Abstract
A method for determining stress components from a single image is proposed in two-dimensional interferometric photoelasticity. A two-dimensional birefringent specimen placed in a Mach–Zehnder interferometer is observed using a CCD camera equipped with a pixelated micro-retarder array. The light emerging from the Mach–Zehnder interferometer contains the information of the difference and the sum of principal stresses, and the principal direction. The distribution of the Stokes parameters of the light vector is determined from a single image since the CCD camera with a micro-retarder array can instantaneously record multiple pieces of information. Then, the distribution of the stress components can be evaluated from the Stokes parameters. It is expected that this method can be applied to time-varying phenomena since multiple exposures are not necessary for the completion of stress components analysis.
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