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The method with which a Lamb wave of the required mode is generated and detected by electronically adjusting the incident angle using a linear array probe, and its application to flaw detection is presented. To test the ability of this method, experiments were carried out using specimens with an artificial flaw. The method was shown to be successful. The two dimensional CRT display method of the detected flaws, in which the polar coordinates consist of the propagation time and the incident angle of the wave, and the brightness corresponds to the amplitude of echo is also presented.
Jitsumori et al. (Wed,) studied this question.