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Title: Direct measurement of curvature and twist of plates using digital shearography
Authors: Chau, F.S. 
Zhou, J.
Keywords: Curvature
Digital shearography
Phase shifting
Second-order derivatives
Issue Date: Apr-2003
Source: Chau, F.S.,Zhou, J. (2003-04). Direct measurement of curvature and twist of plates using digital shearography. Optics and Lasers in Engineering 39 (4) : 431-440. ScholarBank@NUS Repository.
Abstract: A method of determining the second-order derivatives of displacement using digital shearing speckle interferometry is presented in this paper. A phase-shifting technique is incorporated and demonstrated to yield good quality fringe patterns that depict either the second-order derivative separately or a combination of first- and second-order derivatives. The optical set-up of this method is similar to that of conventional phase-shifting shearography, thus enjoying a simple and practical configuration. Qualitative comparison shows acceptable agreement of the generated fringe patterns with theoretical results. © 2002 Elsevier Science Ltd. All rights reserved.
Source Title: Optics and Lasers in Engineering
ISSN: 01438166
DOI: 10.1016/S0143-8166(02)00025-8
Appears in Collections:Staff Publications

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