Multifunctional and Wearable Patches Based on Flexible Piezoelectric Acoustics for Integrated Sensing, Localization and Underwater Communication

Zhang, Qian, Wang, Yong, Li, Dongsheng, Xie, Jin, Tao, Kai, Hu, PingAn, Zhou, Jian, Chang, Honglong and Fu, Yong Qing (2023) Multifunctional and Wearable Patches Based on Flexible Piezoelectric Acoustics for Integrated Sensing, Localization and Underwater Communication. Advanced Functional Materials, 33 (2). p. 2209667. ISSN 1616-301X

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Abstract

Flexible and wearable sensors are highly desired for applications in health monitoring, agriculture, sport and indoor positioning systems. However, the currently developed wireless wearable sensors which are communicated through radio signals could only provide a 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 using this flexible platform, Lamb waves are generated for respiratory monitoring. Whereas under a low-frequency stimulation (~20 kHz), this device is agitated as a vibrating membrane, which can be implemented for communication and positioning applications. Indoor communication has been demonstrated within 2.8 m at 200 bps or within 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. Based on a trilateration method, the coordinate of a flexible device serving as a receiver can be estimated by measuring the distances from the receiver to three flexible devices which are served as transmitters with known coordinates. 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.

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