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    Biosonar emission characteristics and beam control of odontocetes

    Access Status
    Fulltext not available
    Authors
    Song, Zhongchang
    Zhang, Yu
    Wei, Chong
    Yang, Wuyi
    Xu, Xiaohui
    Date
    2020
    Type
    Journal Article
    
    Metadata
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    Citation
    Song, Z. and Zhang, Y. and Wei, C. and Yang, W. and Xu, X. 2020. Biosonar emission characteristics and beam control of odontocetes. Acta Physica Sinica. 69 (15): Article No. 154301.
    Source Title
    Acta Physica Sinica
    DOI
    10.7498/aps.69.20200406
    ISSN
    1000-3290
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/80487
    Collection
    • Curtin Research Publications
    Abstract

    Odontocetes have evolved for millions of years to own a unique echolocation system. The exceptional performance of odontocetes echolocation system can provide reference to artificial sonar systems, acoustic metamaterials and sound control designs. Research on odontocetes biosonar requires interdisciplinary effort, including acoustics, biology, biomimetics, anatomy, physiology and signal analysis. In this paper, we review odontoctes’ biosonar emission process from aspects of anatomy, biosonar signal and beam formation. To begin, computed tomography scanning and untrasound measurements are combined to reconstruct the sound speed and density distributions. To follow, efforts are thrown to probe into the biosonar signal and its corresponding acoustic behavior. Numerical simulations are used to investigate the odontocetes’ biosonar beam formation. The secret of exceptional performance of odontocetes’ echolocation system lies in their unique anatomy. Odontocete integrates acoustic structures with different acoustic impedances, namely solid bony structures, air space and soft tissues as a whole emission system to efficiently modulate sound propagation and sound beam formation. These acoustic structures are well organized in the forehead, forming a natural acoustic metamaterial to perform a good control of sounds. These results can enlighten artificial sonar designs.

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