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Title: Broadband unidirectional ultrasound propagation

A passive, linear arrangement of a sonic crystal-based apparatus and method including a 1D sonic crystal, a nonlinear medium, and an acoustic low-pass filter, for permitting unidirectional broadband ultrasound propagation as a collimated beam for underwater, air or other fluid communication, are described. The signal to be transmitted is first used to modulate a high-frequency ultrasonic carrier wave which is directed into the sonic crystal side of the apparatus. The apparatus processes the modulated signal, whereby the original low-frequency signal exits the apparatus as a collimated beam on the side of the apparatus opposite the sonic crystal. The sonic crystal provides a bandpass acoustic filter through which the modulated high-frequency ultrasonic signal passes, and the nonlinear medium demodulates the modulated signal and recovers the low-frequency sound beam. The low-pass filter removes remaining high-frequency components, and contributes to the unidirectional property of the apparatus.
Inventors:
;
Issue Date:
OSTI Identifier:
1413192
Assignee:
U.S. Department of Energy (Washington, DC) LANL
Patent Number(s):
9,843,400
Application Number:
14/680,031
Contract Number:
AC52-06NA25396
Resource Relation:
Patent File Date: 2015 Apr 06
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Other works cited in this record:

Sampling modulated waves
patent, December 1979

Directional loudspeaker system
patent, April 1989

Acoustic sub-surface interrogator
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Low loss wide bandwidth parallel channel acoustic filter
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Non-acoustic self noise canceller for sensor arrays
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Parametric sound system with lower sideband
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Method And System For Generating A Beam Of Acoustic Energy From A Borehole, And Applications Thereof
patent-application, December 2009

Device And Method For Generating A Beam Of Acoustic Energy From A Borehole, And Applications Thereof
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Acoustic Diode
patent-application, July 2012

Broadband Unidirectional Ultrasound Propagation
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