Please use this identifier to cite or link to this item:
Title: Wavelet analysis of digital shearing speckle patterns with a temporal carrier
Authors: Quan, Chenggen
Fu, Yu
Miao, Hong
Keywords: DRNTU::Science::Physics::Optics and light
Issue Date: 2006
Source: Quan, C., Yu, F., & Miao, H. (2006). Wavelet analysis of digital shearing speckle patterns with a temporal carrier. Optics Communications, 260(1), 97-104.
Series/Report no.: Optics communications
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.
ISSN: 0030-4018
Rights: This is the author created version of a work that has been peer reviewed and accepted for publication by Optics Communications, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI:].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:TL Journal Articles

Files in This Item:
File Description SizeFormat 
Wavelet analysis of digital shearing speckle patterns with a temporal carrier.pdf445.7 kBAdobe PDFThumbnail

Google ScholarTM



Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.