Control of directivity of PVDF hydrophones using anisotropic substrates

Andrew Munyard, David Matthews

    Research output: Chapter in Book/Conference paperConference paper

    Abstract

    Development of a compact underwater sound intensity sensor based on the “two hydrophone” (or ‘p-p’) principle would be very useful for many underwater applications. Attempts to develop sound intensity probes based on the combination of particle velocity and pressure sensors have been reported by some authors but their suitability for use on a moving platform is unconvincing. Our previous work focused on using piezoelectric PVDF polymer films to construct such a p-p sound intensity sensor. This showed some promising results but difficulties arose in compensating for the directivity of the individual pressure sensor films. Ideally these should be omni-directional in order to accurately estimate the sound pressure gradient using the finite difference approximation. By using anisotropic backing materials it has been possible to control the directionality of the PVDF films up to frequencies as high as 50 kHz. The effect of various substrate anisotropies on the directionality is discussed.
    Original languageEnglish
    Title of host publicationProceedings of Acoustics 2016
    Subtitle of host publicationThe Second Australasian Acoustical Societies' Conference
    EditorsDavid J. Mee, Ian D. M. Hillock
    PublisherAustralian Acoustical Society
    Pages1-9
    ISBN (Electronic)978-0-909882-26-6
    Publication statusPublished - Nov 2016
    EventSecond Australasian Acoustical Societies Conference - Brisbane, Australia
    Duration: 9 Nov 201611 Nov 2016

    Conference

    ConferenceSecond Australasian Acoustical Societies Conference
    CountryAustralia
    CityBrisbane
    Period9/11/1611/11/16

    Fingerprint

    sound intensity
    hydrophones
    directivity
    pressure sensors
    sensors
    underwater acoustics
    backups
    sound pressure
    pressure gradients
    platforms
    anisotropy
    probes
    polymers
    estimates
    approximation

    Cite this

    Munyard, A., & Matthews, D. (2016). Control of directivity of PVDF hydrophones using anisotropic substrates. In D. J. Mee, & I. D. M. Hillock (Eds.), Proceedings of Acoustics 2016: The Second Australasian Acoustical Societies' Conference (pp. 1-9). Australian Acoustical Society.
    Munyard, Andrew ; Matthews, David. / Control of directivity of PVDF hydrophones using anisotropic substrates. Proceedings of Acoustics 2016: The Second Australasian Acoustical Societies' Conference. editor / David J. Mee ; Ian D. M. Hillock. Australian Acoustical Society, 2016. pp. 1-9
    @inproceedings{e5203336d5404f628e07ffcae45f8ac2,
    title = "Control of directivity of PVDF hydrophones using anisotropic substrates",
    abstract = "Development of a compact underwater sound intensity sensor based on the “two hydrophone” (or ‘p-p’) principle would be very useful for many underwater applications. Attempts to develop sound intensity probes based on the combination of particle velocity and pressure sensors have been reported by some authors but their suitability for use on a moving platform is unconvincing. Our previous work focused on using piezoelectric PVDF polymer films to construct such a p-p sound intensity sensor. This showed some promising results but difficulties arose in compensating for the directivity of the individual pressure sensor films. Ideally these should be omni-directional in order to accurately estimate the sound pressure gradient using the finite difference approximation. By using anisotropic backing materials it has been possible to control the directionality of the PVDF films up to frequencies as high as 50 kHz. The effect of various substrate anisotropies on the directionality is discussed.",
    author = "Andrew Munyard and David Matthews",
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    language = "English",
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    Munyard, A & Matthews, D 2016, Control of directivity of PVDF hydrophones using anisotropic substrates. in DJ Mee & IDM Hillock (eds), Proceedings of Acoustics 2016: The Second Australasian Acoustical Societies' Conference. Australian Acoustical Society, pp. 1-9, Second Australasian Acoustical Societies Conference, Brisbane, Australia, 9/11/16.

    Control of directivity of PVDF hydrophones using anisotropic substrates. / Munyard, Andrew; Matthews, David.

    Proceedings of Acoustics 2016: The Second Australasian Acoustical Societies' Conference. ed. / David J. Mee; Ian D. M. Hillock. Australian Acoustical Society, 2016. p. 1-9.

    Research output: Chapter in Book/Conference paperConference paper

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    AB - Development of a compact underwater sound intensity sensor based on the “two hydrophone” (or ‘p-p’) principle would be very useful for many underwater applications. Attempts to develop sound intensity probes based on the combination of particle velocity and pressure sensors have been reported by some authors but their suitability for use on a moving platform is unconvincing. Our previous work focused on using piezoelectric PVDF polymer films to construct such a p-p sound intensity sensor. This showed some promising results but difficulties arose in compensating for the directivity of the individual pressure sensor films. Ideally these should be omni-directional in order to accurately estimate the sound pressure gradient using the finite difference approximation. By using anisotropic backing materials it has been possible to control the directionality of the PVDF films up to frequencies as high as 50 kHz. The effect of various substrate anisotropies on the directionality is discussed.

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    Munyard A, Matthews D. Control of directivity of PVDF hydrophones using anisotropic substrates. In Mee DJ, Hillock IDM, editors, Proceedings of Acoustics 2016: The Second Australasian Acoustical Societies' Conference. Australian Acoustical Society. 2016. p. 1-9