Development of Shape Measurement System Using Mirrors for Metallic Objects

Abstract

3-D shape measurement systems by contactless method are required in the quality inspections of metal molds and electronic parts in industrial fields. A grating projection method with phase analysis has advantages of high precision and high speed. Halation often occurs on a part of a metallic object. When the direction of the camera or the direction of the projector is changed, the halation area is changed. The results obtained by the several cameras are the same coordination system because the same reference planes are used for the calibration in a whole-space tabulation method (WSTM). Therefore, it is easily to merge the results obtained by the several cameras. In this paper, we develop a shape measurement system with several cameras. To reduce the number of the camera, two mirrors are used. The developed system and the experimental results to measure a metallic object are shown.