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US 11,308,931 B2Granted
Acoustic metamaterial
AssigneeThe Research Foundation for The State University of New York
InventorSteven M. Hoffberg
Life of this patent
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Abstract
A metamaterial comprising, a plurality of acoustic vector field sensors, each configured to sense an acoustic vector field of a fluid within a fluid-filled space in response to fluid waves, and producing an electrical signal corresponding to the sensed acoustic vector field; a processor configured to perform a time and space transform on the electrical signal; and at least one phased array transducer, configured to emit fluid waves according to a produced acoustic vector field pattern dependent on a result of the time and space transform, a within a portion of the fluid.
Claims20
A metamaterial, comprising:
- a plurality of vector flow sensors, each of the vector flow sensors comprising at least one displaceable conductive sensing fiber and being configured to sense a vector flow of a gas due to primary acoustic waves within a first portion of the gas past the at least one displaceable conductive sensing fiber by quantifying a displacement of the at least one displaceable conductive sensing fiber due to the vector flow of the gas, wherein the at least one displaceable conductive sensing fiber is suspended in a magnetic field, and transduces the displacement to an electromagnetically induced voltage corresponding to the primary acoustic waves;
- a transducer array comprising a plurality of acoustic wave emitters, configured to emit secondary acoustic waves within a second portion of the gas, the first portion of the gas and the second portion of the gas being separated by an intervening physical structure therebetween that interferes with propagation of the primary acoustic waves surrounding the intervening physical structure;
- and
- an automated control comprising an automated transform processor, configured to:
- receive an electrical signal corresponding to the electromagnetically induced voltage responsive to the sensed primary acoustic waves from the plurality of vector flow sensors;
- perform a time and space transform having a metamaterial approximation transfer function on the electrical signal;
- determine a vector flow pattern of the primary acoustic waves;
- and
- control the transducer array in accordance with a result of the time and space transform having the metamaterial approximation transfer function, to emit the secondary acoustic waves which at least partially cancel the primary acoustic waves.
6 more elements
A metamaterial method, comprising:
- providing a metamaterial comprising:
- a plurality of vector flow sensors, each of the vector flow sensors comprising at least one displaceable conductive sensing fiber suspended in a magnetic field, and being configured to sense a flow of a gas in response to primary acoustic waves past the at least one displaceable conductive sensing fiber by quantifying a displacement of the at least one displaceable conductive sensing fiber due to the flow of the gas, producing an electromagnetically induced voltage corresponding to the primary acoustic waves;
- a transducer array;
- and
- an intervening physical structure, disposed between the plurality of vector flow sensors and the transducer array, that interferes with propagation of the primary acoustic waves surrounding the intervening physical structure;
- the metamaterial method further comprising:
- receiving, by an automated transform processor, an electrical signal corresponding to the electromagnetically induced voltage responsive to the movement of the gas from the plurality of vector flow sensors;
- performing a time and space transform having an approximated metamaterial transfer function on the electrical signal with the automated transform processor, to determine a pattern of gas movement;
- and
- emitting secondary acoustic waves within a portion of the gas with the transducer array comprising a plurality of acoustic wave emitters, responsive to a result of the time and space transform having the approximated metamaterial transfer function from the automated transform processor,
- to at least partially cancel the primary acoustic waves proximate to the metamaterial with the emitted secondary waves.
8 more elements
A non-transitory computer readable medium containing instructions for controlling an automated processor to implement an active metamaterial control system for controlling a metamaterial, the metamaterial comprising:
- a plurality of acoustic wave propagation vector flow sensors, each of the acoustic wave propagation vector flow sensors comprising a displaceable conductive sensing fiber suspended in a magnetic field, which are responsive to a viscous drag of a gas flow from a primary acoustic wave propagating in a gas on the respective displaceable conductive sensing fiber, configured to electromagnetically induce a voltage upon a displacement;
- a phased array transducer;
- and
- an intervening physical structure separating the plurality of acoustic wave propagation vector flow sensors and the phased array transducer, the intervening physical structure interfering with the propagation of the primary acoustic wave between the plurality of acoustic wave propagation vector flow sensors and the phased array transducer,
- the instructions comprising:
- instructions to receive electrical signals corresponding to the electromagnetically-induced voltage from the plurality of acoustic wave propagation vector flow sensors responsive to the primary acoustic wave;
- instructions to perform a time and space transform having an approximated metamaterial transfer function on the electrical signals;
- and
- instructions to control the phased array transducer to emit secondary acoustic waves within a portion of the gas, responsive to a result of the time and space transform having the approximated metamaterial transfer function, to at least partially cancel the primary acoustic wave.
6 more elements
Dependencies are inferred from the claim text.