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Updated: Sep 30, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
Published on: May 23, 2017
Influence of displacement and its first- and second-order derivative components on curvature fringe formations in
Kaifu Wang1, Anh Kiet Tieu, Enbang Li
1Department of Mechanical Engineering, Faculty of Engineering, University of Wollongong, New South Wales, Australia. kw17@uow.edu.au
Abstract:
The influence of displacement and its first- and second-order derivative components on curvature fringe formations in speckle shearography is discussed. The results show that (a) all the displacement components have no direct influence on curvature fringe formations; (b) only the first-order derivative component along the centerline of three apertures has an influence on curvature fringe formations, whereas all the other first-order components have no influence; and (c) all the second-order derivative components have no influence on curvature fringe formations. Results from theory and experiments are in good agreement.
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