Audible sound metamaterial

被引：18

作者：

Ding Chang-Lin ^{[1
]}

Zhao Xiao-Peng ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Dept Appl Phys, Xian 710129, Peoples R China

来源：

ACTA PHYSICA SINICA | 2009年 / 58卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Helmholtz resonators; ATLM; transmission dip; effective modulus; LEFT-HANDED METAMATERIALS; ACOUSTIC-WAVES; NEGATIVE PERMEABILITY; REFRACTION;

D O I：

10.7498/aps.58.6351

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We fabricated a kind of 1D metamaterial. which consists of periodic array of Helmholtz resonators and tested its acoustic transmission at audible sound frequency in air. The experimental results show that a transmission dip appears at the frequency range of 2.1-3.5 kHz. The transmission ratio simulated by acoustic transmission line method (ATLM) is in accordance with the experimental results. From the effective impedance calculated by ATLM, the transmission dip is ascribed to the backward wave reflection of HRs'resonance. Furthermore, the transmission pressure distribution measurement of the inner sample clearly demonstrates the resonance effect in the metamaterial, in which there is an out-of-phase response to the driving field. The value of effective modulus is calculated to be negative based on the resonant model mentioned before.

引用

页码：6351 / 6355

页数：5

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