可变焦距机器视觉镜头光学系统设计  

Optical system design of zoom lens for machine vision systems

作　　者：刘巧玲[1] 陈丽娜[1] 余华恩 柯华恒 梁秀玲[1] 

机构地区：[1]福建师范大学光电与信息工程学院福建省光子技术重点实验室,福建福州350007

出　　处：《应用光学》2015年第2期199-205,共7页Journal of Applied Optics

基　　金：福建省科技厅工业科技重点项目资助(2012H0020)

摘　　要：在机器视觉系统中,镜头的主要作用是将目标成像在图像传感器的光敏面上。针对生产过程中机器视觉系统在保持工作距离不变的情况下需获得不同的放大倍数,采用机械补偿形式,利用Zemax软件设计了一款可用于机器视觉的可见光多焦点变焦物镜系统。该系统工作距离可以在290mm^340mm范围内变化,实现了焦距从10mm^100mm的10倍多焦点变焦。设计结果表明:该变焦物镜最大畸变小于1%,最大兼容0.84cm(1/3英寸)CCD图像传感器。用调制传递函数对系统的成像性能进行评估,该系统在空间频率100lp/mm处调制传递函数大于0.3,满足成像要求。In machine vision systems ,lens is mainly responsible for imaging object on photosen‐sitive surface of image sensor .Based on machine vision systems ,the mechanical compensated zoom was adopted ,the Zemax software was used to design a visible multifocal zoom lens sys‐tem that could be applied in machine vision systems to address some specific situation w hile dif‐ferent magnification were required but working distance remained unchanged during produc‐tion .The system has the working distance from 290 mm to 340 mm and the focal length chan‐ging from 10 mm to 100 mm ,which makes 10 times multifocal zoom possible .The results show s that for this multifocal zoom lens ,the maximum distortion is less than 1% ,and it can best hold 1/3 inch CCD image sensor .The system imaging performance was assessed by modu‐lation transfer function(MTF) ,and MTF is greater than 0 .3 at the frequency of 100 lp/mm , w hich meets the imaging demands .

关 键 词：光学设计 变焦系统 机械补偿变焦 机器视觉 

分 类 号：TB851[一般工业技术—摄影技术]