Experimental Demonstration of a Multichannel Elastic Wave Filter in a Phononic Crystal Slab
Experimental Demonstration of a Multichannel Elastic Wave Filter in a Phononic Crystal Slab
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DOI：
10.3390/app10134594
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发表时间：
2020-07-01
影响因子：
2.7
通讯作者：
Khelif, Abdelkrim
中科院分区：
文献类型：
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作者：
Faiz, Mohd Syafiq;Addouche, Mahmoud;Khelif, Abdelkrim
为了选择感兴趣的特定频率并拒绝其他频率，在滤波应用的背景下研究了二维声子晶体板的波导和滤波特性。为此，我们设计并制造了一种金属设备，该设备由安装在板顶部的圆柱形柱的正方形网格组成，采用3D打印技术。利用有限元法、微系统分析仪和激光多普勒测振仪分别对器件的理论和实验特性进行了研究。该器件对0.3MHz左右的兰姆波具有完全带隙，相对带宽为30%。在声子晶体内部通过插入几个空间间隙来实现可定制的波导，以通过将声学信号分离到三个不同的带通频率通道来实现解复用效果。通过实验证明了解复用性能，抑制水平高达60 dB。所提出的声子平台可以在信号处理以及用于生物应用的液滴操纵中产生显著影响。
With the aim of selecting particular frequencies of interest and rejecting others, the waveguiding and filtering properties of a two-dimensional phononic crystal slab are investigated in the context of a filtering application. To this end, we designed and manufactured a metallic device that consists of a square lattice of cylindrical pillars mounted on the top of a plate by using 3D printing technology. We respectively explored the theoretical and experimental characteristics of the device by using finite element method, a Micro System Analyzer (MSA) and a scanning laser Doppler vibrometer. The proposed device shows a complete band gap for Lamb wave around 0.3 MHz with a relative band-width of30%. Tailorable waveguides are realized inside this phononic crystal by inserting several space gaps to achieve a demultiplexing effect through the splitting of an acoustic signal towards three different bandpass frequency channels. The demultiplexing performance has been experimentally demonstrated by achieving rejection levels up to 60 dB. The proposed phononic platform can have a significant impact in signal processing as well as droplet manipulation for biological applications.