Acta Optica Sinica, Volume. 31, Issue 4, 412005(2011)
Low-Frequency Vibration Measurement Based on Spatiotemporal Analysis of Shadow Moiré
A method for vibration measurement of an object based on spatiotemporal analysis of shadow moiré fringes is discussed. In this method, a sinusoidal grating is closed to a vibrating object. The moiré fringes 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 sequences is processed by the 3D Fourier transform simultaneously rather than separately. A 3D space-time phase distribution can be obtained from the filtered spatiotemporal spectra and 3D inverse Fourier transform. From the phase values, the surface profile and displacement of the object at different time can be retrieved. The measurement experiment of a vibrating cantilever beam demonstrated the validity of this method. The results show that shadow moiré with spatiotemporal analysis can be applied to dynamic measurement.
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Shi Hongjian, Zhu Feipeng, He Xiaoyuan. Low-Frequency Vibration Measurement Based on Spatiotemporal Analysis of Shadow Moiré[J]. Acta Optica Sinica, 2011, 31(4): 412005
Category: Instrumentation, Measurement and Metrology
Received: Jul. 26, 2010
Accepted: --
Published Online: Mar. 31, 2011
The Author Email: Hongjian Shi (shj_seu@yahoo.com.cn)