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Title: Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis
Authors: Tay, C.J. 
Quan, C. 
Fu, Y. 
Huang, Y.
Issue Date: 20-Jul-2004
Citation: Tay, C.J., Quan, C., Fu, Y., Huang, Y. (2004-07-20). Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis. Applied Optics 43 (21) : 4164-4171. ScholarBank@NUS Repository.
Abstract: A temporal wavelet analysis method is proposed for velocity, displacement, and three-dimensional surface-profile measurement of a continuously deforming object by use of the shadow moiré technique. A grating is placed close to a deforming object, and its shadow is observed through the grating. The moiré fringe patterns, generated by the interference of the grating lines and their shadows, are captured by a high-speed COD camera with a telecentric gauging lens. Instantaneous frequency of gray-value variation is evaluated point by point with the continuous wavelet transform. From the instantaneous frequency of each point on the object, the velocity, displacement, and high-quality surface profile at different instants can be retrieved. In this application, two specimens are tested to demonstrate the validity of the proposed method: One is a small coin with a rigid body motion, and the other is a simply supported beam subjected to a central point load. The results are compared with those obtained from temporal Fourier-transform and mechanical stylus methods. © 2004 Optical Society of America.
Source Title: Applied Optics
ISSN: 00036935
DOI: 10.1364/AO.43.004164
Appears in Collections:Staff Publications

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