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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-shifting is performed for the determination of the phase values of isochromatics and isoclinics by rotating both of a quarter-wave plate and an analyzer. On the other hand, the phase of the isopachics is analyzed 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 setup are derived using Jones calculus. Then, the effectiveness is demonstrated by applying the proposed method to a simple problem.
日本実験力学会の論文