Application of iteration and finite element smoothing technique for displacement and strain measurement of digital speckle correlation

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...

Full description

Saved in:
Bibliographic Details
Published in:Optics and lasers in engineering 2007, Vol.45 (1), p.57-63
Main Authors: Meng, L.B., Jin, G.C., Yao, X.F.
Format: Article
Language:English
Subjects:
Digital speckle correlation method
Displacement and strain fields
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Imaging and optical processing
Iterative
Measurements common to several branches of physics and astronomy
Metrology, measurements and laboratory procedures
Optics
Physics
Smoothing
Spatial dimensions (e.g.: position, lengths, volume, angles, displacements, including nanometer-scale displacements)
Speckle and moire patterns
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0143-8166
1873-0302
DOI:10.1016/j.optlaseng.2006.04.012