摘要
在激光跟踪干涉三维坐标测量系统中,系统的标定精度直接影响着系统最终测量精度。由于自标定方法的标定精度不高,为了提高系统标定精度,并给出系统的绝对零位值,提出了一种直线法标定思想,利用一个普通的激光干涉仪,测量出目标点沿直线运动的位移量,然后计算出坐标系统的基点坐标和绝对零位值。考虑到基点和目标点的位置布局对系统标定精度的影响,分析并确定了一种优化布局方案,并对其进行仿真。仿真结果表明,目标点对称分布的布局所标定出来的基点坐标和绝对零位值精度较高。
In the laser tracking 3D coordinate measuring system, the self--calibration should be made before measurement that would take effect mostly on the result. But the precision of the self-- calibration is not high. So, in order to enhance the calibration precision, especially give the absolute zero value of the system, a new method of calibrating the absolute zero point coordinates was proposed herein. First, a ordinary laser interferometer was employed to measure the displacement of the object mirror moved along the line, then the base coordinate and absolute zero value of this reference frame can be obtained. Considering the position distribution of base point and target point influence on the calibration precision of this system, an optimization distributions of the base point and the target points were analyzed and confirmed. After the simulation, the result shows that when the target points are distributed symmetrically relative to the base point, the measuring precision of the base point coordinates is much higher.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2008年第9期1051-1054,共4页
China Mechanical Engineering
关键词
激光跟踪
三维坐标
基点
布局
绝对零位
laser tracking
3D coordinate
base point
distribution
absolute zero point
