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Directivity Pattern of Low-Frequency Atmospheric Sound Excited by Sources in Water

Directivity Pattern of Low-Frequency Atmospheric Sound Excited by Sources in Water The article considers the directivity of atmospheric infrasound radiation excited by monopole and dipole sources placed in an aquatic medium. It is shown that there are two types of equivalent secondary sources, which are located at the interface between media. One of the sources is local, and its characteristics are completely determined by the near field of the primary source. The second source is distributed and associated with the presence of vertical surface perturbations that propagate at the speed of sound in water along the interface. Due to strong attenuation of the amplitude as with increasing distance from the primary source, such a secondary source has a wide directivity pattern. The qualitative reasoning presented in the article and the results of numerical simulation make it possible to determine the directivity pattern of low-frequency sound radiation in air as a function of the type and depth of immersion of the primary source, which can be used for remote study of the atmospheric properties near the sea surface, as well as the properties of the surface itself. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acoustical Physics Springer Journals

Directivity Pattern of Low-Frequency Atmospheric Sound Excited by Sources in Water

Acoustical Physics , Volume 67 (5) – Sep 1, 2021

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Publisher
Springer Journals
Copyright
Copyright © Pleiades Publishing, Ltd. 2021. ISSN 1063-7710, Acoustical Physics, 2021, Vol. 67, No. 5, pp. 520–527. © Pleiades Publishing, Ltd., 2021. Russian Text © The Author(s), 2021, published in Akusticheskii Zhurnal, 2021, Vol. 67, No. 5, pp. 542–550.
ISSN
1063-7710
eISSN
1562-6865
DOI
10.1134/s1063771021050031
Publisher site
See Article on Publisher Site

Abstract

The article considers the directivity of atmospheric infrasound radiation excited by monopole and dipole sources placed in an aquatic medium. It is shown that there are two types of equivalent secondary sources, which are located at the interface between media. One of the sources is local, and its characteristics are completely determined by the near field of the primary source. The second source is distributed and associated with the presence of vertical surface perturbations that propagate at the speed of sound in water along the interface. Due to strong attenuation of the amplitude as with increasing distance from the primary source, such a secondary source has a wide directivity pattern. The qualitative reasoning presented in the article and the results of numerical simulation make it possible to determine the directivity pattern of low-frequency sound radiation in air as a function of the type and depth of immersion of the primary source, which can be used for remote study of the atmospheric properties near the sea surface, as well as the properties of the surface itself.

Journal

Acoustical PhysicsSpringer Journals

Published: Sep 1, 2021

References