文献类型：期刊文献

英文题名：Piezoelectret-based dual-mode flexible pressure sensor for accurate wrist pulse signal acquisition in health monitoring

作者：Gao, Tiantian[1];Qiu, Xunlin[1,2];Xu, Peng[1];Hu, Zheng[1,2];Yan, Jianjun[1];Xiang, Yanxun[1];Xuan, Fu-Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China;[2]Shanghai Inst Aircraft Mech & Control, 100 Zhangwu Rd, Shanghai 200092, Peoples R China

年份：2025

卷号：242

外文期刊名：MEASUREMENT

收录：;EI(收录号：20244817448055);WOS:【SCI-EXPANDED(收录号:WOS:001372604600001)】；

基金：Financial support from the National Natural Science Foundation of China (Nos. 12174102, 12025403 and 12304511) and Shanghai Gao-feng Project for University Academic Program Development is gratefully acknowledged.

语种：英文

外文关键词：Radial artery pulse; Health monitoring; Piezoelectric sensor; Piezoelectret; Wearable sensor

摘要：The development of flexible and wearable sensors for acquiring high-quality pulse signals has attracted much attention in recent years. Here, dual-mode pressure sensors capable of detecting both static force and dynamic pulse signals are achieved based on tubular-channel fluoroethylenepropylene (TCF) and cellular polypropylene (CPP) piezoelectrets with a d(33) coefficient of about 210 and 155 pC/N, respectively. Thanks to their high piezoelectric sensitivity, both piezoelectret sensors can effectively detect radial artery pulses. Moreover, due to their anisotropic foam structure, both piezoelectret sensors are highly compressible in the thickness direction, and therefore can be used as capacitive sensors. The TCF piezoelectret has a sensitivity of 0.01 kPa(-1) and 0.008 kPa(-1) within pressure ranges below about 5 kPa and above 25 kPa, while the CPP piezoelectret shows a sensitivity of 0.006 kPa(-1) and 0.0032 kPa(-1) for pressure ranges below 15 kPa and above 30 kPa, respectively. The capacitance of the piezoelectret sensors is taken for monitoring the static force applied on wrist to compress the radial artery. Our results show that the profile of the detected pulse signals strongly depends on the applied static force. Clear pulse signals with detailed information are detected at an optimal static force of 5 and 6 N for the TCF and CPP piezoelectret sensors, respectively. This work demonstrates that individual piezoelectret-based pressure sensors can be employed for the detection of both static (as capacitive sensors) and dynamic pressures (as piezoelectric sensors), exhibiting great application potential in flexible and wearable sensors used for accurate pulse signal acquisition.