DEFECT SIZING METHOD USING ULTRASONIC GUIDED WAVES IN PIPES.

This paper presents a defect-sizing method using swept-frequency guided waves. In this technique, reflection coefficients of multiple frequencies were measured, and the coefficients were compared with the 3-D analysis result that was calculated by integration of reflection waves from divided calculation-regions that had different characteristic acoustical impedances. The effectiveness of the method was evaluated experimentally using torsional mode guided waves that propagated in pipe specimens. The experimental results were in good agreement with analysis results. [ABSTRACT FROM AUTHOR]