Travel-time tomography in shallow water: Experimental demonstration at an ultrasonic scale - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of the Acoustical Society of America Année : 2011

Travel-time tomography in shallow water: Experimental demonstration at an ultrasonic scale

Philippe Roux
Connectez-vous pour contacter l'auteur
Ion Iturbe
  • Fonction : Auteur
  • PersonId : 879832
Barbara Nicolas
Jean Virieux
  • Fonction : Auteur
Jerome I. Mars

Résumé

Acoustic tomography in a shallow ultrasonic waveguide is demonstrated at the laboratory scale between two source-receiver arrays. At a 1/1 000 scale, the waveguide represents a 1.1-km-long, 52- m-deep ocean acoustic channel in the kilohertz frequency range. Two coplanar arrays record the transfer matrix in the time domain of the waveguide between each pair of source-receiver transducers. A time-domain, double-beamforming algorithm is simultaneously performed on the source and receiver arrays that projects the multi-reflected acoustic echoes into an equivalent set of eigenrays, which are characterized by their travel times and their launch and arrival angles. Travel-time differences are measured for each eigenray every 0.1 s when a thermal plume is generated at a given location in the waveguide. Travel-time tomography inversion is then performed using two forward models based either on ray theory or on the diffraction-based sensitivity kernel. The spatially resolved range and depth inversion data confirm the feasibility of acoustic tomography in shallow water. Comparisons are made between inversion results at 1 and 3 MHz with the inversion procedure using ray theory or the finite-frequency approach. The influence of surface fluctuations at the air- water interface is shown and discussed in the framework of shallow-water ocean tomography.
Fichier principal
Vignette du fichier
2011_JASA_Roux_ion.pdf (2.81 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-00625344 , version 1 (21-09-2011)

Identifiants

Citer

Philippe Roux, Ion Iturbe, Barbara Nicolas, Jean Virieux, Jerome I. Mars. Travel-time tomography in shallow water: Experimental demonstration at an ultrasonic scale. Journal of the Acoustical Society of America, 2011, 130 (3), pp.1232-1241. ⟨10.1121/1.3621271⟩. ⟨hal-00625344⟩
464 Consultations
521 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More