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Determination of curvature and twist by digital shearography and wavelet transforms

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Determination of curvature and twist by digital shearography and wavelet transforms

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Title: Determination of curvature and twist by digital shearography and wavelet transforms
Author: Tay, Cho Jui; Fu, Yu
Copyright year: 2005
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.
Subject: DRNTU::Science::Physics::Optics and light
Type: Journal Article
Series/ Journal Title: Optics Letters
Research Centre: Temasek Laboratories
Rights: This paper was published in [Optics Letters] and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: [http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-21-2873]. Systematic or multiple reproduction or distribution to multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Version: Published version

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