钢板表面缺陷检测光学系统的设计

为满足钢板表面缺陷在线检测系统宽幅面、高速、高分辨率的检测要求,优化设计了钢板表面缺陷视觉检测系统的光学部分.采用了一种新型LED线光源获得高强度均匀照明,多线阵CCD拼接成像完成幅面分割.明、暗域相结合的成像模式确保了大部分缺陷的有效检出.综合考虑光源、镜头与线阵CCD的影响,计算并优化选取了光学镜头的焦距、f数和视场角等参数以满足检测需要,整个光学系统设计满足在线检测需要并在样机中得以应用.

Design of Optical System for Surface Defect Detection of Steel Str

In order to satisfy the requirements of broad width, high speed, high resolution for steel strip inspection product line, optical part of surface defect visual inspection system is optimally designed. A new LED line light source is adopted to obtain a high intensity and uniform illumination, and field of view is partitioned by means of multiple linear CCD sensors parallel imaging. Owing to the combination of bright-field and dark-field receiving image modes, most surface defects of interest are ensured to be effectively detected. Taking the matching of light source, optical lens and linear CCD sensor into account, focal distance, f-number and field angle of lens are calculated and optimally selected to meet the need of high speed and high resolution. The whole optical system design adapts to the demand of online inspection for steel strip surface defect and has already been used in prototype system.