Focusing ultrasonic waves in a 2-D covered channel above the periodic array of Helmholtz resonators

被引:2
作者
Anh Hoang Vu [1 ]
Hwang, Young-In [1 ]
Kim, Hak-Joon [1 ]
Song, Sung-Jin [1 ]
机构
[1] Sungkyunkwan Univ, Sch Engn, 2066 Seobu Ro, Suwon, South Korea
基金
新加坡国家研究基金会;
关键词
Acoustic metamaterial; Focusing; Helmholtz resonators; 2-D covered channel; NEGATIVE REFRACTIVE-INDEX; METAMATERIALS; SUPERLENS; LENS;
D O I
10.1007/s12206-017-0909-3
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
This paper presents the numerical simulation and experiments on focusing low-frequency ultrasonic waves in a 2-D covered channel above acoustic metamaterials composed of the periodic array of Helmholtz resonators, in which the refractive index can be in a negative value. The 2-D channel above the acoustic metamaterials is covered by a plate to limit the area affected by the negative refractive index metamaterials. Ultrasonic waves propagated in the 2-D covered channel are found to be highly dependent on input frequency and the designed Helmholtz resonator structure, where its negative refractive index causes the focusing phenomenon in this channel. From the numerical simulation and experiments, an amplitude focus spot is observed in the peak-to-peak of the time domain signal and frequency response at 125 kHz by mapping a pressure field in the 2-D covered channel. Different focal points with several input frequencies are also identified. Our research demonstrates the possibility of applying the designed lens based on acoustic metamaterials to improve the focusing effect in ultrasonic testing.
引用
收藏
页码:4631 / 4636
页数:6
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