A phase-measuring method is proposed for stress separation in two-dimensional interferometric photoelasticity. A Mach–Zehnder-type interferometer combined with a circular polariscope is used for the observation of isochromatics and isoclinics as well as isopachics. Phase-stepping is performed for the determination of the phase values of isochromatics and isoclinics by rotating both a quarter-wave plate and an analyser. On the other hand, the phase of the isopachics is analysed from images obtained by shifting a mirror in the interferometer. Then, the phases of isochromatics and isoclinics without ambiguity are obtained by introducing a load-stepping technique. The phases obtained by the load-stepping are also used for unwrapping the phases of isochromatics and isopachics. In the present paper, light intensity equations for the proposed optical set-up are derived using Jones calculus. Then, the effectiveness is demonstrated by applying the proposed method to a simple problem.

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