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Isoclinic and isochromatic parameters in photoelastic analysis are formulated by  arc tangent function of several phase shifting frames but for isochromatic  calculation it is, in addition, in terms of isoclinic data also. Thus, any  isoclinic phase ambiguity would also result in the phase inconsistencies of  isochromatic calculation and cause unwrapping problems and difficulties. Many  methods had been proposed to treat these kinds of isochromatic fringes but lots  of treatments were needed for the correct retrieval. In this work, the isoclinic  ambiguity problem is investigated and solved directly by a novel regional phase  unwrapping technique. Once the isoclinic phase ambiguity problems are solved, a  correct isoclinic result can be obtained. Then, substituting this result into  the isochromatic formation yields an ambiguity free isochromatic phase map,  which can be easily restored by any phase unwrapping algorithm. A stress frozen  sample - circular ring under diametric compression verifies its effectiveness.  Usually happened is that this kind of sample is with ambiguous isoclinic data  which would cause phase ambiguities of the isochromatic formulation if not  treated well first

Isoclinic Ambiguity Unwrapping of Circular Ring under Diametric Compression