Air-Coupled Ultrasonic Transducers for the Detection of Defects in Plates

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1996
Authors
Castaings, M.
Cawley, P.
Farlow, R.
Hayward, G.
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Altmetrics
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Abstract

In order to minimise the problems due to the acoustic impedance mismatch between solids and air, the non destructive testing of materials using ultrasonic transducers generally requires either contact transducers or immersion transducers to be used [1]. Air-coupled transducers however would be very advantageous for testing structures which must be not contaminated with couplant and also for all in-situ industrial applications. Although the propagation of ultrasonic waves from laser generation [2] involves air-coupling, the difficulties due to the experimental set-up of this technique and the financial investment it implies are two major disadvantages.

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