Investigation of time-reversal approach for detection and characterization of ultrasonic defects in dispersive plates

Abstract

In this paper we investigated the application of time-reversal method for inspecting of defects in plates where Lamb waves suffer dispersion. Theoretical implementation of the time reversal method was carried out by the commercially available finite element analysis software Abaqus Explicit™. It has been demonstrated that the input wave form sent by a transmitting transducer was reconstructed. In the plate with a defect the reconstructed signal differs from the input signal in shape. That difference correlates with geometrical parameters of the defect.