基于相位测量偏折术的透明物体表面缺陷检测

doi:10.16180/j.cnki.issn1007-7820.2024.05.009

摘要/Abstract

摘要：

目前国内对玻璃、透镜等透明物体的质量控制仍使用传统方法,传统的肉眼评估方法效率低下。为实现透明物体表面缺陷的自动化检测,提出一种基于相位测量偏折术(Phase Measuring Deflectometry,PMD)的透射式检测方法。利用结合了新相移图案生成计算式的PMD算法生成结构光条纹图案,使用透射式系统将该条纹图案投射到被测物体表面。相机采集经被测物体折射后的变形条纹图片,生成绝对相位图,通过识别绝对相位图中的局部畸变提取缺陷。通过分析周期错位导致误检的原因,提出一种绝对相位周期错位修正的方法。新相移图案生成计算式能提前修正周期错位现象,二者结合使用能提高相位展开的精度。以焦距为300 mm的凹、凸透镜为例进行实验,结果表明该方法能准确地提取出因表面缺陷导致的绝对相位图中的局部畸变,精度为0.1 mm。

关键词: 透明物体, 表面缺陷自动化检测, 相位测量偏折术, 结构光条纹图案, 透射式系统, 相位展开, 局部畸变, 周期错位

Abstract:

At present,the traditional method is still used to control the quality of glass,lens and other transparent objects in China,and the traditional visual evaluation method is inefficient.In order to realize automatic detection of surface defects of transparent objects,a transmission detection method based on PMD(Phase Measuring Deflectometry) is proposed.The structure light fringe pattern is generated by PMD algorithm combined with the new phase shift pattern generation formula,and the fringe pattern is projected to the surface of the measured object using the transmission system. The distorted fringe image after refraction of the measured object is collected by the camera,then the absolute phase diagrams are generated, and the defects are extracted by identifying the local distortion in the absolute phase diagram.Through analyzing the reason of false detection caused by periodic misalignment,a method of correcting absolute phase periodic misalignment is proposed. The new formula of phase shift pattern generation can also correct periodic misalignment in advance,the combination of the two methods can improve the precision of phase unwrapping. A concave and convex lens with a focal length of 300 mm is taken as an example, the experimental results show that the proposed method can accurately extract the local distortion in the absolute phase diagram caused by surface defects with an accuracy of 0.1 mm.

Key words: transparent object, automatic detection of surface defects, phase measuring deflectometry, structured light stripe pattern, transmission system, phase unfolding, local distortion, misalignment of periods

中图分类号:

TP391

丁玉洁, 周志峰, 王勇, 王立瑞. 基于相位测量偏折术的透明物体表面缺陷检测[J]. 电子科技, 2024, 37(5): 62-70.

DING Yujie, ZHOU Zhifeng, WANG Yong, WANG Lirui. Surface Defect Detection of Transparent Objects Based on Phase Measuring Deflectometry[J]. Electronic Science and Technology, 2024, 37(5): 62-70.

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