Special Section on Speckle-Based Metrology

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

[+] Author Affiliations
Balakrishnan Deepan, Chenggen Quan, Cho Jui Tay

National University of Singapore, Department of Mechanical Engineering, 9 Engineering Drive 1, Singapore 117576, Singapore

Opt. Eng. 55(12), 121707 (Jun 22, 2016). doi:10.1117/1.OE.55.12.121707
History: Received April 26, 2016; Accepted June 6, 2016
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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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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

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", Opt. Eng. 55(12), 121707 (Jun 22, 2016). ; http://dx.doi.org/10.1117/1.OE.55.12.121707


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