Correction of Errors due to Inaccurate Circular-Polarized Incident Light and Quarter-Wave Plate in Photoelasticity

概要

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A correction method of the relative retardation ρ and the angle φ of the principal stresses obtained in photoelasticity using Stokes parameter method is described. These errors are due to those of azimuth, ellipticity of the circular-polarized incident light and the phase difference of the quarter-wave plate used on the observing side. The Stokes parameter S3 in this method is obtained from both the intensities measured by the set of the circular polarizer and a rotated quarter-wave plate by 90°. The analysis using S<SUB>3</SUB> obtained in this method is in higher accuracy than the previous methods without the correction calculation, though the corrected value of ρ is obtained by approximation neglecting square term of error. The φ corrected is obtained without approximation. This method is also capable of applying to a different wavelength incident light.
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