
Thomas J GrahamSonardyne International Ltd · Engineering
Thomas J Graham
Doctor of Philosophy
About
8
Publications
619
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Introduction
Acoustics physicist specialising in underwater metamaterials.
Additional affiliations
December 2018 - December 2019
September 2014 - September 2018
Education
October 2010 - July 2014
Publications
Publications (8)
This thesis details original experimental work on the observation of the underwater acoustic response of flat plates and acoustic metamaterial-like arrays of holes. There are five main experimental chapters that examine the excitation, detection and analysis of the radiative and evanescent acoustic fields of structured and unstructured surfaces. Th...
Designer mode dispersions with properties such as negative or zero group velocities have applications in tailored wave propagation and energy redistribution. The modes of elastic plates can readily exhibit such phenomena by virtue of their bulk elastic properties and thickness. Here, we investigate the symmetric leaky Lamb modes within a thin flat...
Localized acoustic surface waves supported by a “soft” elastic plate in water are explored. Unlike many materials, such as aluminum, for soft interfaces the Scholte wave, a localized interface wave, has a speed well below that of sound in water, and the energy of the Scholte wave is no longer mainly localized to the water. We note that the Scholte...
Acoustic surface waves are supported at the surface of appropriately structured elastic materials. Here the excitation and propagation of the lowest-order surface mode supported by a square array of open-ended cavities on a metal plate submerged in water is demonstrated. This mode, which has a half-wavelength character in the cavity, arises due to...
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ABSTRACT
Surface waves are supported by unstructured, or appropriately structured, elastic materials. Unstructured plates typically support a number of Surface Acoustic Waves (SAWs) that propagate at the boundary of the elastic materials—these can be bound or leaky. Whilst plates with appropriate structure can support bound Acousti...
In this work, we explore the use of acoustic metamaterials in delivering spatially significant acoustic experiences. In particular, we discuss a user study run in a space where a dedicated composition is played through a metamaterial "prism". Results show users perceive sound to be louder in the direction determined by the metamaterial, depending o...
In this talk, we show how acoustic metamaterials can be used to build the acoustic equivalent of optical devices. We demonstrate two key devices: (1) an acoustic prism, used to send the different notes in a melody towards different directions, and (2) an auto-zoom lens, used to send sound to a moving target. We conclude, discussing potential applic...