Acoustic wave transducer and sonar antenna with improved directivity
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United States of America Patent
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Jul 15, 2014
Grant Date -
Oct 20, 2011
app pub date -
Dec 23, 2009
filing date -
Dec 23, 2008
priority date (Note) -
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Abstract
An acoustic wave transducer includes at least one electroacoustic motor, a horn having an inner wall and an outer wall, a counterweight, and a hollow housing having an inner wall and an outer wall and at least one acoustic opening. The electroacoustic motor is connected to the horn and to the counterweight along an axis, and the electroacoustic motor is capable of exciting the horn at about at least one resonance frequency. The housing is connected to the counterweight and surrounds the motor and the horn, the outer wall of the horn 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 horn defines a cavity that contains a fluid. The transducer includes acoustic attenuation elements connected to the outer wall of the housing in order to attenuate the emission and/or reception acoustic waves at the frequency at least in a direction transverse to the emission/reception axis. A sonar antenna that includes at least one transducer is also described.
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