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Simulation of incoherent and coherent backscattered wave fields from cavities in a solid matrix

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journal contribution
posted on 08.01.2013 by Valerie Pinfield, Richard E. Challis
This paper reports a study of the backscattered ultrasonic signal from a solid layer containing spherical cavities, to determine the conditions in which an effective medium model is a valid description of the response. The work is motivated by the need to model the response of porous composite materials for ultrasonic non-destructive evaluation (NDE) techniques. The numerical simulation predicts the response of a layer containing cavities at a single set of random locations, and compares it to the predicted response from a homogeneous layer with ensemble-averaged material properties (effective medium model). The study investigates the conditions in which the coherent (ensembleaveraged) response is obtained even from a single configuration of scatterers. Simulations are carried out for a range of cavity sizes and volume fractions. The deviation of the response from effective medium behavior is modeled, along with the trends as a function of cavity radius, volume fraction, and frequency, in order to establish an acceptability criterion for application of an effective medium model.



  • Aeronautical, Automotive, Chemical and Materials Engineering


  • Chemical Engineering


PINFIELD, V.J. and CHALLIS, R.E., 2012. Simulation of incoherent and coherent backscattered wave fields from cavities in a solid matrix. Journal of the Acoustical Society of America, 132 (6), pp.3760-3769.


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