| HAL : hal-00563872, version 1 |
| DOI : 10.1063/1.3544503 |
| Fiche détaillée | Récupérer au format |
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| Journal of Applied Physics 109, 3 (2011) 034903 |
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| Locating a weak change using diffuse waves: Theoretical approach and inversion procedure |
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| Vincent Rossetto 1Ludovic Margerin 2 |
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| (03/02/2011) |
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| We describe a time-resolved monitoring technique for heterogeneous media. Our approach is based on the spatial variations of the cross-coherence of diffuse waves acquired at fixed positions but at different dates. The technique applies to all kind of waves, provided that waveforms can be acquired with a sampling frequency much larger than the wave frequency. To locate and characterize a weak change that occurred between successive acquisitions, we use a maximum likelihood approach combined with a diffusive propagation model. We characterize this technique, locating a weak change using diffuse waves, called LOCADIFF, with the aid of numerical simulations. In several illustrative examples, we show that the change can be located with a precision of a few wavelengths and that its effective scattering cross-section can be retrieved. We investigate how the accuracy and precision of the method depends on the number of source-receiver pairs, on the time window used to compute the cross-correlation and on the errors in the propagation model. Applications can be found in nondestructive testing, seismology, radar, and sonar location. |
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| 1 : | Laboratoire de physique et modélisation des milieux condensés (LPMMC) |
| CNRS : UMR5493 – Université Joseph Fourier - Grenoble I | |
| 2 : | Institut de recherche en astrophysique et planétologie (IRAP) |
| CNRS : UMR5277 – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées | |
| 3 : | Institut des sciences de la Terre (ISTerre) |
| CNRS : UMR5275 – IFSTTAR – Université de Savoie – Université Joseph Fourier - Grenoble I – INSU – OSUG – Institut de recherche pour le développement [IRD] : UR219 | |
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| Ondes et structures |
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| Domaine | : | Physique/Mécanique/Acoustique Sciences de l'ingénieur/Acoustique Physique/Mécanique/Matériaux et structures en mécanique Sciences de l'ingénieur/Mécanique/Matériaux et structures en mécanique Physique/Physique/Physique Générale |
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| acoustic wave propagation – maximum likelihood estimation – numerical analysis |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| hal-00563872, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00563872 | |
| oai:hal.archives-ouvertes.fr:hal-00563872 | |
| Contributeur : Vincent Rossetto-Giaccherino | |
| Soumis le : Lundi 7 Février 2011, 14:52:57 | |
| Dernière modification le : Mercredi 28 Mars 2012, 11:54:59 | |