A Laser Tracking 3D Coordinate Measuring System and Design of its Tracking Mechanism

摘要

A four-beam laser tracking 3D coordinate measuring system based on multi-lateration method has been developed for measuring coordinates of the object moving in space. The system adopts redundant design and uses four laser tracking interferometers which are simple in construction and convenient in adjustment. It has some special features in many aspects. Since the performance of tracking mechanism has significant influence on system performance, an independent tracking mechanism with single mirror has been developed. In this paper, the working principle and main functional features of the four-beam laser tracking 3D coordinate measuring system, as well as the working principle, construction and error sources of the independent tracking mechanism are introduced. Methods and results of related experiments are also dissertated in the paper. The experimental results show that the tracking speed of the laser tracking interferometer can reach at least 0.4m/s, the standard deviation of the laser tracking interferometer is 0.49μm, and the measuring error of the system for measuring 3D coordinates is 0.062mm.