FN Archimer Export Format
PT C
TI Ultra-deep low-frequency sub-bottom profilerfor AUV and ROV
BT 
AF LE GALL, Yves
   PACAULT, Anne
   SAINT-LAURENT, Xavier
   VIAENE, Jean-Michel
   MOSCA, Frédéric
   GRENINGUEY, Gilles
   VIAL, Marcel
   AISSA, Jean Claude
AS 1:1;2:1;3:2,3;4:3;5:4;6:4;7:4;8:4;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 IFREMER, Unité Navires et Systèmes embarqués, Service Acoustique Sous-Marine, BP 70, 29280 Plouzané, France
   GENAVIR, DSM-SOE, Zone Portuaire de Brégaillon - CS20 330 - 83507 La Seyne-sur-Mer Cedex
   IFREMER, Unité Systèmes Sous-marins, Service Ingénierie d’Intervention et Développements Mécaniques, Zone Portuaire de Brégaillon - CS20 330 - 83507 La Seyne-sur-Mer Cedex
   IXBLUE, 46, quai François Mitterrand, 13600 LA CIOTAT
C2 IFREMER, FRANCE
   GENAVIR, FRANCE
   IFREMER, FRANCE
   IXBLUE, FRANCE
SI BREST
   TOULON
UR https://archimer.ifremer.fr/doc/00127/23836/21764.pdf
LA English
DT Poster
CR ERIG 3D
BO Pourquoi pas ?
AB Acoustical techniques for ultra-deep sub-bottom exploration are still little investigated. IXSEA and IFREMER have launched in 2006 the development of a new deep-sea low-frequency sub-bottom profiler, working up to 6000 meters depth. Based on the Janus-Helmholtz broadband technology, two acoustic sources have been modelled, achieved and in-tank and at-sea measured : a single transducer working in the [1.8, 6.2 kHz] frequency band, and a three-transducer array operating in the [2, 8 kHz] frequency band. In both cases, vertical resolution is better that 20 cm. Comparison between finite element modelling and in-tank measurements is presented, together with the specific constraints linked to very-deep water and AUV mounting. Power electronics and impedance matching unit have been specifically optimised to deliver a sound level of 190 dB (ref. 1 µPa @ 1 m), with 48 VDC supply voltage and 250 W available electric power. The receiving part is made up of a three-hydrophone array with a loss of sensitivity lower than 1 dB between 0 and 600 bar. This ultra-deep light system has been mounted on an IFREMER's AUV and the first results at sea are presented and discussed.
PY 2008
PD JUN
ID 23836
ER

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