Study of CAD-based laser guiding measurement technology

摘要

The laser Guiding Measurement Robot (LGMR) technology is based on the measurement method "laser beam moving, Spherical Mounted Retro-reflector (SMR) tracking", which uses CAD model to control the position and attitude signals of measuring laser beam that guides the robot carrying SMR to the required position to complete the measurement of the objects together with a laser tracker. It is a key technology to be studied deeply how the CAD model is converted into the signals, which can make laser beam scan and guide the device with SMR to move to the required position. This paper describes the research work to the development of an optical guidance system for CMM with SMR by use of the CAD model of a completed object. The working principle and structure of LGMR are presented firstly. Then the method converting the CAD model to signals is studied successfully. Next, the guidance system employs the signals to make laser beam point to the required position and guide the CMM with SMR to the position at the same time. Finally, the experiment is carried out to prove the correctness of the methodology. The results show the maximum error of the measured curve is 0.12mm.