Continuous phase retrieval of isoclinic parameter in digital photoelasticity

P. Pinit

doi:10.1117/12.839208

24 August 2009 Continuous phase retrieval of isoclinic parameter in digital photoelasticity

P. Pinit

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 737528 (2009) https://doi.org/10.1117/12.839208
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

In this paper, an automated phase unwrapping algorithm for isoclinic parameter based on the phase stepping technique is presented. It provides whole-field maps of isoclinics for both σ1 and σ2 directions. The technique is based on processing four photoelastic fringe images of stressed photoelastic model acquired using a dark-field plane polariscope. The unwrapping process starts with the (largest) region selected on the basis of a threshold value and a map of isoclinics required. It works with two models (circular disk and ring under diametral compression), regardless of the presence of the isotropic points. The obtained results from the application reveal that the algorithm provides reliable experimental maps of σ1 and σ2 directions which are comparable to those maps obtained from simulated fringes.

Citation Download Citation

P. Pinit "Continuous phase retrieval of isoclinic parameter in digital photoelasticity", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 737528 (24 August 2009); https://doi.org/10.1117/12.839208

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KEYWORDS

Photoelasticity

Binary data

Digital photography

Algorithm development

Phase retrieval

Computer simulations

Phase shifting

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