DIGITAL SPECKLE INTERFEROMETRY - SOME DEVELOPMENTS AND APPLICATIONS FOR VIBRATION MEASUREMENT IN THE AUTOMOTIVE INDUSTRY

This paper presents an overview of some recent progress in digital spe ckle interferometry and its application for vibration measurement in t he automotive industry. It describes three methods to generate raw vib ration fringe patterns with better quality; provides speckle averaging , phase shifting, and phase reconstruction iteration procedures to pro duce a high-quality and noise-free fringe pattern; illustrates one sin gle setup for measuring both vibration deformation and geometric shape of an object; and demonstrates how powerful this tool is for whole ve hicle modal survey, interactive design optimization, CAE model correla tion, and nondestructive testing. Finally, areas for further developme nt are suggested. (C) 1998 Society of Photo-Optical Instrumentation En gineers. [S0091-3286(98)00905-2].