Abating low-frequency noise using encapsulated gas bubbles

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Date

2014-04-08

Authors

Preston S. Wilson
Kevin M. Lee
Mark S. Wochner

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United States Patent and Trademark Office

Abstract

Air bubbles may be used to reduce radiated underwater noise. Two modalities of sound attenuation by air bubbles were shown to provide a reduction in radiated sound: bubble acoustic resonance damping and acoustic impedance mismatching. The bubbles used for acoustic resonance damping were manifested using gas-filled containers coupled to a support, and the acoustic impedance mismatching bubbles were created using a cloud of freely-rising bubbles, which were both used to surround an underwater sound source.

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