Evaluation of line-wise and semi region-wise phase unwrapping for isoclinic parameter in digital photoelasticity

P. Pinit

doi:10.1117/12.839211

24 August 2009 Evaluation of line-wise and semi region-wise phase unwrapping for isoclinic parameter in digital photoelasticity

P. Pinit

Author Affiliations +

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73752B (2009) https://doi.org/10.1117/12.839211
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

Isoclinic parameter is one of the important parameters in (digital) photoelasticity. This paper presents a comparative study of two phase unwrapping methods for the parameter. The two phase unwrapping methods are a line-wise method and a semi-region-wise method. The paper focuses on the way that how the methods handle the wrapped isoclinic map(s), which is used to start unwrapping, having the edge-cut line and non-edge-cut line in the final or unwrapped isoclinic map. The edge-cut line and non-edge-cut line are the line of isoclinic jumps that link the points of discontinuity (isotropic points) with some points locating at the boundaries and inside the isoclinic map, respectively. For the evaluation, three models, the circular disk and ring under diametral compression and circular disk under three radial loads, were used. The comparative results show that the semi region-wise method is superior to the line wise method.

Citation Download Citation

P. Pinit "Evaluation of line-wise and semi region-wise phase unwrapping for isoclinic parameter in digital photoelasticity", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73752B (24 August 2009); https://doi.org/10.1117/12.839211

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KEYWORDS

Photoelasticity

Digital photography

Phase shifts

Inspection

Current controlled current source

Experimental mechanics

Mechanics

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