Passive metamaterial-based acoustic holograms in ultrasound energy transfer systems
Passive metamaterial-based acoustic holograms in ultrasound energy transfer systems
复制标题
超声能量传输系统中基于无源超材料的声全息图
DOI：
10.1117/12.2296741
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Shahab, Shima
中科院分区：
文献类型：
--
作者：
Bakhtiari Nejad, Marjan;Elnahhas, Ahmed;Hajj, Muhammad R.;Shahab, Shima
非接触式能量传输 (CET) 是一项在有线电气接触危险或不切实际的应用中特别相关的技术。此外，在更换电池不切实际或可能不是可行选择的应用中，它将增强低功耗传感器的开发、使用和可靠性。最近引起人们兴趣的一种 CET 方法是超声波能量传输，它基于压电接收器接收超声波频率的声波。在空间中对传输的声能进行图案化和聚焦是增强电力传输和本地充电传感器或设备的挑战之一。我们使用经过数学设计的基于无源超材料的声全息图，通过未聚焦的发射器有选择地为压电接收器阵列供电。声全息图用于在目标平面中创建多焦点压力图案，其中接收器位于焦点区域内。我们进行多物理场仿真，其中使用全息图通过波控制和操纵，使用单个发射器为具有任意二维空间模式的多个接收器供电。我们表明，被动声全息图创建的多焦点压力模式将增强大多数接收器的功率传输。
Contactless energy transfer (CET) is a technology that is particularly relevant in applications where wired electrical contact is dangerous or impractical. Furthermore, it would enhance the development, use, and reliability of low-power sensors in applications where changing batteries is not practical or may not be a viable option. One CET method that has recently attracted interest is the ultrasonic acoustic energy transfer, which is based on the reception of acoustic waves at ultrasonic frequencies by a piezoelectric receiver. Patterning and focusing the transmitted acoustic energy in space is one of the challenges for enhancing the power transmission and locally charging sensors or devices. We use a mathematically designed passive metamaterial-based acoustic hologram to selectively power an array of piezoelectric receivers using an unfocused transmitter. The acoustic hologram is employed to create a multifocal pressure pattern in the target plane where the receivers are located inside focal regions. We conduct multiphysics simulations in which a single transmitter is used to power multiple receivers with an arbitrary two-dimensional spatial pattern via wave controlling and manipulation, using the hologram. We show that the multi-focal pressure pattern created by the passive acoustic hologram will enhance the power transmission for most receivers.
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