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|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|
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|
|Publisher Link: ||http://asadl.org/jasa/|
|Appears in Collections:||Published Articles (Chemical Engineering)|
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