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A metamaterial for acoustic holography based on phase-amplitude modulation

A technology of amplitude modulation and metamaterials, applied in the field of metamaterials

Active Publication Date: 2018-05-04
NANJING UNIV
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  • Application Information

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Problems solved by technology

Acoustic holography is similar to optics in that it needs to modulate the phase and amplitude of the wave at the same time, while traditional acoustic metamaterials or metasurfaces often only adjust the phase of the acoustic wave

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  • A metamaterial for acoustic holography based on phase-amplitude modulation
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  • A metamaterial for acoustic holography based on phase-amplitude modulation

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Embodiment Construction

[0017] Such as Figure 1 to Figure 4 As shown, a metamaterial capable of realizing acoustic holography based on phase amplitude modulation of the present invention includes a substrate 1, the acoustic impedance of the substrate 1 is at least 100 times the acoustic impedance of air, and the substrate 1 is provided with n ×m units penetrating the substrate 1, n represents n rows, n is a positive integer, m represents m columns, and m is a positive integer, the present invention is preferably m=n=19, the units in the substrate 1 are uniformly distributed, and two adjacent The distance between the central positions of each unit is p=λ / 4, and each unit comprises a coaxial first outer channel, an intermediate channel and a second outer channel, and the intermediate channel is located between the first outer channel and the second outer channel, The cross-sectional shapes of the first outer channel, the middle channel and the second outer channel are all square, and the side lengths ...

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Abstract

The invention discloses a metamaterial capable of realizing acoustic holography based on phase amplitude modulation. The metamaterial includes a substrate, n*m substrate-penetrating units are arranged on the substrate, n represents n columns and is a positive integer, m represents m rows and is a positive integer, each unit includes a first external channel, a middle channel, and a second external channel that are coaxial, the cross sections of the first external channel, the middle channel, and the second external channel are square in shape, the edge length of the cross sections of the first external channel and the second external channel is lambda / 5, the edge length of the cross section of the middle external channel is in the range of 0-lambda / 5, the thickness of the substrate is lambda, the height of the first external channel is in the range of lambda / 10-3lambda / 5, and the lambda represents the wavelength of the incident sound wave. According to the invention, the inner radius of the middle channel changes in the range of 0-lambda / 5 to realize different reflection amplitude, the position of the middle channel is changed to realize different reflection phase, and meanwhile, the wave phase and amplitude can be modulated for acoustic holography imaging.

Description

technical field [0001] The invention relates to a metamaterial capable of realizing acoustic holography based on phase amplitude modulation, and belongs to the field of acoustics. Background technique [0002] Optical holographic imaging is a well-known technology. Acoustic holographic imaging is analogous to optical holography, which can manipulate the sound field to form a preset shape on a specific imaging plane. This completely new technique may be used in the field of sound field redistribution, ultrasound therapy and architectural acoustics. Acoustic holography is similar to optics in that it needs to modulate the phase and amplitude of the wave at the same time, while traditional acoustic metamaterials or metasurfaces often only adjust the phase of the acoustic wave. Contents of the invention [0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a metamaterial based on phase-amplitude modulation th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H3/00
CPCG03H3/00
Inventor 梁彬祝雪峰朱一凡范旭东邹欣晔杨京程建春
Owner NANJING UNIV
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