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

Balakrishnan Deepan; Chenggen Quan; Cho Jui Tay

doi:10.1117/1.OE.55.12.121707

22 June 2016 Determination of slope, curvature, and twist from a single shearography fringe pattern using derivative-based regularized phase tracker

Balakrishnan Deepan, Chenggen Quan, Cho Jui Tay

Author Affiliations +

Optical Engineering, Vol. 55, Issue 12, 121707 (June 2016). https://doi.org/10.1117/1.OE.55.12.121707

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.

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Balakrishnan Deepan, Chenggen Quan, and Cho Jui Tay "Determination of slope, curvature, and twist from a single shearography fringe pattern using derivative-based regularized phase tracker," Optical Engineering 55(12), 121707 (22 June 2016). https://doi.org/10.1117/1.OE.55.12.121707

Published: 22 June 2016

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