Acoustic resonance focusing lens and design method thereof

A technology of focusing lens and acoustic resonance, which is applied to lenses, optics, sound-producing instruments, etc., can solve the problems of few application occasions, complicated design methods, etc., and achieve the effects of low cost, simple production and use methods, and simple processing technology.
CN109119062AActive Publication Date: 2019-01-01ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2019-01-01

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Abstract

The invention discloses an acoustic resonance focusing lens and a design method thereof, which belong to the field of physical acoustics. The acoustic resonance focusing lens has an artificial periodic acoustic structure composed of a base body, a plurality of local resonance-type scatterer units and a base, wherein the base body material can be air and water, each scatterer unit is in a cruciformshape, cells in the resonance focusing lens are arranged periodically in the form of a square lattice, the peripheral contour of the lens main body presents a cuboid, and the main body is arranged onthe lens base. The basic principle of a photonic crystal local resonance cavity and acoustic wave negative refraction is used to design the acoustic resonance focusing lens, and compared with the existing acoustic focusing lens, the acoustic resonance focusing lens has a simple structure, is thinner in thickness and can achieve good acoustic wave focusing effects for planar waves and spherical waves in various media.
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Description

technical field

[0001] The invention relates to a design method of an acoustic resonance focusing lens, which belongs to the field of physical acoustics. Background technique

[0002] In 2000, J.B.Pendry proposed the idea of ​​using negative refraction to make optically perfect lenses. In 2008, Alexey Suckhovich first experimentally confirmed that negative refraction of ultrasonic waves exists in a two-dimensional prism-shaped phononic crystal, and the propagation direction of sound waves can be judged by the gradient change direction of the isofrequency diagram of the cell. This shows that the acoustic perfect lens can also be realized by using the phononic crystal and the principle of negative refraction, so as to realize the sound wave focusing. Acoustic perfect lenses and acoustic metalens have become research hotspots in the field of acoustic wave focusing since 2008. By 2015, Nadège Kaina1 published an article in the journal Nature, designing a single negative metama...

Claims

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