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Separation of isoclinics and isochromatics from photoelastic data with a regularized phase-tracking technique

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2000-06-10
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The Optical Society of America
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We present the application of a regularization algorithm to the processing of photoelastic fringe patterns. The method used is a modified regularized phase-tracking (RPT) algorithm applied to phase-shifted images. In particular, we present an algorithm for isoclinic-isochromatic separation that uses only five images. In the case of isoclinics the method can deal with problems associated with modulation of isochromatics and with isotropic points by means of a modified cost functional. With respect to the isochromatics the problems associated with regions of high fringe density are solved in a robust way by the unmodified RPT algorithm by use of the modulation information. The performance of the method is discussed, and experimental results are presented.
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© 2000 Optical Society of America. During realization of this study J. A. Quiroga was supported in part by a post-doctoral grant from the Universidad Complutense de Madrid and by the Becas Internacionales Flores-Valles program, Spain. We acknowledge the support of the Centro de Investigaciones en Óptica (CIO), León, México.
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