A model for predicting acoustic material signatures
- 1 February 1979
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 34 (3) , 179-181
- https://doi.org/10.1063/1.90741
Abstract
Unique acoustic material signatures (AMS) may be obtained in the reflection acoustic microscope. The proposed model shows that they result from interference between two components reradiated into the immerson fluid at the materials critical Rayleigh angle ϑR. The characteristic period ΔzN of this interference signature varies as the square of the Rayleigh wave velocity and is empirically given by ΔzN=λR/sinϑR, where λR is the Rayleigh wavelength. Materials covering a greater than 3 : 1 velocity range agree well with this physical model. Substitution of the longitudinal wave velocity in the expression extends the range of measurable AMS to acoustically slower materials. A variety of applications for AMS is suggested.Keywords
This publication has 7 references indexed in Scilit:
- Characteristic material signatures by acoustic microscopyElectronics Letters, 1978
- Image resolution of the scanning acoustic microscopeApplied Physics Letters, 1977
- Phase imaging in reflection with the acoustic microscopeApplied Physics Letters, 1977
- Interaction of ultrasonic waves incident at the Rayleigh angle onto a liquid-solid interfaceJournal of Applied Physics, 1977
- Unified theory of Rayleigh-angle phenomena for acoustic beams at liquid-solid interfacesApplied Physics A, 1973
- Ultrasonic reflection of a bounded beam at Rayleigh and critical angles for a plane liquid-solid interfaceJournal of Applied Physics, 1973
- Propagation of Surface Waves at the Boundary Between a Piezoelectric Crystal and a Fluid MediumIEEE Transactions on Sonics and Ultrasonics, 1970