%0 Conference Paper
%A Arslan Ali Khan, R.
%A Ellis, G.A.
%D 2011
%F scholars:1569
%K Attenuation; Burgers; Constant density; Constant thickness; Controlled laboratories; Difference frequency; Fresh Water; Fundamental frequencies; Inhomogeneities; Inter-modulation products; Nonlinear; Water-saturated sand, Acoustic wave propagation; Acoustics; Plywood; Sustainable development; Transducers; Wave propagation; Waves; Wood products, Intermodulation
%R 10.1109/NatPC.2011.6136426
%T Modelling and characterization of acoustic wave propagation in seabed
%U https://khub.utp.edu.my/scholars/1569/
%X In this paper, acoustic wave propagation in water-saturated sand under controlled laboratory conditions is investigated. Our method uses a combination of two fundamental frequencies f 1 & f 2 generated using piezoelectric transducers placed on the surface of the sand, simulating seabed with fresh water and sand. The interaction of sound (acoustic) waves in a dispersive but homogenous medium will typically generate harmonics and intermodulation terms (intermod). These interactions result in perturbations as the sum and difference frequencies. The results show that the amplitude of the intermodulation products is inversely proportional to the density and thickness of the buried inhomogeneity. For instance, 2 nd order intermod term show 2 dB decreases in amplitude for 7 mm increase in thickness at constant density of plywood. For constant thickness at 5 mm there is 10 dB drop in same intermod term for change in density from plywood 550 Kg/m 3 to copper 8930 Kg/m 3. © 2011 IEEE.
%Z cited By 0; Conference of 3rd National Postgraduate Conference - Energy and Sustainability: Exploring the Innovative Minds, NPC 2011 ; Conference Date: 19 September 2011 Through 20 September 2011; Conference Code:88531