Branch cutting algorithm for unwrapping photoelastic phase map with isotropic point

Zhang, Yao Ting; Huang, Min Jui; Liang, Hua Rong; Lao, Fu You; Wedowski, Raphael; Atkinson, Gary; Smith, Melvyn; Smith, Lyndon

Abstract

A branch cutting algorithm is proposed to solve the wrapped isoclinic causing isochromatic discontinuity and thus to decouple the isoclinicisochromatic interaction of photoelastic phase maps. Rather than pixel by pixel, the branch-cutting isoclinic wrapped map is then restored by a modified regional approach and is proved to be more time-effective and less effort needed than the authors earlier algorithm. The decoupled isochromatic data can be handled easily afterward. Two type of simulated samples (i.e., specimens with and without isotropic points) are used to detail why and how isoclinic and isochromatic are interactive with each other and the decoupling method of the present study. Experimental works prove the effectiveness, robustness and simplicity of the newly developed algorithm. © 2011 Elsevier Ltd. All rights reserved.

• Journal Article Type: Article
• Publication Date: May 1, 2012
• Journal: Optics and Lasers in Engineering
• Print ISSN: 0143-8166
• Publisher: Elsevier
• Peer Reviewed: Not Peer Reviewed
• Volume: 50
• Issue: 5
• Pages: 619-631
• DOI: https://doi.org/10.1016/j.optlaseng.2011.10.013
• Keywords: specular freeformsurfaces, dynamic inspection, defect detection, multi-scale lineextraction, algorithm
• Public URL: https://uwe-repository.worktribe.com/output/947963
• Publisher URL: http://dx.doi.org/10.1016/j.optlaseng.2011.10.013