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Proceedings Paper

Vibration measurement by spatiotemporal analysis of shadow moiré fringes
Author(s): Hongjian Shi; Feipeng Zhu; Xiaoyuan He
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Paper Abstract

A 3D Fourier transform for vibration measurement of an object based on shadow moiré technique is presented. A sinusoidal grating is placed closed to a vibrating object. The moiré fringe patterns generated by the interference of grating lines and shadow lines are captured by a high-speed camera. The joint spatial and temporal information of the fringe sequence is processed by use of the 3D Fourier transform simultaneously rather than separately, then a 3D space-time phase distribution can be obtained from the filtered spatiotemporal spectra. From the phase values, the surface profile, and displacement of the object at different time can be retrieved. The experiment for measurement of a vibrating cantilever beam is used to demonstrate the validity of the technique. The results show that shadow moiré with spatiotemporal analysis can be applied to dynamic measurement.

Paper Details

Date Published: 14 April 2010
PDF: 9 pages
Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75222D (14 April 2010); doi: 10.1117/12.852699
Show Author Affiliations
Hongjian Shi, Southeast Univ. (China)
Feipeng Zhu, Southeast Univ. (China)
Xiaoyuan He, Southeast Univ. (China)

Published in SPIE Proceedings Vol. 7522:
Fourth International Conference on Experimental Mechanics
Chenggen Quan; Kemao Qian; Anand Krishna Asundi; Fook Siong Chau, Editor(s)

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