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    The acoustic field on the forehead of echolocating Atlantic bottlenose dolphins (Tursiops truncatus)

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    JAS001426.pdf (853.6Kb)
    Date
    2010-09
    Author
    Au, Whitlow W. L.  Concept link
    Houser, Dorian S.  Concept link
    Finneran, James J.  Concept link
    Lee, Wu-Jung  Concept link
    Talmadge, Lois A.  Concept link
    Moore, Patrick W.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4276
    As published
    https://doi.org/10.1121/1.3372643
    DOI
    10.1121/1.3372643
    Keyword
     Acoustic field; Acoustic signal detection; Bioacoustics; Biocommunications; Hydrophones; Underwater sound; Zoology 
    Abstract
    Arrays of up to six broadband suction cup hydrophones were placed on the forehead of two bottlenose dolphins to determine the location where the beam axis emerges and to examine how signals in the acoustic near-field relate to signals in the far-field. Four different array geometries were used; a linear one with hydrophones arranged along the midline of the forehead, and two around the front of the melon at 1.4 and 4.2 cm above the rostrum insertion, and one across the melon in certain locations not measured by other configurations. The beam axis was found to be close to the midline of the melon, approximately 5.4 cm above the rostrum insert for both animals. The signal path coincided with the low-density, low-velocity core of the melon; however, the data suggest that the signals are focused mainly by the air sacs. Slight asymmetry in the signals were found with higher amplitudes on the right side of the forehead. Although the signal waveform measured on the melon appeared distorted, when they are mathematically summed in the far-field, taking into account the relative time of arrival of the signals, the resultant waveform matched that measured by the hydrophone located at 1 m.
    Description
    Author Posting. © Acoustical Society of America, 2010. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 128 (2010): 1426-1434, doi:10.1121/1.3372643.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of the Acoustical Society of America 128 (2010): 1426-1434
     

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