基于机器视觉检测的大视场双远心光学系统设计

基于机器视觉的大视场非接触精密检测的需求,参照卡尔蔡司公司的TVM150／11／0．1远心镜头指标,设计了一款大视场双远心光学系统。采用了近对称的结构和半部设计的设计思路,较好地控制了畸变和倍率色差,实现了长工作距离（大于160mm）、大视场（物方视场达到西150mm）、低畸变（最大畸变小于1个像素）、高分辨（在2／3″CCD全视场200lp／mm处光学传函优于0．3）、宽景深（设计景深达到了±38mm）和双远心系统的设计要求。着重分析了系统各器件偏心对畸变的影响,通过对关键器件的偏心控制,有效地抑制了由于生产制造过程中的偏差产生的随机畸变对测量误差的影响,从而为实际生产提供了理论指导。

Design of Double Telecentric System Based on Machine Vision Measurement

Using the specifications of TVM150/ll/0. t telecentric lens from Carl Zeiss as the reference, a large field double telecentric optical system is designed, which satisfies the requirements for the non-contact precision metrology in machine vision. A near-symmetric configuration is adopted to realize a double telecentric system featuring long working distance （〉160 mm）, large field （object side field is 150 mm） , very low distortion （less than single pixel）, high resolution （MTF）0. 3 at 200 lp/mm for full field region of the 2/3″ CCD sensor） with excellent control of distortion lateral color. Through the analysis of individual element＇s decentration on the distortion and decentering control of critical elements, the measurement errors introduced during lens fabrication process are effectively contained. The approach adopted provides a valuable theoretical guidance for the mass production.