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Acoustic supersurface structure and sound vortex wave generator

An acoustic metasurface, fan-shaped technology, applied in the field of acoustic waves, can solve problems such as the inability to achieve plane wave acoustic vortex wave propagation

Active Publication Date: 2019-07-12
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Acoustic vortex wave generators in the prior art usually use conventional acoustic metasurface units, which can only realize the propagation of acoustic vortex waves from plane waves to integer topological charges, and cannot realize the propagation of acoustic vortex waves from plane waves to fractional topological charges. Propagation of Vortex Waves

Method used

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  • Acoustic supersurface structure and sound vortex wave generator

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Embodiment Construction

[0025] The embodiment of the present invention provides an acoustic metasurface structure and an acoustic vortex wave generator, which can convert a plane wave to an acoustic vortex wave whose topological charge is a fraction during use, which is conducive to meeting user needs and has a simple structure , High transmittance.

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] Please...

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Abstract

The invention discloses an acoustic supersurface structure and a sound vortex wave generator. The acoustic supersurface structure comprises a cylinder-shaped supercell, the cylinder-shaped supercell comprises N fan-shaped supercell units intersected to the central axis of the cylinder-shaped supercell, the plurality of fan-shaped supercell units are distributed according to the preset sequence, the refractive index of each fan-shaped supercell unit is set according to a preset rule, so that the phases corresponding to the fan-shaped supercell units are sequentially increased according to the preset sequence, and the phase difference between each two adjacent fan-shaped supercell units is mpi / N, wherein m is an odd number greater than 1, and N is not smaller than 3. During the use process,the converting from plane wave to sound vortex wave with the topology charge number being a fraction can be realized, then the demands of a user can be satisfied, in addition, the structure is simple,and the transmittance is high.

Description

technical field [0001] Embodiments of the present invention relate to the field of acoustic wave technology, in particular to an acoustic metasurface structure and an acoustic vortex wave generator. Background technique [0002] With the development of science and technology, the application of sound waves is becoming more and more extensive. In the acoustic vortex field, the sound wave will twist and move along its axis in the process of traveling, forming a shape similar to a corkscrew. This twist will cause the superposition and cancellation of waves on the axis to form a center with zero field strength. Acoustic vortex generators convert plane waves into vortex beams whose propagation phases vary helically about the zero-field center. [0003] Acoustic vortex wave generators in the prior art usually use conventional acoustic metasurface units, which can only realize the propagation of acoustic vortex waves from plane waves to integer topological charges, and cannot real...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/18G10K11/36
CPCG10K11/36G10K11/18
Inventor 吴福根夏明张欣姚源卫刘月嫦王立诚
Owner GUANGDONG UNIV OF TECH
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