FLAW RECONSTRUCTION BY ELASTODYNAMIC LINEARIZED INVERSION WITH MULTI-POINT MEASUREMENTS

Abstract

The elastodynamic inversions for the ultrasonic pitch-catch mode are investigated in order to take advantage of the waveforms measured at multi-points. The inversion is based on Born or Kirchhoff approximation to linearize the integral expression for the scattered wave. The multi-point measurements are applied to the shape reconstructions for two flaws of a cavity and a crack. It is confirmed that the adjacent part of two flaws is clearly reconstructed by the multi- point measurements, even though the dynamic interaction effects of flaws are included in the measured waveforms.