MEASUREMENT OF VIBRATION AMPLITUDE BY AN OPTICAL FIBER-BASED MOIRE INTERFEROMETER

A projected-fringe fiber-based moire interferometer is proposed to mea sure the local amplitude vibration of a diffuse surface. The technique is based on an optical fiber interferometer which projects interferen ce fringes on the object surface. The visibility of these carrier frin ges is modulated by a function of local amplitude vibration. Full-fiel d quantitative analysis is performed by analyzing the fringe pattern w ith a 2-D Fourier transform method. Theoretical details, and experimen tal results are presented. (C) 1998 Elsevier Science Ltd. All rights r eserved.