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Multifunctional and Wearable Patches Based on Flexible Piezoelectric Acoustics for Integrated Sensing,Localization, and Underwater Communication |
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| Authors: | Qian Zhang Yong Wang Dongsheng Li Jin Xie Kai Tao PingAn Hu Jian Zhou Honglong Chang Yongqing Fu |
| Affiliation: | 1. The State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou, 310027 P. R. China
Faculty of Engineering and Environment, University of Northumbria, Newcastle upon Tyne, NE1 8ST UK;2. Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University, Hangzhou, 310024 P. R. China Faculty of Engineering and Environment, University of Northumbria, Newcastle upon Tyne, NE1 8ST UK;3. The State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou, 310027 P. R. China;4. Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace, Northwestern Polytechnical University, Xi'an, 710072 P. R. China;5. MOE Key Lab of Micro-System and Micro-Structures Manufacturing, Harbin Institute of Technology, Harbin, 150080 P. R. China;6. College of Mechanical and Vehicle Engineering, Hunan University, Changsha, 410082 P.R. China;7. Faculty of Engineering and Environment, University of Northumbria, Newcastle upon Tyne, NE1 8ST UK |
| Abstract: | Flexible and wearable sensors are highly desired for health monitoring, agriculture, sport, and indoor positioning systems applications. However, the currently developed wireless wearable sensors, which are communicated through radio signals, can only provide limited positioning accuracy and are often ineffective in underwater conditions. In this paper, a wireless platform based on flexible piezoelectric acoustics is developed with multiple functions of sensing, communication, and positioning. Under a high frequency (≈13 MHz) stimulation, Lamb waves are generated for respiratory monitoring. Whereas under low-frequency stimulation (≈20 kHz), this device is agitated as a vibrating membrane, which can be implemented for communication and positioning applications. Indoor communication is demonstrated within 2.8 m at 200 bps or 4.2 m at 25 bps. In combination with the sensing function, real-time respiratory monitoring and wireless communication are achieved simultaneously. The distance measurement is achieved based on the phase differences of transmitted and received acoustic signals within a range of 100 cm, with a maximum error of 3 cm. This study offers new insights into the communication and positioning applications using flexible acoustic wave devices, which are promising for wireless and wearable sensor networks. |
| Keywords: | acoustic communication acoustic waves flexible devices indoor positioning respiratory monitoring smart wireless sensors wearable sensors |