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Fractal acoustic metamaterial based broadband acoustic focusing lens and preparation method thereof

A technology of acoustic metamaterials and focusing lenses, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of unit design impedance matching, low absorption working bandwidth, etc., achieve excellent performance, improve the refractive index, and the effect of simple and fast preparation method

Active Publication Date: 2016-12-14
SOUTHEAST UNIV
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Problems solved by technology

These structures can be used to design some specific parameters, such as low absorption and wide operating bandwidth, but there are also impedance matching challenges in cell design

Method used

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  • Fractal acoustic metamaterial based broadband acoustic focusing lens and preparation method thereof
  • Fractal acoustic metamaterial based broadband acoustic focusing lens and preparation method thereof
  • Fractal acoustic metamaterial based broadband acoustic focusing lens and preparation method thereof

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Embodiment Construction

[0039] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0040] The broadband acoustic focusing lens based on fractal acoustic metamaterial of the present invention, such as figure 1 , the broadband acoustic focusing lens includes a fractal structural unit array 2 and a base material 1, the fractal structural unit array 2 is located on the base material 1, and is used to simulate the refractive index of each refraction point of the acoustic focusing lens, and the base material 1 is used to support the fractal Structural cell array2.

[0041] The fractal structural unit array 2 is composed of a plurality of fractal periodic units, and each fractal periodic unit corresponds to a refraction point of the focusing lens. Each fractal period unit has the same period size U, which is determined according to the working frequency range of the focusing lens using the method of equivalent medium theory.

[0...

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Abstract

The invention discloses a fractal acoustic metamaterial based broadband acoustic focusing lens and a preparation method thereof. The broadband acoustic focusing lens comprises a base material and a fractal structure unit array located on the base material. The fractal structure unit array is formed by arranging a plurality of fractal periodic units, and each fractal periodic unit corresponds to a refraction point of the focusing lens. The fractal period unit comprises a fractal unit and air, and a refractive index of the fractal unit corresponding to any refraction point conforms to a theoretical refractive index of the refraction point. According to the invention, the fractal units are adopted for the first time to form the acoustic focusing lens, thereby providing a new way for designing a new material for the acoustic engineering. The actual path length of spreading of acoustic waves in a unit structure is increased in a fractal mode, and the refractive index of the unit structure is improved. The acoustic focusing lens disclosed by the invention has a broadband characteristic, and can realize a good focusing effect of the acoustic waves in the scope of a broad band.

Description

technical field [0001] The invention relates to a focusing lens and a preparation method thereof, in particular to a broadband acoustic focusing lens based on fractal acoustic metamaterials and a preparation method thereof. Background technique [0002] With the in-depth theoretical research and application development of new artificial electromagnetic materials, the application of metamaterials in the field of acoustics has also aroused the interest of many researchers. The similar correspondence between metamaterials in acoustics and electromagnetism has been confirmed in previous studies, and the possibility of extending the concept of metamaterials to the acoustic band is also being studied by experts in this field. Based on the previous research on metamaterials in acoustics, the unit structure can also obtain unnatural parameter properties in the acoustic wave band, such as double negative properties (negative density and negative elastic modulus), zero refractive inde...

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Application Information

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IPC IPC(8): G10K11/30
CPCG10K11/30
Inventor 程强宋刚永黄蓓董慧媛崔铁军
Owner SOUTHEAST UNIV
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