Low-frequency ultrasonic NDE of an interphase layer
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An ultrasonic technique for a simultaneous measurement of the acoustical properties of a three-layered medium (adherend/interphase layer/adherend) has been developed. Normally incident longitudinal waves are considered. It is assumed that the wavelength may be large compared to all three thicknesses; this allows the use of low-frequency transducers. The inverse problem has been solved for the following two cases: (1) Simultaneous determination of thickness (h) and wavespeed (c) of any one of the three layers, given h and c for the remaining two; and (2) Simultaneous measurement of the three thicknesses, given the three wavespeeds.
author list (cited authors)
Kinra, V. K., Zhu, C., Jaminet, P., & Iyer, V.