变光阑长波红外连续变焦光学系统设计  

Design of LWIR Continuous Zoom Optical System with Variable Diaphragm

作　　者：唐晗[1] 周春芬 冯建伟[1] 张巍[1] 普龙[1] 曹凌[1] 马文怡谷 王宏波 毕宇波 蒋旭科 张麟 李虹明 TANG Han;ZHOU Chunfen;FENG Jianwei;ZHANG Wei;PU Long;CAO Ling;MAWEN Yigu;WANG Hongbo;BI Yubo;JIANG Xuke;ZHANG Lin;LI Hongming(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：《红外技术》2024年第5期491-500,共10页Infrared Technology

摘　　要：非制冷长波连续变焦光学系统由于相对孔径大导致小型化和无热化设计困难,本文采用可变光阑约束物镜尺寸压缩系统总长,实现长波640×512非制冷连续变焦光学系统轻小型化设计。通过材料合理配置及主动补偿实现5片透镜的8.5×连续变焦光学系统消热设计。该系统F#恒定1.2、工作波段为8~12μm、视场变焦范围为30°×24°~3.5°×2.8°、系统总长187.5 mm,该连续变焦光学系统重量轻、总长短、透过率高、在-40℃~+60℃温度范围全视场成像质量良好。Miniaturization and athermalization design of uncooled long-wave infrared(LWIR)continuous zoom optical systems is difficult given the large relative aperture.The lightweight and miniaturization design of an LWIR continuous zoom optical system with an uncooled focal plane array detector for 640×512 pixels was realized by restraining the object lens size and total length of the system by using a variable diaphragm.Through reasonable material configuration and an active compensation method,the athermalization design of a continuous zoom optical system with a zoom ratio of 8.5 and five lenses was achieved.The system F number is constant at 1.2,the spectral range is 8mm to 12μm,the field of view(FOV)ranges from 30°×24°to 3.5°×2.8°,and the total length of the system is 187.5 mm.This optical system exhibits light weight,short total length,and high transmittance.Within the temperature range of-40℃to+60℃,the optical system affords good image quality in the full field of view during zooming.

关 键 词：非制冷长波 连续变焦光学系统 可变光阑 消热差 

分 类 号：TN216[电子电信—物理电子学]