Graphene acoustic transducers based on electromagnetic interactions

• Published in: Ultrasonics 2021-07, Vol.114, p.106420-106420, Article 106420
• Main Authors: Guo, Xinhua, An, Jiabao, Wu, Huachun, Cai, Zhenhua, Wang, Pan
• Format: Article
• Language: English
• Subjects: Acoustic transducer; Electromagnetic; Graphene; High radiation performance; Sensitivity
• ISSN: 0041-624X; 1874-9968
• DOI: 10.1016/j.ultras.2021.106420

•A graphene acoustic transducer is proposed with an excitation component of a coil.•Driven by electrostatic and electromagnetic excitation.•The transducer with high sensitivity and radiation performance.•Potential for applications with high performance requirements. 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.