紧凑低成本非制冷长波红外连续变焦光学设计  

Compact and low-cost uncooled LWIR continuous zoom optical design

作　　者：唐晗[1] 郑万祥 曾兴容 杨丹[1] 周春芬 曹凌[1] 徐曼[1] 李洪兵[1] 杨开宇[1] Tang Han;Zheng Wanxiang;Zeng Xingrong;Yang Dan;Zhou Chunfen;Cao Ling;Xu Man;Li Hongbing;Yang Kaiyu(Kunming Institute of Physics,Kunming 650223,China)

机构地区：[1]昆明物理研究所,云南昆明650223

出　　处：《红外与激光工程》2023年第4期182-192,共11页Infrared and Laser Engineering

基　　金：国家重点研发计划(0701200)。

摘　　要：随着红外技术的快速发展,SWaP-C(尺寸小、质量轻、功耗低、成本低)概念已深入红外热像仪整机设计全过程。在非制冷连续变焦红外热像仪设计中,相对已模块化的非制冷探测器与成像电路、光学系统影响整机包络尺寸、产品质量及价格成本,因此设计一款总长短、质量轻、成本低、性能高的非制冷长波红外连续变焦光学系统将具有广阔的市场前景。非制冷长波红外连续变焦光学因相对孔径大、光学材料种类少等因素存在系统小型化和无热化设计难题,通过采用变F#设计方法约束物镜尺寸;利用三组联动变焦技术平衡像差、压缩系统总长;通过主动补偿的消热差技术使得系统在-40~+60℃温度范围成像质量良好,实现四片透镜构成的非制冷长波红外连续变焦光学系统设计。该系统工作波段为8~12μm,焦距变化范围为20.7~126 mm,对应F#为1.05~1.2,视场变化范围为21°×16.8°~3.5°×2.8°,变倍比为6.0×,最大物镜直径116 mm,光学系统总长180 mm,光学零件总质量418 g。该光学系统具有轻小型、高性能、低成本等SWaP-C特征,将在无人装备平台及手持热像仪设备中得到广泛应用。Objective With the rapid development of infrared technology,the concept of SWaP-C(small size,light weight,low power consumption and low cost)has been expanded from infrared detector to the whole design process of infrared thermal imager.In the design of uncooled continuous zoom infrared thermal imager,compared with the modularized uncooled detector and imaging circuit,the optical system affects its envelope size,product weight and price cost.A light,small,low-cost,high-performance uncooled infrared optical system needs to achieve the following five goals.First,the number of lenses is as small as possible.Second,the length of the optical system is short.Third,the diameter of the large objective lens is small.Fourth,the optical system has high MTF.Fifth,the optical system has good environment adaptability.Therefore,the design of an uncooled LWIR continuous zoom optical system with short length,light weight,low cost and high performance will have broad market prospects.Methods There are difficulties in miniaturization and athermalization design of uncooled LWIR continuous zoom optical system due to its large relative aperture and few kinds of infrared optical materials.The purpose of compressing the total length of system and balancing aberration is achieved by using three groups of linkage zoom technology.Through the active compensation of athermalization technology,the system has good imaging quality in the temperature range of−40-60℃.The specific design process of the optical system is as follows.Firstly,the calculation program is compiled according to the three groups of linkage continuous zoom models.According to the design index,the initial optical form is calculated by considering the total optical length,lens focal length distribution and lens spacing.The parameters are input into Zemax optical design software to establish the ideal optical model.Secondly,the shape and material are reasonably selected according to the focal length of the lens,and the evaluation function is set to enter the optimization a

关 键 词：非制冷长波红外 连续变焦光学系统 变F#设计 三组联动变焦 无热化 

分 类 号：TN216[电子电信—物理电子学]