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A comparison of stochastic and effective medium approaches to the backscattered signal from a porous layer in a solid matrix

The paper demonstrates by numerical simulation that the ultrasonic signal reflected by cavities/pores can be modelled by an effective medium rather than as discrete scatterers, resulting in simpler and faster computation. The application is for detection of porosity in aerospace composites; these simulations underpin the development of advanced imaging techniques in collaboration with the University of Bristol (Paul Wilcox: p.wilcox@bristol.ac.uk). Part-funders were Airbus (Kathryn Atherton: Kathryn.atherton@airbus.com) and Rolls-Royce (Tony Dunhill: tony.dunhill@rolls-royce.com), with algorithms implemented by Qinetiq (Robert Smith: rasmith@qinetiq.com). The paper led to an invitation to speak at the Acoustics 2012 conference in Nantes, April 2012.