Ultra-thin Schroder scatterer

A scatterer and ultra-thin technology, applied in the field of acoustics, can solve problems such as unfavorable integration of acoustic devices, and achieve the effect of reducing thickness and facilitating use

Active Publication Date: 2016-08-31
NANJING UNIV
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Problems solved by technology

[0002] The traditional Schroeder acoustic structure is provided with multiple grooves, and the width of the notch and the bottom of the groove are the same, resulting in a relatively thick Schroeder acoustic structure, generally λ / 2, such as figure 1 and figure 2 As shown, it is not conducive to the integration of acoustic devices

Method used

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] like image 3 and Figure 4 As shown, the ultra-thin Schroeder unit is an ultra-thin acoustic groove unit, the thickness is only λ / 20, and the width is the same as that of the traditional Schroeder groove. The groove structure is as follows Figure 4 As shown, the neck opening and the groove bottom have different widths, the width of the neck opening is w, and the width of the groove bottom is 0.48λ. The resonance effect of the acoustic groove unit is used to produce the same acoustic properties as the traditional groove structure, and the realization is the same as that of the traditional groove structure. Schroeder scatterers have a similar effect. Therefore, the phase feedback of the groove we designed on the surface should satisfy:

[0018] φ n , m = ...

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Abstract

Disclosed in the invention is an ultra-thin Schroder scatterer comprising a substrate. Square grooves arranged at 7*p rows and 7*q columns are formed in the substrate, wherein the p and q are integers larger than or equal to 1; and the length of side of each square groove is 0.48 lambda and the depth of each groove is 0.04 lambda. The grooves are provided with square necks; the side length of each square neck is smaller than that of the square groove and the depth of the neck is 0.01 lambda, wherein the lambda is a corresponding wavelength, for a certain central frequency f0 design, of the scatterer. The neck width w of different groove units are different and the distribution meets a specific sequence of number. According to the invention, diffuse reflection of acoustic waves can be realized at a broadband. Compared with the traditional Schroder scatterer, the provided ultra-thin Schroder scatterer has a closer diffuse reflection effect. Meanwhile, the material thickness can be reduced. Compared with the traditional Schroder unit having the thickness of lambda/2, the provided Schroder scatterer has the thickness of lambda/20, so that the Schroder scatterer can be used conveniently in practice.

Description

technical field [0001] The invention relates to an ultrathin Schroeder scatterer, which belongs to the field of acoustics. Background technique [0002] The traditional Schroeder acoustic structure is provided with multiple grooves, and the width of the notch and the bottom of the groove are the same, resulting in a relatively thick Schroeder acoustic structure, generally λ / 2, such as figure 1 and figure 2 As shown, it is not conducive to the integration of acoustic devices. Contents of the invention [0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an ultra-thin Schroeder scatterer, the thickness of which can be 1 / 10 of the traditional Schroeder scatterer, and the volume is smaller. [0004] Technical solution: In order to achieve the above object, an ultra-thin Schroeder scatterer of the present invention includes a substrate, and the substrate is provided with 7×p rows and 7×q columns of square g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/20
CPCG10K11/20G10K11/28
Inventor 梁彬景云朱一凡邹欣晔杨京范旭东程建春
Owner NANJING UNIV
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