摘要
为满足闭路监控电视(closed-circuit television,CCTV)对宽视场角、低温度漂移和高清成像的要求,设计了一款超大光圈的闭路监控电视镜头,该镜头由6片常用球面玻璃透镜和2片常用非球面塑胶透镜组成,光圈可达1.2,视场角120°,焦距5 mm,总长度小于32 mm,波长范围为436~950 nm,探测器尺寸为1/1.8″(16∶9)。结果表明,该镜头在-40~80℃环境温度内具有低温度漂移,在奈奎斯特频率为120 lp/mm处,在-40℃下全视场调制传递函数(MTF)均大于0.4,20℃下全视场MTF均大于0.3,80℃下全视场MTF均大于0.2。相较于目前已有的安防镜头,本文设计的镜头具有高照度、宽视场角、低温度漂移等优点,公差要求满足现代加工水平,且结构紧凑、易于装调、成本低,可广泛用于安防等领域。
In order to meet the requirements of wide field of view,low temperature drift and high-definition imaging of closed-circuit television,we design a super large aperture closed circuit television lens.The lens are composed of 6 pieces of common spherical glass lenses and 2 pieces of common aspherical plastic lenses with a focal length of 5 mm,an aperture of 1.2,a field of view(FOV)of 120°,and the total length is less than 32 mm.The wavelength range is 436-950 nm,and the detector size is 1/1.8"(16∶9).The simulation results show that the lens has low temperature drift in the temperature range of-40-80℃.At the Nyquist frequency of 120 lp/mm,the modulation transfer function(MTF)is greater than 0.4 at-40℃,0.3 at 20℃and 0.2 at 80℃.Compared with the existing security lenses,this design has the advantages of high illuminance,wide field of view,low temperature drift and the tolerance requirements meet the modern processing level.The structure is compact,easy to assemble,low cost,and can be widely used in security and other fields.
作者
钱楷
刘长进
张天安
俞本立
廖志龙
邱达
张源
QIAN Kai;LIU Changjin;ZHANG Tianan;YU Benli;LIAO Zhilong;QIU Da;ZHANG Yuan(College of Intelligent Systems Science and Engineering,Hubei Minzu University,Enshi 445000,Hubei,China;Jiaozhong Optical Technology Co.,Ltd.,Ningbo 315040,Zhejiang,China;Key Laboratory of Opto-Electronic Information Acquisition and Manipulation,Ministry of Education,Anhui University,Hefei 230601,Anhui,China;School of Physics and Technology,Wuhan University,Wuhan 430072,Hubei,China)
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2022年第5期567-573,共7页
Journal of Wuhan University:Natural Science Edition
基金
国家自然科学基金(61665002)
湖北民族大学高水平科研成果校内培育项目(PY21005)
关键词
光学设计
监控镜头
日夜共焦
超大光圈
广角
optical design
monitoring lens
day and night confocal
super large aperture
wide angle
