G - Physics – 01 – S
Patent
G - Physics
01
S
349/23
G01S 15/74 (2006.01) B63B 45/08 (2006.01) B63G 13/00 (2006.01) G01V 1/00 (2006.01)
Patent
CA 1154139
ELECTRO-ACOUSTIC DEVICE FOR THE UNDERWATER SIGNALLING AND IDENTIFICATION OF A VESSEL ABSTRACT OF THE DISCLOSURE The underwater signalling and identification device comprises an emitter having four submerged transducers (10 to 13) arranged to form a square and fitted in a water-tight case placed above an opening formed in the hull of a ship, and also comprises a transducer-control circuit designed to emit an identi- fication signal specific to the vessel and made up of a series of figures or letters in Morse code, the signal being emitted at at least one frequency selected as a function of the sound spectrum of the vessel and falling within the range of 4 to 6 kHz, the strength of emission of the signal being in accordance with the relationship LIs1 ? LIb1 + .DELTA.(dB), wherein LIs1 is the level of acoustic intensity converted to the unit of distance of the identification signal of mean frequency fs, wherein LIb1 is the level of acoustic intensity, to unit of distance, of the sound band centered on the frequency fb(Hz), resulting in the detection, at a great distance, of the vessel carrying the equipment, by its characteristic underwriter noise, in the ambient sea-bed noise, and .DELTA. is a parameter, the value of which is in decibels.
358175
Eberlin Philippe
Rossi Mario
Blanchut & Bertrand S.a.
Gowling Lafleur Henderson Llp
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