1999 Volume 42 Issue 3 Pages 396-402
In this paper, the authors describe a new method for determining the fringe order and the principal direction of birefringence from a single image. Using an elliptically polarized tricolored light and color image processing, the fringe order and the principal direction of birefringence are obtained from data of a color image obtained by a single shot. The theory of the proposed method and the entire experimental and analytical system are described. Then, a successful application of the method to 2-D photoelastic analysis is demonstrated. It is emphasized that this method can be applied to time-dependent phenomena, since multiple exposures are not necessary for sufficient data acquisition in the completion of stress analysis.