Anomalous behaviour of leaky surface waves for stiffening layer near cutoff
- 1 August 1997
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 82 (3), 1031-1035
- https://doi.org/10.1063/1.365867
Abstract
The propagation of surface acoustic waves has been investigated for a layered system (water-isotropic layer-isotropic substrate) where the layer is faster than the substrate. It has been found that when the velocity of the surface wave reaches the velocity of the shear wave of the substrate (cutoff) the behaviour of the attenuation has an anomalous character. Attenuation drops down towards zero below cutoff and increases abruptly beyond cutoff. Acoustic microscopy measurements on aluminum coated with oxalic oxide film were in coincidence with theory.Keywords
This publication has 10 references indexed in Scilit:
- Matrix techniques for modeling ultrasonic waves in multilayered mediaIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1995
- The detection of thin embedded layers using normal incidence ultrasoundUltrasonics, 1994
- Cut-off characteristics of leaky Sezawa and pseudo-Sezawa wave modes for thin-film characterizationApplied Physics Letters, 1990
- A two-dimensional imaging theory of surface discontinuities with the scanning acoustic microscopeProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1985
- Material Characterization by Line-Focus-Beam Acoustic MicroscopeIEEE Transactions on Sonics and Ultrasonics, 1985
- Reflection of finite acoustic beams from loaded and stiffened half-spacesThe Journal of the Acoustical Society of America, 1984
- On the plane-wave reflection coefficient and nonspecular reflection of bounded beams for layered half-spaces underwaterThe Journal of the Acoustical Society of America, 1983
- Effect of leaky SAW parameters on V(z) curves obtained by acoustic microscopyElectronics Letters, 1982
- Ray interpretation of the material signature in the acoustic microscopeElectronics Letters, 1979
- The Absorption of Ultrasonic Waves in Liquids and its Relation to Molecular ConstitutionProceedings of the Physical Society. Section B, 1949