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Title: Determination of curvature and twist by digital shearography and wavelet transforms
Authors: Tay, C.J. 
Fu, Y. 
Issue Date: 1-Nov-2005
Citation: Tay, C.J., Fu, Y. (2005-11-01). Determination of curvature and twist by digital shearography and wavelet transforms. Optics Letters 30 (21) : 2873-2875. ScholarBank@NUS Repository.
Abstract: A new technique based on digital shearography for determining the transient curvature and twist of a continuously deforming object from a series of speckle patterns is presented. The intensity variation of each pixel is analyzed along the time axis by using a complex Morlet wavelet transform. The absolute sign of the phase variation is determined by introduction of a temporal carrier when the speckle patterns are captured by a high-speed camera. A high-quality spatial distribution of the deflection derivative is extracted at any instant without the need for temporal or spatial phase unwrapping. The continuous Haar wavelet transform is subsequently processed as a differentiation operator to reconstruct the instantaneous curvature and twist of a continuously deforming object. © 2005 Optical Society of America.
Source Title: Optics Letters
ISSN: 01469592
DOI: 10.1364/OL.30.002873
Appears in Collections:Staff Publications

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