基于Alvarez透镜的紧凑型红外连续变倍系统设计  

Design of Compact Infrared Continuous Optical Zoom System Based on Alvarez Lenses

作　　者：欧阳琦 柳萌遥 宁妍 曹杰[1,2] 郝群[1,2] 程阳[1,2] Ouyang Qi;Liu Mengyao;Ning Yan;Cao Jie;Hao Qun;Cheng Yang(Key Laboratory of Biomimetic Robots and Systems Ministry of Education,Beijing Institute of Technology,Beijing 100081,China;Yangtze Delta Region Academy of Beijing Institute of Technology,Jiacing 314003,Zhejiang,China;xi'an Modern Control Technology Research Institute,China North Industries Group Corporation Limited,Xi'an 710065,Shaanai,China)

机构地区：[1]北京理工大学仿生机器人与系统教育部重点实验室,北京100081 [2]北京理工大学长三角研究院(嘉兴),浙江嘉兴314003 [3]西安现代控制技术研究所,西安陕西710065

出　　处：《激光与光电子学进展》2024年第10期282-289,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62275017);嵩山实验室预研项目(YYJC072022008);北京理工大学青年教师学术启动计划(202204006)。

摘　　要：针对传统轴向移动机械光学变倍系统结构复杂、体积大的问题,提出基于Alvarez透镜的横向移动红外光学连续变倍系统。该系统由两组Alvarez透镜、光阑、定焦透镜和红外探测器组成。两组Alvarez透镜构成开普勒式望远结构,其中,第一组Alvarez透镜作为变焦组,第二组Alvarez透镜作为补偿组。无限远入射光线经过两组Alvarez透镜后出射,出射的平行光通过定焦透镜聚焦成像到红外探测器的靶面上。使用Zemax软件进行光学仿真,该光学变倍系统覆盖8~12μm的长波红外波段,最大视场角为6°,最大入瞳直径为6 mm,F数为2,畸变量小于2.1%,光学总长度约为74 mm。Alvarez透镜仅需横向移动约1 mm即可实现5×到15×的连续光学放大。该系统在红外探测器分辨率为320×240、像元尺寸为30μm时调制传递函数达到0.5@17 lp/mm。仿真设计结果表明,该系统具有放大倍率大、结构紧凑、成像质量高的优点,有望应用于小型化红外变倍成像领域。t In this study,a transverse moving infrared optical continuous zoom system based on the Alvarez lens is proposed to address the challenges associated with the complex structure and large volume of traditional axial-moving mechanical optical zoom systems.The system consists of two sets of Alvarez lenses,apertures,focusing lenses,and infrared detectors.Herein,two sets of Alvarez lenses adopt a Kepler-type telescope structure,where the first set of Alvarez lenses functions as the zoom group and the second set of Alvarez lenses serves as the compensation group.The infinitely far incident light passes through two sets of Alvarez lenses and exits,the emitted parallel light is then focused and imaged onto the target surface of the infrared detector through a fixed focal lens.Utilizing Zemax software for optical simulation,our designed optical zoom system covers the 8-12μm long wave infrared band,with a maximum field of view angle of 6°,a maximum pupil diameter of 6 mm,an F-number of 2,distortion of<2.1%,and a total optical length of~74 mm.The Alvarez lens only requires to be horizontally moved by~1 mm to achieve continuous optical magnification from 5X to 15X.Moreover,the modulation transfer function of the proposed optical zoom system can attain up to 0.5@17 lp/mm,assuming a resolution of 320X240 and pixel sizes of 30μm for the infrared detector.The simulation results indicate that the system has the advantages of high magnification,a compact structure,and high imaging quality,making it a promising candidate for applications in the field of miniaturized infrared zoom imaging.

关 键 词：光学设计 Alvarez透镜 光学变倍系统 开普勒结构 红外成像 

分 类 号：O436[机械工程—光学工程]