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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/11084

Title: A comparison of stochastic and effective medium approaches to the backscattered signal from a porous layer in a solid matrix
Authors: Pinfield, Valerie J.
Challis, Richard E.
Smith, Robert A.
Keywords: Acoustic signal processing
Composite materials
Porous materials
Ultrasonic materials testing
Issue Date: 2011
Publisher: © Acoustical Society of America
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.
Abstract: This 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.
Description: This article was published in the Journal of the Acoustical Society of America and is also available at: http://dx.doi.org/10.1121/1.3598461
Version: Published
URI: https://dspace.lboro.ac.uk/2134/11084
Publisher Link: http://asadl.org/jasa/
ISSN: 0001-4966
Appears in Collections:Published Articles (Chemical Engineering)

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