the aberration of the long-wavelength system is less than 0.33%,about 70%of the energy is concentrated in one image element of the detector.The system can detect dim space targets at a long distance,and has the advantages of low false alarm rate,high sensitivity and compact structure.Methods The common optical systems included refractive,reflective and reflexive,and the different optical structures have their unique advantages and disadvantages.Refractive systems have no center obscuration and high efficiency,but the variety of optical materials is small and not easy to correct chromatic aberration.Secondary image system is easy to match the cold screen,the optical components are small in size and light in weight,but the number of pieces is more.After comprehensive consideration,the refractive secondary image system is selected.Results and Discussions According to the design index of infrared optical system and the design principle of light miniaturization and high energy transmission rate,it is decided to choose refractive second

关 键 词：低温光学设计 红外双色波段 共口径 弱目标探测 

分 类 号：O435.1[机械工程—光学工程]