基于双线结构光的圆筒形工件直径测量研究  

Research on diameter measurement of cylinder parts based on double line structured light

作　　者：米星如 金永[1] 郭鑫 王鉴[1] MI Xingru;JIN Yong;GUO Xin;WANG Jian(School of Information and Communication Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学信息与通信工程学院,太原030051

出　　处：《激光杂志》2025年第2期101-105,共5页Laser Journal

基　　金：国家自然科学基金(No.62204232);山西省自然科学基金(No.20210302124189)。

摘　　要：针对圆筒形工件直径测量系统复杂且误差较大的问题,提出一种基于双线结构光视觉系统的直径测量方法。该方法将两条非交叉激光线照射在工件表面,有效利用激光条纹的曲率信息,准确提取出亚像素中心点,并设置法向偏差阈值剔除异常点。通过双平面校准,推导出中心轴垂面的方程,用于纠正激光线非垂直投射的误差。最后在垂面上对有效点进行圆拟合,并取多角度拟合数据的平均值作为测量结果。实验结果表明,本方法与局部激光扫描方法相比较,测量精度提升了大约30μm,且200 mm直径内的圆筒形工件直径测量平均误差在17μm以内,提高了检测精度且放宽了测量系统要求。Aiming at the problem that the diameter measurement system of cylinder parts is complicated and the error is large,a diameter measurement method based on double line structured light vision system is proposed in this paper.In this method,two non-cross laser lines are irradiated on the surface of the workpiece,the curvature informa-tion of the laser fringe is effectively used to extract the subpixel center point accurately,and the normal deviation threshold is set to eliminate the abnormal point.Through biplane calibration,the equation of the vertical plane of the center axis is derived to correct the error of non-vertical irradiation of the laser line.Finally,the effective points are fitted on the vertical plane,and the average value of the multi-angle fitting data is taken as the diameter measurement value.The experimental results show that compared with the local laser scanning method,the measurement accuracy of the proposed method is improved by about 30μm,and the average measurement error of the diameter of the cylindrical workpiece within 200mm diameter is less than 17μm,which improves the detection accuracy and loosens the measure-ment system requirements.

关 键 词：双线结构光 视觉检测 直径测量 激光中心线提取 

分 类 号：TN249[电子电信—物理电子学]