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|Title:||Determination of curvature and twist by digital shearography and wavelet transforms||Authors:||Tay, Cho Jui
|Keywords:||DRNTU::Science::Physics::Optics and light||Issue Date:||2005||Source:||Tay. C. J., & Fu, Y. (2005). Determination of curvature and twist by digital shearography and wavelet transform. Optics Letters, 30(21), 2873-2875.||Series/Report no.:||Optics Letters||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.||URI:||https://hdl.handle.net/10356/92036
|ISSN:||0146-9592||DOI:||http://dx.doi.org/10.1364/OL.30.002873||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.||metadata.item.grantfulltext:||open||metadata.item.fulltext:||With Fulltext|
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