We analyze the sensitivity of a video-based moiré technique used to measure vibrations. By use of modulated projected fringes, full-field distributions are mapped for both the vibration amplitude and the vibration phase. We also show methods for visual interpretation of the vibration fringe pattern, and we describe phase-stepping algorithms for full-field calculations of the distributions by use of digital image-processing equipment. Implementation of these methods makes it possible to measure vibration amplitude and phase over a large range of amplitudes, from < 1 μm to several millimeters. We show that the method bridges the traditional gap between holographic interferometry and moiré methods.
© 1994 Optical Society of America
Original Manuscript: June 12, 1992
Revised Manuscript: May 21, 1993
Published: February 10, 1994
Geir Ove Rosvold, "Video-based vibration analysis using projected fringes," Appl. Opt. 33, 775-786 (1994)