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Dixon, S.; Lanyon, B.; Rowlands, G. (George) (2006)
Publisher: American Institute of Physics
Languages: English
Types: Article
Subjects: QC, TK
Identifiers:doi:10.1063/1.2192144
Measurement of the resonant through thickness ultrasonic modes of a homogeneous plate using a fast Fourier transform of the temporal data can be used to calculate plate thickness very accurately. We describe an extension of this principle to two-layer systems, examining a thin coating on a substrate of known properties. The resonant behavior of these systems is predicted and we explain how this approach is used to measure coating thickness and elastic modulus. Noncontact electromagnetic acoustic transducers are used for ultrasonic measurement, as they do not significantly affect the resonant response of the system, unlike alternative contact transducers.
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