Continuous phase retrieval of isoclinic parameter in digital photoelasticity
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Publication Details
Author list: Pinit P.
Publisher: Society of Photo-optical Instrumentation Engineers
Publication year: 2009
Volume number: 7375
ISSN: 0277-786X
eISSN: 1996-756X
Languages: English-Great Britain (EN-GB)
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. © 2009 SPIE.
Keywords
Isoclinic phase map
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