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Optical Engineering

Determination of slope, curvature, and twist from a single shearography fringe pattern using derivative-based regularized phase tracker
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Paper Abstract

A fringe analysis algorithm for determination of slope, curvature, and twist from a single fringe pattern in digital speckle-shearing interferometry is proposed. A method for estimation of biased curvature and twist maps from fringe orientation and fringe density maps is employed. The curvature and twist maps obtained are further processed by B-spline interpolation to achieve high quality curvature and twist maps. A derivative-based regularized phase tracker (RPT) utilizes these predetermined curvature and twist maps for determination of a slope map from a single shearography fringe pattern. The proposed model requires less computational time and it overcomes the limitations of the RPT model. The method is validated with an experimental fringe pattern. The results show that this method is robust against speckle noise and it is able to retrieve accurate slope, curvature, and twist maps from a single shearography fringe pattern.

Paper Details

Date Published: 22 June 2016
PDF: 6 pages
Opt. Eng. 55(12) 121707 doi: 10.1117/1.OE.55.12.121707
Published in: Optical Engineering Volume 55, Issue 12
Show Author Affiliations
Balakrishnan Deepan, National Univ. of Singapore (Singapore)
Chenggen Quan, National Univ. of Singapore (Singapore)
Cho Jui Tay, National Univ. of Singapore (Singapore)

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