A projected-fringe fiber-based moiré interferometer is proposed to measure the local amplitude vibration of a diffuse surface. The technique is based on an optical fiber interferometer which projects interference fringes on the object surface. The visibility of these carrier fringes is modulated by a function of local amplitude vibration. Full-field quantitative analysis is performed by analyzing the fringe pattern with a 2-D Fourier transform method. Theoretical details, and experimental results are presented.
SCHIRRIPA SPAGNOLO, G., Ambrosini, D., Paoletti, D. (1998). Measurement of vibration amplitude by an optical fiber-based moiré interferometer. OPTICS AND LASERS IN ENGINEERING, 30, 213-223 [10.1016/S0143-8166(98)00017-7].