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Imagerie acoustique instationnaire par retournement temporel en environnement complexe

Abstract : The time reversal imaging process is a widely technique used for source localiza-tion and characterization. In this paper, several improvements are proposed allowing to use efficiently this imaging method whatever the measurements conditions, even if the environment is highly reverberant and noisy. All of the improvements was developped taking advantage of the use of a hemispherical array using pressure-pressure probes, giving acces to he sound pressure field and its normal derivative. The proposed time reversal method was optimized to reconstruct a sound pressure field precisely both in time and space domains with a high resolution. An experiment led in a reverberant and 22 ème Congrès Français de Mécanique Lyon, 24 au 28 Août 2015 noisy room (poor signal-to-noise ratio) demonstrates the ability of the proposed method to back-propagate acoustic waves radiated from a non-stationary source in the volume delimited by the measurement array with a high precision both in time and space domains.
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https://hal.archives-ouvertes.fr/hal-02088407
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Submitted on : Tuesday, April 2, 2019 - 7:19:09 PM
Last modification on : Tuesday, May 18, 2021 - 12:11:37 PM
Long-term archiving on: : Wednesday, July 3, 2019 - 5:51:01 PM

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  • HAL Id : hal-02088407, version 1

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Stéphanie Lobréau, Eric Bavu, Manuel Melon. Imagerie acoustique instationnaire par retournement temporel en environnement complexe. 22ème Congrès Français de Mécanique - CFM 2015, Aug 2015, Lyon, France. ⟨hal-02088407⟩

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