基于柔性压电薄膜的可穿戴脉搏传感器设计
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西安理工大学

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TP242.6

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国家重点研发计划项目(SQ2023YFB3200021);西安市科技计划项目高校院所科技人员服务企业项目(24GXFW0053)


Design of wearable pulse sensor based on flexible piezoelectric thin film
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    摘要:

    针对传统脉搏传感器存在的穿戴不适、携带不便以及精度不高等问题,本文设计一种基于P(VDF-TrFE)柔性压电薄膜的可穿戴脉搏传感器,旨在实现人体脉搏信号的连续检测,为心血管疾病的预防和治疗提供有力支持。首先,采用溶液流延法制备P(VDF-TrFE)柔性压电薄膜作为传感器基底,并利用丝网印刷技术在制备好的压电薄膜表面印刷导电电极,结合网状屏蔽层的设计制备方形传感器和圆形阵列传感器,用于脉搏信号采集性能的实验对比。其次,为了解决脉搏信号低频微弱且容易受到各种噪声干扰的问题,设计包含信号放大和信号滤波功能的精密信号调理电路,用于获取高保真和高清晰度的低噪声脉搏波信号。实验结果表明,所制备的P(VDF-TrFE) 薄膜具有良好的介电、压电和铁电性能,其中 值达到-25pC?N-1,能够提升传感器快速准确捕捉低频脉搏信号的能力,设计的柔性脉搏传感器相较于传统刚性传感器能够较好地贴合人体皮肤,提升无感佩戴体验,符合可穿戴性以及舒适性的要求。其中,圆形阵列式传感器能够检测到包含大部分生理特征点的连续脉搏波信号,相比于方形传感器具备更高的灵敏度和清晰度,检测性能更好。除此之外,设计的信号调理电路能够缓解50Hz工频干扰和高频噪声干扰,成功将平均峰值电压从0.069V放大至5.467V,显示出清晰稳定的脉搏波形并保留脉搏信号的主要特征,抑制噪声干扰的同时实现了对人体脉搏信号的高灵敏度、高稳定性和高准确性的采集。因此,本文设计的基于柔性压电薄膜的可穿戴脉搏传感器能够有效检测和采集人体脉搏波信号,可用于医疗健康监测和可穿戴设备研究领域,具有广阔的应用前景。

    Abstract:

    In response to the limitations of traditional pulse sensors such as discomfort, inconvenience in wearability, and low precision, this study presents the development of a wearable pulse sensor based on P(VDF-TrFE) flexible piezoelectric film. The objective is continuous monitoring of human pulse signals, aiming to offer robust support for cardiovascular disease prevention and treatment. Firstly, P(VDF-TrFE) flexible piezoelectric films were prepared using the solution casting method to serve as the sensor substrate. Conductive electrodes were then printed on the surface of these films using screen printing technology. Additionally, a mesh shielding layer was incorporated into the design, and both square and circular array sensors were fabricated. These sensors were used for experimental comparison to evaluate their pulse signal acquisition performance. Secondly, to counteract the challenge of low-frequency weak pulse signals vulnerable to various noise interferences, a precision signal conditioning circuit was designed, integrating signal amplification and filtering functions to achieve high-fidelity, low-noise pulse wave signals. Experimental results demonstrate excellent dielectric, piezoelectric, and ferroelectric properties in the prepared P(VDF-TrFE) films, with a value reaching -25pC?N-1, enhancing the sensor's ability to rapidly and accurately capture low-frequency pulse signals. The designed flexible pulse sensor significantly outperforms conventional rigid sensors by conforming more effectively to the contours of human skin, thereby enhancing the sensation-free wearing experience. This design not only meets but also exceeds the requirements for wearability and comfort, making it an ideal choice for continuous, unobtrusive health monitoring applications. Particularly, the circular array sensor exhibits higher sensitivity and clarity in detecting continuous pulse wave signals containing most physiological characteristic points compared to the square sensor, thus achieving superior detection performance. Moreover, the designed signal conditioning circuit effectively mitigates 50Hz power frequency interference and high-frequency noise interference, successfully amplifying the average peak voltage from 0.069V to 5.467V. This results in clear and stable pulse waveforms while retaining the main features of pulse signals. The system achieves high sensitivity, stability, and accuracy in acquiring human pulse signals while suppressing noise interference. Consequently, the wearable pulse sensor based on flexible piezoelectric films developed in this study holds promise for effective detection and acquisition of human pulse wave signals, with wide-ranging applications in medical health monitoring and wearable device research fields.

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  • 收稿日期:2024-03-26
  • 最后修改日期:2024-07-19
  • 录用日期:2024-07-22
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