In this paper, a digital photoelastic system was employed to observe the stress distribution generated by an ultrasonic wave impinged at the edge of a strip. According to the classical photoelastic theory, gray level distribution of the photoelastic fringe patterns was formulated and expressed in the form of 1 À J 0 D ð Þ ½ g , where J 0 is the zeroth-order Bessel function. This new technique is called the timeaveraged photoelastic method. To verify the proposed method, the distribution of 1 À J 0 D ð Þ ½ g was superimposed onto the distribution of gray level of the experimentally obtained photoelastic fringe pattern caused by standing wave only. Except regions near the center of fringes, well-matched results were found.
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