为了满足基于机器视觉的复杂零件表面质量在线实时检测的需求, 根据双远心成像原理和像差理论基础, 采用ZEMAX光学设计软件, 设计了一款大视场宽景深的双远心光学系统。所设计的系统仅由6块透镜组成, 工作波长在可见光范围内, 系统放大率为-0.061, 工作距离大于390mm,最大视场达到180mm。结果表明, 光学系统的最大畸变小于0.1%, 景深范围达到80mm,调制传递函数在全视场100lp/mm处大于0.4, 远心度最大值控制在0.012°内;各种像差均得到很好的矫正, 像质优良。该设计结构符合双远心系统的总体设计要求。

In order to meet the requirements for online real-time detection of complex surface quality of parts based on machine vision, based on the double telecentric imaging principle and aberration theory, a double telecentric optical system with wide field of view and large depth of field was designed by using ZEMAX optical design software. The system consisted of six lenses, with working wavelength of the visible range, system magnification of -0.061, working distance greater than 390mm and the maximum field of view of 180mm. The results show that the maximum distortion of optical system is less than 0.1%, the range of depth of field reaches to 80mm, the modulation transfer function in the whole field of 100lp/mm is greater than 0.4 and the maximum of telecentric is controlled within 0.012°. Various aberrations are corrected very well and the image quality is good. The design of structure meets overall design requirements of double telecentric system.