利用双激光器标定激光测头的光平面  

Calibrating Laser Plane of Scanning Probe with Two Lasers

作　　者：周爱国[1] 葛卫梁 陆敏恂[1] 吕刚[2] 周飞[1] 

机构地区：[1]同济大学机械与能源工程学院,上海201804 [2]海克斯康测量技术(青岛)有限公司,山东青岛266101

出　　处：《光电工程》2015年第3期44-50,共7页Opto-Electronic Engineering

摘　　要：提出了一种可以在现场对激光扫描测头进行光平面标定的方法。依据摄像机标定的模型,建立了光平面的数学模型,设计了用两条不平行的激光光条交替出现在标定棋盘上的方法,用来获取更加精确的特征点。在摄像机视场范围内,多次变换棋盘标靶位置,得到更多的特征点。坐标变换后对这些特征点进行平面拟合,得到激光平面在摄像机坐标系下的方程。试验结果表明:光平面标定的平均误差为0.028 mm。在三坐标测量机上验证其测距精度,结果表明激光扫描测头测距的最大误差为0.031 mm,说明本文方法具有较高的标定精度,且适合现场标定。A field calibration for laser scanning probe is put forward. Based on the model of camera calibration, the mathematical model of the laser plane is built. In order to get the more accuracy feature points, a new method using two alternate laser stripes which are not parallel to project on the chessboard is designed. The target is put in several different positions within the field of the camera vision aiming to get more feature points. All these feature points are fitted to an ideal plane after coordinate transformation. And the equation of the laser plane is obtained in camera coordinate. Experimental results indicate that the mean calibration error is less than 0.028mm. Using CMM to test the distance precision of the laser plane, the results show that the max distance error is 0.031mm. Experimental results indicate that the calibration technique has high accuracy and this method is suitable for field calibration.

关 键 词：激光扫描测头 光平面 不平行激光 棋盘靶标 三坐标测量机 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TP212[自动化与计算机技术—计算机科学与技术]