Journal
OPTICS AND LASERS IN ENGINEERING
Volume 45, Issue 1, Pages 57-63Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2006.04.012
Keywords
digital speckle correlation method; iterative; smoothing; displacement and strain fields
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In this paper, an improved method for measuring displacement in digital speckle correlation technology, which is based on an iterative and spatial-gradient algorithm, is developed. After obtaining full-field displacement, both finite element method and 2D generalized cross-validation (GCV) algorithm are adopted for smoothing the displacement field, and then the strain field can be obtained from the smoothed displacement field. The method is estimated by simulated speckle patterns and three-point bending experiment. All the results show the improved method can obtain a reasonable estimation of displacement and strain fields in digital speckle correlation method. (C) 2006 Elsevier Ltd. All rights reserved.
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