A Study of Measurement Method of Scattered Light Photoelasticity using Unpolarized Light by Poincar6 Sphere

Abstract

The stress analysis of a three-dimensional photoelastic model having the rotation of the principal stress can be obtained by scattered-light photoelasticity using unpolarized light. The relative phase retardation, ρi^j, and the secondary principal stress directions, Ψ^j and Ψ^j+π/2, of a linear retarder for a distance in the solid model are expressed in terms of measurable Stokes parameters. In this paper, the measurement method of ρi^j and Ψ^j was proved on the Poincare sphere. ρi^j and Ψ^j were found from the relation of the inner product of the Stokes vectors of the scattered lights from the model and some features of the method were cleared.