基于光学低相干的焊缝外观特征检测  

Weld Appearance Feature Detection Based on Optical Low Coherence

作　　者：唐千 赵云涛 Tang Qian;Zhao Yuntao(College of Information Science and Technology,Wuhan University of Science and Technology,Wuhan,Hubei 430081,China)

机构地区：[1]武汉科技大学信息科学与工程学院,湖北武汉430081

出　　处：《应用激光》2022年第5期6-12,共7页Applied Laser

摘　　要：针对目前焊缝外观检测实时性差、精度低等问题,提出一种基于光学低相干的焊缝外观特征检测方法。利用光学低相干测量原理获取焊缝外观的三维坐标信息,并利用滤波算法提取出焊缝三维轮廓;基于焊缝轮廓线的特征,提出采用DBGBCA算法对点集进行分类,以确定拟合区间;利用RANSAC算法进行直线拟合后,精确调整多项式拟合区间和拟合阶数进行曲线拟合;基于直线拟合和曲线拟合确定特征点,得到焊缝外观参数。试验结果表明,所提方法可使检测结果精确到0.004 mm,满足工业生产要求。Aiming at the low precision of welding seam appearance inspection,a welding seam appearance feature detection method based on optical low coherence was proposed.The three-dimensional coordinate information of the appearance of the weld was obtained by optical low coherence measurement principle,and the three-dimensional contour of the weld was extracted by filtering algorithm.Based on the characteristics of weld contour,DBGBCA algorithm was proposed to classify the point set to determine the fitting interval.After using RANSAC algorithm for linear fitting,the fitting interval and fitting order of polynomial are accurately adjustedfor curve fitting.Based on linear fitting and curve fitting,the characteristic points were determined,and the appearance parameters of the weld were obtained.Experimental results show that the accuracy of the proposed method can be up to 0.004mm,which meets the requirements of industrial production.

关 键 词：焊缝外观检测 光学低相干 RANSAC算法 多项式拟合 

分 类 号：TG409[金属学及工艺—焊接]