Publication Date:
2022-05-27
Description:
© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Bonnel, J., Flamant, J., Dall’Osto, D. R., Le Bihan, N., & Dahl, P. H. Polarization of ocean acoustic normal modes. Journal of the Acoustical Society of America, 150(3), (2021): 1897–1911, https://doi.org/10.1121/10.0006108.
Description:
In ocean acoustics, shallow water propagation is conveniently described using normal mode propagation. This article proposes a framework to describe the polarization of normal modes, as measured using a particle velocity sensor in the water column. To do so, the article introduces the Stokes parameters, a set of four real-valued quantities widely used to describe polarization properties in wave physics, notably for light. Stokes parameters of acoustic normal modes are theoretically derived, and a signal processing framework to estimate them is introduced. The concept of the polarization spectrogram, which enables the visualization of the Stokes parameters using data from a single vector sensor, is also introduced. The whole framework is illustrated on simulated data as well as on experimental data collected during the 2017 Seabed Characterization Experiment. By introducing the Stokes framework used in many other fields, the article opens the door to a large set of methods developed and used in other contexts but largely ignored in ocean acoustics.
Description:
This work was supported by the Direction Générale de l'Armement (France) and the Office of Naval Research. The authors warmly thank the anonymous “Reviewer 2” for excellent comments and suggestions.
Repository Name:
Woods Hole Open Access Server
Type:
Article
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