相关实验视频

Updated: Jun 18, 2025

Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing

Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing

Published on: June 1, 2012

最小化皮肤和Ag/AgCl干电极之间的寄生能力

Sungcheol Hong¹, Gerard Coté^1,2,3

¹Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA.

|July 27, 2024

概括

干电极中的寄生电容导致不稳定的生物阻抗信号. 将电容添加到干电极上可以显著提高信号稳定性和性能,使它们与脉冲波监测的湿电极相比.

科学领域:

生物医学工程生物医学工程
信号处理信号处理
可穿戴技术可穿戴技术

背景情况:

用于生物阻抗监测的干电极由于皮肤电极接口上的寄生电容导致信号不稳定.
传统的湿电极使用凝来减轻电容,但具有诸如有限的可重复使用性和潜在的皮肤刺激等缺点.
由于信号不稳定,干电极在服务不足的地区的成本效益再利用受到阻碍.

研究的目的:

开发一种方法来中和干电极中的寄生电容,以进行稳定的生物阻抗测量.
通过减轻皮肤容量来提高脉冲波监测干电极的性能.
为生物阻抗应用提供一种成本效益高且可重复使用的湿电极替代品.

主要方法:

使用高频结构模拟器 (HFSS) 模拟生物阻抗电路的寄生电容.
研究了与干电极并行添加高值电容器 (100 pF到1 μF) 的效果.
在经过修改的干电极和传统的湿电极之间进行了体内比较分析.

主要成果:

与标准干电极相比,实现了8.2dB更高的信号噪声比 (SNR).
添加1μF电容器的性能与湿电极相当,仅减少0.4dB.
通过电容器集成,证明了对寄生虫和皮肤电容的有效缓解.

结论:

添加电容器到干电极有效中和寄生电容,使稳定的生物阻抗脉冲波监测.
拟议的方法提供了与湿电极可比的性能,为成本敏感的应用提供了可行的替代方案.
这种基于电容器的方法有可能改善生物阻抗传感中的各种干电极应用.

关键词:

在Ag/AgCl电极上在HFSS模拟中使用HFSS模拟.动脉脉动脉的信号动脉脉的信号生物阻抗是一种生物阻抗.进行比较分析.电心电图 (ECG) 是一种心电图.寄生式电容器的寄生式电容器皮肤接口皮肤接口

更多相关视频

Fabrication of Thin Film Silver/Silver Chloride Electrodes with Finely Controlled Single Layer Silver Chloride

Fabrication of Thin Film Silver/Silver Chloride Electrodes with Finely Controlled Single Layer Silver Chloride

Published on: July 1, 2020

Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing

Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing

Published on: March 17, 2023

相关概念视频

Capacitors and Capacitance

Capacitors and Capacitance

A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
When the conductors are two identical parallel plates, it is called a parallel plate capacitor. When battery terminals are...

Capacitor With A Dielectric

Capacitor With A Dielectric

Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...

MOS Capacitor

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...