Quiroga Mellado, Juan AntonioGonzález Cano, Agustín2023-06-202023-06-201997-11-100003-693510.1364/AO.36.008397https://hdl.handle.net/20.500.14352/58799© 1997 Optical Society of America. We thank Hans Steinbichler of Steinbichler-Optotechnik GmbH and all the people there for their encouragement and technical assistance during the development of this study. Also, we thank Eusebio Bernabeu, director of the Optics Department of Universidad Complutense, for his help and continuous support. This research has been partly supported by a post-doctoral grant from the Ministerio de Educación y Ciencia of Spain.In recent years phase-measuring techniques have been applied to the problem of extracting information of photoelastic data. We present a new phase-measuring algorithm for extraction of the isochromatics of photoelastic fringe patterns. The algorithm permits the extraction of the isochromatic phase with almost no influence from the isoclinics, thus avoiding the usual problems of low-modulation areas associated with isoclinics. The isochromatic phase map obtained with this algorithm is well suited for a full separation of the stress components in a sample. The algorithm can be used with any commercial diffuse-light circular polariscope.engjournal articlehttp://dx.doi.org/10.1364/AO.36.008397http://www.opticsinfobase.orgopen access535PhotoelasticityPhase-Measuring AlgorithmsIsochromaticsÓptica (Física)2209.19 Óptica Física