Whole-Field Determination of Isoclinics by Three-Step Color Phase Shifting

摘要

The goal of this paper is to present a three-step color phase shifting approach for automatic determination of the whole-field isoclinic parameter based on the results of photoelastic experiment. A plane polariscope is used with a white light. Relevant theories of the intensity equations and the optimum phase shift angle are derived. The optimum phase shift angle is numerically determined. The obtained wrapped phase data is unwrapped to the true phase interval by the unwrapping process. The obtained results show not only the method allows the isoclinic parameter to be evaluated with almost free from the influence of the isochromatics but also the isoclinic map coincides with theory.