Inverse scattering analysis for a defect in a plate

A Born inversion is applied not only to numerically simulated data but also to the data obtained from the pulse echo ultrasonic experiments using SH probes for a cylindrical cavity in a steel block. For reconstruction, we utilize the data which include the backscattered wave due to the reflection at the bottom of the plate as well as the data which include the direct backscattered wave by the cavity. It is shown that even with the limited amount of data, the Born inversion can produce much better image of the defect than the SAFT can.