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Wavelet analysis of speckle patterns with a temporal carrier

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Wavelet analysis of speckle patterns with a temporal carrier

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Title: Wavelet analysis of speckle patterns with a temporal carrier
Author: Fu, Yu; Tay, Cho Jui; Quan, Chenggen; Miao, Hong
Copyright year: 2005
Abstract: A novel temporal phase-analysis technique that is based on wavelet analysis and a temporal carrier is presented. To measure displacement on a vibrating object by using electronic speckle pattern interferometry, one captures a series of speckle patterns, using a high-speed CCD camera. To avoid ambiguity in phase estimation, a temporal carrier is generated by a piezoelectric transducer stage in the reference beam of the interferometer. The intensity variation of each pixel on recorded images is then analyzed along the time axis by a robust mathematical tool, i.e., a complex Morlet wavelet transform. After the temporal carrier is removed, the absolute displacement of a vibrating object is obtained without the need for temporal or spatial phase unwrapping. The results obtained by a wavelet transform are compared with those from a temporal Fourier transform.
Subject: DRNTU::Science::Physics::Optics and light.
Type: Journal Article
Series/ Journal Title: Applied Optics
Research Centre: Temasek Laboratories
Rights: This paper was published in [Applied Optics] 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/ao/abstract.cfm?uri=ao-44-6-959]. 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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