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Boris Aronov

David A Brown

Corey Lionel Bachand

Methods and transducers for producing acoustical signals having a spiral wavefront with omnidirectional magnitude and a phase that varies with angle and transducers for producing broadband omnidirectional reference signals for underwater navigation and communication.

Acoustic transducers for underwater navigation and communication

An efficient, broadband, underwater acoustic transducer having nominally a quasi-omnidirectional radiation pattern is realized with a plurality of thin walled radially vibrating hollow spherical piezoelectric transduction elements aligned axially. Each spherical transduction element is progressively smaller in diameter so as to enhance the combined frequency coverage and achieve the desirable radiation pattern. The transduction elements may be excited individually, or together electrically in series or in parallel combinations.

Broadband underwater acoustic transducer

The present invention relates to a directional electro-acoustic transducer and arrays of transducers of the cylindrical or ring electro-mechanical type in conjunction with a partial conformal acoustic baffle. Such a device has very desirable directional beam patterns that are nearly frequency independent over a significant frequency range and the radiation is has a characteristic broadband frequency response due to multimode excitation.

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Needam, MA, United States of America

Boris Aronov