Abstract
Inverse scattering imaging methods (ISIMs) conducted with an ultrasonic array transducer have been proposed to reconstruct the geometry of flaws in structural metal components. The ISIMs are based on the linearization technique with the Born and Kirchhoff approximations. The Born-type and Kirchhoff-type ISIMs reconstruct the volume and boundary of flaws, respectively. The performance of the ISIMs has already been checked by numerical simulations in our previous studies. In this paper, shape reconstructions of artificial flaws are demonstrated with an electronic ultrasonic scan device. Here we propose a signal−processing method to extract scattered wave components from measured signals, which are necessary for inputs of the ISIMs. From the imaging results, it is confirmed that the flaw reconstructions are successful for a thin slit as well as drilled holes in aluminum specimens.
