Acoustic wave transducer and sonar antenna with improved...

B - Operations – Transporting – 06 – B

Patent

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Details

B06B 1/06 (2006.01)

Patent

CA 2748383

The invention relates to an acoustic wave transducer that includes at least one electroacoustic motor (1, 21), a flare (4, 24) having an inner wall and an outer wall, a counterweight (5), and a hollow housing (8, 28) having an inner wall and an outer wall and at least one acoustic opening. The electroacoustic motor is connected to the flare (4, 24) as well as to the counterweight (5) along an axis (7), and said electroacoustic motor (1, 21) is capable of exciting the flare at about at least one resonance frequency f. The housing (8, 28) is connected to the counterweight (5) and surrounds the motor (1, 21) and the flare (4, 24), the outer wall of the flare being arranged opposite an acoustic opening of the housing, and the space between the inner wall of the housing and the inner wall of the flare defines a cavity that contains a fluid. According to the invention, said transducer includes acoustic attenuation means connected to the outer wall of the housing in order to attenuate the transmission and/or reception acoustic waves at the frequency f at least in a direction transverse to the transmission/reception axis. The invention also relates to a sonar antenna that comprises at least one transducer according to the invention.

La présente invention concerne un transducteur d'ondes acoustiques comprenant au moins un moteur électro-acoustique (1, 21), un pavillon (4, 24) ayant une paroi interne et une paroi externe, une contremasse (5), et un boîtier (8, 28) creux ayant une paroi interne et une paroi externe et au moins une ouverture acoustique. Le moteur électro-acoustique est relié d'une part au pavillon (4, 24) et d'autre part à la contremasse (5) suivant un axe (7) et ledit moteur électro-acoustique (1, 21) est apte à exciter le pavillon autour d'au moins une fréquence de résonance acoustique f. Ledit boîtier (8, 28) est relié à la contremasse (5) et entoure le moteur (1, 21) et le pavillon (4, 24), la paroi externe du pavillon étant placée en face d'une ouverture acoustique du boîtier, et l'espace entre la paroi interne du boîtier et la paroi interne du pavillon formant une cavité comprenant un fluide. Selon l'invention, ledit transducteur comprend des moyens acoustiques d'atténuation solidaires d'une paroi externe du boîtier pour atténuer les ondes acoustiques en émission et/ou en réception à la fréquence f dans au moins une direction transverse à l'axe d'émission/réception. L'invention concerne également une antenne sonar comprenant au moins un transducteur selon l'invention.

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