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Dynamic imaging of a capillary-gravity wave in shallow water using amplitude variations of eigenbeams

Abstract : Dynamic acoustic imaging of a surface wave propagating at an air-water interface is a complex task that is investigated here at the laboratory scale through an ultrasonic experiment in a shallow water waveguide. Using a double beamforming algorithm between two source-receiver arrays, the authors isolate and identify each multi-reverberated eigenbeam that interacts with the air-water and bottom interfaces. The waveguide transfer matrix is recorded 100 times per second while a low-amplitude gravity wave is generated by laser-induced breakdown at the middle of the waveguide, just above the water surface. The controlled, and therefore repeatable, breakdown results in a blast wave that interacts with the air-water interface, which creates ripples at the surface that propagate in both directions. The amplitude perturbations of each ultrasonic eigenbeam are measured during the propagation of the gravity-capillary wave. Inversion of the surface deformation is performed from the amplitude variations of the eigenbeams using a diffraction-based sensitivity kernel approach. The accurate ultrasonic imaging of the displacement of the air-water interface is compared to simultaneous measurements with an optical camera, which provides independent validation.
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Submitted on : Tuesday, November 26, 2019 - 11:55:35 AM
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Tobias van Baarsel, Philippe Roux, Jérôme I. Mars, Julien Bonnel, Michel Arrigoni, et al.. Dynamic imaging of a capillary-gravity wave in shallow water using amplitude variations of eigenbeams. Journal of the Acoustical Society of America, Acoustical Society of America, 2019, 146 (5), pp.3353-3361. ⟨10.1121/1.5132939⟩. ⟨hal-02380508⟩

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