Planar Scanning Plane Comprehensive Error Data Measurement Analysis

Abstract

In this paper,the positioning data for large planar scanning plane were measured with laser tracker, converted the coordinate by spatial error between scanning plane and tracker , and analyzed the converted error data. For the subsequent use of the least squares method error compensation provided. Identification of Measurement Error Comprehensive error measurement data identification method is through a variety of measurements, scanned plane scanning plane position measurement position error parameter. After identification of the mathematical model of its integrated error parameters measured, indirectly discrete values scanning plane of the error parameter. Laser Tracker is the most common stage of a measurement of space target tracking and real-time measurement of three-dimensional coordinates of the target space. By coordinate transformation can be determined from the deviation and the angle deviation anchor points. Simultaneous measurement of high precision, easy operation, broken light Renewed good. Measuring principle is shown below: Fig1 Test system schematic The laser beam passes through the mirror is mounted on a target object to be measured (scanning plane probe position) reflected laser tracker emitted by laser interference principle can achieve three-dimensional coordinate measuring three-dimensional space coordinates of any point. According to this feature, the rotational center of the laser tracker as the origin of the space coordinates, respectively, in the direction of scanning plane XYZ-axis rail is defined as the XYZ coordinate system, the center of the sphere as a target by a mirror measuring point. The coordinates of the target mirror in space as three-dimensional coordinates is ( x a , y a , z a ).As the target is moved in the scanning X, Y plane, laser tracker available three-dimensional coordinates of each mobile points. We could measure and evaluate the surface flatness data which was from scanning X, Y plane. The establishment of reference coordinate system and scanning plane coordinate system is not strictly coincide, therefore coordinate error exists between scanning plane coordinate system ' ' ' ' Z Y X O − and the reference coordinate system XYZ O − . 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering (ICMMCCE 2015) © 2015. The authors Published by Atlantis Press 770 Fig 2 According to the error model, two coordinates corresponding coordinate the following correspondence: