外差式多频相移技术的三维光学点云测量研究

Study on 3D optical points dense cloud measuring system based on heterodyne multiple frequency phase shift technology

随着中国制造业的快速发展,产品工件大量采用复杂曲面。对于大型复杂曲面工件,如汽车大型覆盖件、水轮机叶轮、大型抛物面天线等,现有的测量设备很难实现全尺寸检测和反求设计。本文针对大型复杂曲面工件的三维全尺寸快速检测和反求需求,分析了三维光学测量的原理,分析了格雷码加相移技术与外差式多频相移技术的优缺点,采用目前最新的外差式多频相移技术,研制了XJTUOM型三维光学密集点云测量系统,对大型工件的测量试验表明,该系统便捷实用。

With the rapid development of manufacture industry in China, more and more complicated curves are applied in the mechanical productions. The conventional 3D measuring devices, such as CMM, only can he applied to measure the small workpiece precisely, but as to the large worpiece with complicated curves, such as large automobile panel, large injection parts, welded automobile rind, turbine blade and large parabolic antenna and aero model and so on, the traditional apparatus are incapable to realize the whole size measurement. In view of the need of 3D rapid measuring and reverse engineering in large complicated-surfaced parts of vehicle, the principle of 3D optical measuring system was analyzed. The advantages and disadvantages of Gary code phase shift technology and heterodyne multiple frequency phase shift technology were compared. Based on heterodyne multiple frequency phase shift technology, the XJTUOM 3D optical dense points cloud measuring system was developed, and the convenience and practice of this system was also verified by amount of measuring tests on the large parts of vehicle.