非制冷长波红外连续变焦光学系统的一种无热化设计  

Athermalization Design of Uncooled Long Waveband Infrared Continuous Zoom Optical System

作　　者：唐玉凤 毛珊 宋逸辰 赖涛 袁沛琦 丁骁炜 赵建林[1] Tang Yufeng;Mao Shan;Song Yichen;Lai Tao;Yuan Peiqi;Ding Xiaowei;Zhao Jianlin(Shaanxi Key Laboratory of Optical Information Technology,Key Laboratory of Light-Field Manipulation and Information Acquisition,Ministry of Industry and Information Technology,School of Physical Science and Technology,Northwestern Polytechnical University,Xi’an 710129,Shaanxi,China)

机构地区：[1]西北工业大学物理科学与技术学院,光场调控与信息感知工业和信息化部重点实验室,陕西省光信息技术重点实验室,陕西西安710129

出　　处：《光学学报》2024年第7期150-158,共9页Acta Optica Sinica

摘　　要：为了满足长波红外(LWIR)热像仪在宽温度范围下连续变焦的需求,基于LWIR 320 pixel×320 pixel型红外探测器,设计了一款非制冷长波红外连续变焦光学系统。该系统可在宽温度范围下实现无热化,采用常见的硫系玻璃,工作波段为8~12μm,总长为200 mm,仅由7片透镜组成。通过引入偶次非球面,可以使系统色差和轴外像差得到良好的校正,同时选用后固定组的最后一片透镜充当温度补偿组来调节焦距实现无热化。分析结果表明,该系统结构紧凑,可以在-40~60℃温度范围内和60~180 mm焦距范围内连续平滑变焦,并且全程成像质量良好(调制传递函数在20 lp/mm处均大于0.3),变焦和公差也具有良好的可实现性。Objective Compared with the traditional visible light imaging technology,infrared spectral thermal imaging technology utilizes the thermal radiation emitted by objects to obtain images of target objects,with unique advantages in target detection and tracking.Particularly in the long-wave infrared(LWIR)bands,it demonstrates superior transmittance,increased propagation distance,and enhanced detection performance.Consequently,infrared cameras possess application significance in the high-end commerce,monitoring,and other fields.However,conventional thermal imaging cameras are limited by a fixed focal length,which enables observation only within a specific field of view or area and hampers search and observation capabilities.To this end,the infrared zoom thermal imaging camera is developed.By continuously adjusting the field of view and magnification relationship via a continuous zoom optical system,seamless range size adjustment is achieved,with stability and image clarity maintained.However,the majority of existing LWIR zoom systems incorporate diffractive surfaces,which results in complex design requirements,elevated processing and assembly demands,and increased system costs.Furthermore,the design of certain LWIR zoom systems overlooks the influence of ambient temperature on image quality,subsequently compromising practicality.Thus,it is imperative to devise a lowcost,compact,and uncooled long-wave infrared continuous zoom optical system that preserves excellent image quality across a wide range of temperature variations and exhibits strong practicality.We aim to make the design outcomes contribute to advancements in military weapon targeting,handheld thermal imaging cameras,unmanned vehicles,and related fields.Methods To meet the requirements of the specific application environment,we have determined the appropriate initial structure for the design.The mechanical positive group compensation method is chosen as the compensation technique for the system.Additionally,the introduction of sulfur glass helps control chr

关 键 词：光学设计 红外变焦系统 长波红外 像质评价 

分 类 号：O436[机械工程—光学工程]