A method for measuring time-variant strain distributions usingimaging polarimetry

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A method for analyzing the fringe pattern from a single image is proposed for interferometry and photoelasticity. The emerging light from a polariscope or an interferometer is analyzed using anoptical setup of a polarimeter that is composed of two Savart plates, a half-wave plate, and an analyzer. Then, the distributions of the Stokes parameters are obtained. The phase distribution of the fringe pattern produced by the interferometer is then calculated from these Stokes parameters. Similarly, the phases of the isochromatics and the isoclinics in photoe-lasticity are obtained by analyzing the emerging light from the polariscope. The effectiveness of the proposed method is validated by simple experiments of interferometry and photoelasticity. Results show that the fringe pattern analysis from a single image is possible by the proposed meth-od.