A study of nondestructive testing with the tilted angle polarization type ultrasonic transducer

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The tilted-angle polarization type piezoelectric (TAPP) transducer is used to generate finite-amplitude guided waves in an aluminum plate. The TAPP transducer is directly coupled to the sample without a wedge. The ultrasonic wave generated by the TAPP is analyzed in both time space and time?frequency space. These experiments clearly show that the 1MHz finite-amplitude wave from the TAPP transducer generates the higher harmonic component of a 2 MHz ultrasonic Lamb wave. The possible application of the harmonic wave of the TAPP transducer in nondestructive evaluation is described.