Vibration measurement by spatiotemporal analysis of shadow moiré fringes

Hongjian Shi; Feipeng Zhu; Xiaoyuan He

doi:10.1117/12.852699

14 April 2010 Vibration measurement by spatiotemporal analysis of shadow moiré fringes

Hongjian Shi, Feipeng Zhu, Xiaoyuan He

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 75222D (2010) https://doi.org/10.1117/12.852699
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

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.

Citation Download Citation

Hongjian Shi, Feipeng Zhu, and Xiaoyuan He "Vibration measurement by spatiotemporal analysis of shadow moiré fringes", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75222D (14 April 2010); https://doi.org/10.1117/12.852699

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