PinfieldChallisSmith2011.pdf (1.2 MB)
A comparison of stochastic and effective medium approaches to the backscattered signal from a porous layer in a solid matrix
journal contribution
posted on 2012-12-04, 11:55 authored by Valerie PinfieldValerie Pinfield, Richard E. Challis, Robert A. SmithThis paper reports a study of the backscattering behavior of a solid layer containing randomly spaced spherical cavities in the long wavelength limit. The motivation for the work arises from a need to model the responses of porous composite materials in ultrasonic NDE procedures. A comparison is made between models based on a summation over discrete scatterers, which show interesting emergent properties, and an integral formulation based on an ensemble average, and with a simple slab effective medium approximation. The similarities and differences between these three models are demonstrated. A simple quantitative criterion is established which sets the maximum frequency at which ensemble average or equivalent homogeneous medium models can represent echo signal generation in a porous layer for given interpore spacing, or equivalently, given pore size and concentration.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Citation
PINFIELD, V.J., CHALLIS, R.E. and SMITH, R.A., 2011. A comparison of stochastic and effective medium approaches to the backscattered signal from a porous layer in a solid matrix. Journal of the Acoustical Society of America, 130 (1), pp.122-134.Publisher
© Acoustical Society of AmericaVersion
- VoR (Version of Record)
Publication date
2011Notes
This article was published in the Journal of the Acoustical Society of America and is also available at: http://dx.doi.org/10.1121/1.3598461ISSN
0001-4966Publisher version
Language
- en