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Acoustic MicroscopySecond Edition$
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Andrew Briggs and Oleg Kolosov

Print publication date: 2009

Print ISBN-13: 9780199232734

Published to Oxford Scholarship Online: February 2010

DOI: 10.1093/acprof:oso/9780199232734.001.0001

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A little elementary acoustics

A little elementary acoustics

Chapter:
(p.74) 6 A little elementary acoustics
Source:
Acoustic Microscopy
Author(s):

G. A. D. Briggs

O. V. Kolosov

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199232734.003.0006

Solids support both longitudinal and shear acoustic waves; fluids support only longitudinal waves, with attenuation proportional to the viscosity and to the square of the frequency. The longitudinal and shear velocities in solids can be found from tensor analysis, and in isotropic materials can be related to their elastic moduli. Rayleigh waves at surfaces have both longitudinal and shear components, and a velocity slightly lower than the shear wave velocity. Reflection at an interface can be calculated from the impedance of the media on either side and the angle of incidence. The reflectance function of waves in a fluid at a solid surface shows features associated with Rayleigh wave excitation around the appropriate angle of incidence, which play a vital role in acoustic microscopy.

Keywords:   longitudinal shear, attenuation, tensor, isotropic, elastic modulus, Rayleigh, impedance, reflection, reflectance function, materials parameters

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