基于电磁相互作用的石墨烯声学换能器。

Graphene acoustic transducers based on electromagnetic interactions.

作者信息

Guo Xinhua, An Jiabao, Wu Huachun, Cai Zhenhua, Wang Pan

机构信息

School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China; Hubei Provincial Engineering Technology Research Center for Magnetic Suspension, Wuhan University of Technology, Wuhan, China.

School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China.

出版信息

Ultrasonics. 2021 Jul;114:106420. doi: 10.1016/j.ultras.2021.106420. Epub 2021 Mar 10.

DOI:10.1016/j.ultras.2021.106420

PMID:33735758

Abstract

Graphene acoustic transducers have high sensitivity in receiving mode. However, they are used in transmitting mode with low radiation performance. A graphene acoustic transducer with high sensitivity and radiation performance is proposed in this study. The transducer is composed of graphene diaphragm, an insulating layer embedded in a copper planar coil, and a bottom layer plated with copper. The proposed capacitive transducer is driven by electrostatic and electromagnetic excitation. The sensitivity and radiation performance of the transducer are analyzed by transceiver theory and simulation models. The results demonstrate that the proposed capacitive transducer has excellent acoustic performance with sensitivity of -42 dB and the sound pressure level of 106 dB at 4 kHz with a 20-turn coil that is more than doubled compared without a copper coil. In addition, the radiation performance of the transducer is discussed by the coil parameters including coil turns and coil current, which can provide a theoretical basis for further experiments.

摘要

石墨烯声学换能器在接收模式下具有高灵敏度。然而，它们在发射模式下使用时辐射性能较低。本研究提出了一种具有高灵敏度和辐射性能的石墨烯声学换能器。该换能器由石墨烯振膜、嵌入铜平面线圈的绝缘层以及镀铜的底层组成。所提出的电容式换能器由静电和电磁激励驱动。通过收发器理论和仿真模型对换能器的灵敏度和辐射性能进行了分析。结果表明，所提出的电容式换能器具有优异的声学性能，在4kHz时灵敏度为-42dB，声压级为106dB，使用20匝线圈时比没有铜线圈时提高了一倍多。此外，通过包括线圈匝数和线圈电流在内的线圈参数对换能器的辐射性能进行了讨论，可为进一步的实验提供理论依据。