Abstract
Ultrasonic matrix array transducers have the advantage of receiving flaw echoes simultaneously at various points on a flat surface of the test material. Here we propose 3‐D imaging techniques to reconstruct flaw shapes with the array transducer. These techniques are based on linearized inverse scattering methods in the frequency domain. The principal operation of these methods is the integration of the wave data in the K‐space. In this study, the 3‐D fast Fourier transform is introduced into the inversion algorithm to evaluate the integral in the K‐space. Performance of the 3‐D imaging technique is demonstrated by using the numerically calculated waveforms by the fast multipole BEM.
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