高精密转台标定方法研究

针对特定情况下高精密大型转台定位精度的标定问题,提出了一种采用激光跟踪仪标定的方法,首先分析影响标定方法精度的因素,通过优化测量参数及采样策略,建立基于激光跟踪仪的最优标定系统,拟合激光跟踪仪测得点所在的三维平面,通过坐标变换将测量点转换到二维平面上,拟合转换后的数据得到圆心坐标,最后计算相邻测量点与圆心连线的夹角,与理论值进行比较,从而确定转台的定位精度。实验表明,标定系统的精度满足要求。该标定方法简单可靠,提高了高精密大型转台的标定效率。

Calibration method research for high precision turntable

A calibration method using laser tracker is proposed to calibrate the positioning accuracy of high precision turntable.First,the factors affecting the calibration precision were analyzed,and then the optimized calibration system was built based on the optimization of measurement parameters and sampling strategy.The measuring points by Laser tracker,which had been fitted into 3-D plane,were transformed from 3-D plane to 2-D plane,so that the center of the turntable was obtained through circle fitting.Finally,the angles of adjacent lines from measuring points to center were calculated and compared with theoretical value to identify the positioning accuracy of the turntable.Experimental results demonstrated that the calibration system improved the calibration efficiency of high precision turntable with its simplicity and reliability in calibration.