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    Acoustic characterization of encapsulated microbubbles at seismic frequencies

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    SCHOEN-THESIS-2013.pdf (15.70Mb)
    Date
    2013-12
    Author
    Schoen, Scott Joseph, Jr.
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    Abstract
    Encapsulated microbubbles, whose diameters are on the order of microns, are widely used to provide acoustic contrast in biomedical applications. But well below the resonance frequencies of these microbubbles, any acoustic contrast is due solely to their relatively high compressibility compared to the surrounding medium. To estimate how well microbubbles may function as acoustic contrast agents in applications such as borehole logging or underground flow mapping, it must be determined how they behave both at atmospheric and down-well conditions, and how their presence affects the bulk acoustic properties of the surrounding medium, most crucially its specific acoustic impedance. Resonance tube experiments were performed on several varieties of acoustic contrast agents to determine their compressibility as a function of pressure and temperature, and the results are used to estimate the effect on sound propagation when they are introduced into rock formations.
    Department
    Mechanical Engineering
    Description
    text
    Subject
    Acoustics
    Bubbles
    Microbubbles
    Resonance tube
    Effective media
    Poroelasticity
    URI
    http://hdl.handle.net/2152/23911
    http://hdl.handle.net/2152/28496
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