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

Flexible and wearable sensors are highly desired for health monitoring, agriculture, sport, indoor positioning systems applications. However, the currently developed wireless sensors, which communicated through radio signals, can only provide limited accuracy often ineffective in underwater conditions. In this paper, a platform based on flexible piezoelectric acoustics is with multiple functions of sensing, communication, positioning. Under high frequency (≈13 MHz) stimulation, Lamb waves generated respiratory monitoring. Whereas under low-frequency stimulation (≈20 kHz), device agitated as vibrating membrane, be implemented communication Indoor demonstrated within 2.8 m at 200 bps or 4.2 25 bps. combination sensing function, real-time monitoring achieved simultaneously. The distance measurement phase differences transmitted received acoustic signals range 100 cm, maximum error 3 cm. This study offers new insights into applications using wave devices, promising sensor networks.