A phase unwrapping method that employs scattered-light photoelasticity with unpolarized light wasproposed for automated three-dimensional stress analysis [Appl. Opt. 45, 8848 (2006)]. I now demonstrate the validity of this method by performing nondestructive measurements at three different wavelengths of the secondary principal stress direction (psi)_(j) and the total relative phase retardation (rho)_(jtot) in the plane that contains the rotated principal stress directions in a spherical frozen stress model and compare the results obtained with mechanically sliced models. The parameters (psi)_(j) and (rho)_(jtot) were measured non-destructively over the entire field of view for the first time, to the best of my knowledge.
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