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A Fourier domain numerical reconstruction technique has been created in order to eliminate the time spread of Lamb wave signals caused by their dispersive nature. This method allows a good time compaction of the echoes obtained from a Lamb wave inspection. In a pulse-echo setup, reflection peaks coming from targets located close one from each other that could not be separated or seen within raw signals...
Synthetic aperture focusing technique (SAFT) algorithm in the Fourier domain (F-SAFT) has been modified to take into account the dispersive nature of Lamb waves. This new algorithm can be used to produce good ultrasonic images of a plate structure for both dispersive and non-dispersive parts of the Lamb wave dispersion curve. This imaging technique has been tested by performing an inspection in a...
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