坡口及焊缝表面三维轮廓的激光视觉测量  

Laser vision measurement for 3D surface outline of groove and weld

作　　者：张鹏贤[1,2] 张国强[1,2] 韦志成 王文艳 

机构地区：[1]兰州理工大学有色金属先进加工与再利用省部共建国家重点试验室,兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点试验室,兰州730050 [3]东北林业大学理学院数学系,哈尔滨150040

出　　处：《焊接学报》2017年第12期85-89,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50775105);国家自然科学基金--青年科学基金项目(11401086)

摘　　要：提出了一种坡口及焊缝表面三维轮廓激光视觉测量方法.投射在坡口及焊缝轮廓表面的激光条纹,其视觉图像可作为表征轮廓特征的信息源,系统采集连续扫描的激光条纹视觉图像,得到条纹上各离散点的三维坐标.同时采用一种搜索拟合插值算法,获取条纹间各离散点的三维坐标,在系统的三维坐标系中,采用离散点直连成网格的曲面重构方法,实现了一段坡口及焊缝表面三维轮廓的实时测量.结果表明,在重构的三维表面轮廓任意截面上,获取的坡口宽度和深度值与游标卡尺实际测量值吻合度可达97.85%以上,这种激光视觉测量方法是可行的.A new method was proposed to measure 3 D outline of groove and weld surface by laser vision. When the laser stripe was scanning continuously on the surface of groove and weld,the image of stripe could reflect the outline feature and be taken as information source. The measurement system acquired a series of laser stripe images and all the discrete points of 3 D coordinates. At the same time,3 D discrete coordinates between laser stripes were obtained through an interpolation algorithm of searching and fitting. Then a surface reconstruction method where discrete points were linked to grids was used to obtain the3 D outline of groove and weld. The validation results showed the matching degree of groove width and depth from three-dimensional surface outline was up to 97. 85% in each section,which proved that this laser vision measurement was feasible.

关 键 词：视觉测量 激光条纹 坐标化 三维轮廓 

分 类 号：TG441.7[金属学及工艺—焊接]