激光光斑中心高精度定位补偿算法研究  

High Precision Positioning and Compensation Algorithm for Laser Spot Center

作　　者：蒋佳雯 康杰虎 吴斌[1] Jiang Jiawen;Kang Jiehu;Wu Bin(State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《激光与光电子学进展》2021年第14期354-359,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61771336);天津市自然科学基金(18JCZDJC38600)。

摘　　要：关节型激光传感器是一种新型的基于非正交轴系架构的非接触式三维坐标测量仪器,测量时需保证系统左右单元激光束精密交会。因此,实现高精度激光光斑中心定位是保证其测量精度的前提和基础。光斑中心定位误差分为随机误差和系统误差两部分。对于随机误差,采用边缘阈值法进行消除;对于系统误差,提出一种基于非线性最小二乘拟合的补偿方法。基于直线度误差评定方法,对激光光斑中心定位和补偿方法的效果进行对比分析。实验结果表明,所提方法能将质心法的定位精度提高至0.12 pixel,明显优于现有其他方法,满足关节型激光传感器的高精度测量要求。Articulated laser sensor is a new-fashioned non-contact three-dimensional coordinate measuring instrument based on non-orthogonal axis architecture,which requires the intersection accuracy of laser beams from the left and right units.Therefore,the acquisition of high precision laser spot center is the premise and basis for ensuring measurement accuracy.The spot center-positioning error can be divided into random and system errors.For random error,the edge threshold method is used to eliminate them.For system error,a compensation method based on nonlinear least square fitting is proposed.Based on the straightness error evaluation method,the results of the above positioning and compensation method of laser spot center are compared and analyzed.The results show that the positioning accuracy of the centroid method can be improved to 0.12 pixel using the proposed method.Additionally,the proposed method performs better than other existing methods and satisfies the high precision measurement requirements of articulated laser sensor.

关 键 词：测量 数字图像处理 系统误差 质心法 误差补偿 

分 类 号：TN249[电子电信—物理电子学]