双远心数字条纹投影的光学系统设计

王雅楠; 万新军; 韦晓孝; 张薇

光学技术, 2018, 44 (6): 667, 网络出版: 2019-01-10

双远心数字条纹投影的光学系统设计

Design of optical system for Bi-telecentric digital fringe projection

论文大纲

王雅楠 ^*万新军韦晓孝张薇

作者单位

上海理工大学光电信息与计算机工程学院, 上海 200093

摘要

针对3D自动检测PCB板缺陷的实际应用问题, 设计了一款高分辨率、大景深、大视场的双远心数字条纹投影光学系统, 实现了大面积区域均匀投影。分析了基于0.65 WQXGA DMD的双远心数字条纹投影系统的工作原理及设计指标; 设计了基于复眼透镜阵列的LED匀光照明系统, 在DMD照明面内的照明均匀性为90.5%, 且能量利用率为45.8%; 设计了双远心结构的投影光学系统, 投影视场为66.5mm×37.5mm, 并在全视场范围内分辨率在8 lp/mm处的MTF值大于0.5。利用光学软件建立双远心数字投影整体系统模型, 仿真结果表明, 被投影区域均匀性为90.8%, 投影条纹在+/-7.5mm的离焦范围内投影清晰且周期均匀, 综合提高了3D 自动检测系统的投影质量。

Abstract

The design of an optical system for bi-telecentric digital fringe projection in the 3D Automatic Optical Inspection (AOI) of print circuit boards (PCB) is introduced. The designed fringe projection optical system features high resolution, large depth of view, and uniform projection in a large field of view (FOV). The design principle and major target parameters are analyzed around an optical projection system based on 0.65 WAXGA Digital Micro-Mirror Device(DMD). A LED uniform illumination system is designed, which realizes illumination uniformity of 90.5% in the DMD active area and energy efficiency of 45.8%. A bi-telecentric projection system is then designed with a FOV of 66.5mm×37.5mm and the MTF at 8lp/mm is more than 0.5 within the whole FOV. A combined system model with both the LED illumination and the optical projection is built and the simulation demonstrates that the final projection uniformity reaches 90.8% and the projected fringes remain clear within a depth of focus of +/-7.5mm, which improves the projection quality of 3D AOI systems.

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王雅楠, 万新军, 韦晓孝, 张薇. 双远心数字条纹投影的光学系统设计[J]. 光学技术, 2018, 44(6): 667. WANG Yanan, WAN Xinjun, WEI Xiaoxiao, ZHANG Wei. Design of optical system for Bi-telecentric digital fringe projection[J]. Optical Technique, 2018, 44(6): 667.

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