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Title: Wavelet analysis of digital shearing speckle patterns with a temporal carrier
Authors: Quan, C. 
Fu, Y. 
Miao, H. 
Keywords: Digital shearing speckle interferometry
Phase retrieval
Temporal carrier
Wavelet transform
Issue Date: 1-Apr-2006
Citation: Quan, C., Fu, Y., Miao, H. (2006-04-01). Wavelet analysis of digital shearing speckle patterns with a temporal carrier. Optics Communications 260 (1) : 97-104. ScholarBank@NUS Repository.
Abstract: Shearography is an optical technique allows direct measurement of deflection derivatives. This paper presents a novel temporal phase analysis technique based on wavelet transform when shearography is applied to measure a continuously deforming object. A series of shearing speckle patterns is captured by a high-speed camera during the deformation. To avoid the phase ambiguity problem, a temporal carrier is generated by a piezoelectrical transducer (PZT) stage in one beam of the modified Michelson interferometer. The intensity variation of each pixel on recorded images is then analyzed along time axis by a robust mathematical tool - complex Morlet wavelet transform. After the temporal carrier is removed, the absolute phase change representing the first-order derivative of the continuous deformation is obtained without the need of temporal or spatial phase unwrapping process. The results obtained by wavelet transform are compared with those from temporal Fourier transform. © 2005 Elsevier B.V. All rights reserved.
Source Title: Optics Communications
ISSN: 00304018
DOI: 10.1016/j.optcom.2005.10.023
Appears in Collections:Staff Publications

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