面向穿戴式脑电系统的主动干电极传感器

发布时间：2018-03-23 09:41

  本文选题：脑-机接口(BCI)　切入点：主动干电极　出处：《仪表技术与传感器》2017年02期 　论文类型：期刊论文

【摘要】：在传统的脑电系统中,脑电信号采集使用的是湿电极,需要配合导电膏使用,糊状的导电膏无论是使用前的逐个注入和使用后的清洗,都使得湿电极的使用不便。文中设计并实现了一种不需要涂覆导电膏、可直接佩戴的带有前置放大电路的爪式干电极传感器,可用于穿戴式脑电辅助康复系统。和湿电极相比,这种电极安放简便快捷,尽管其接触阻抗稍高,但通过主动前置放大器的引入,有效地降低了等效接触阻抗,改善了电极的信噪比,提高了电极抵抗运动及工频干扰的能力。经过实际的脑电信号采集实验比对,主动干电极表现出良好的记录特性,与商用标准头皮湿电极采集的脑电信号的相关系数是0.89;信噪比与商用湿电极接近(在3 d B附近),比没有采用主动放大电路的干电极高10 d B以上。
[Abstract]:In the traditional EEG system, EEG signals are collected with wet electrodes, which need to be used in conjunction with conductive ointment. The paste is injected one by one before use and cleaned after use. In this paper, a claw type dry electrode sensor with preamplifier circuit is designed and realized, which can be used in wearable EEG assisted rehabilitation system. Compared with wet electrode, this paper designs and implements a kind of claw type dry electrode sensor, which can be worn directly without coated conductive paste, and can be used in wearable EEG assisted rehabilitation system. Although the contact impedance of the electrode is a little high, the equivalent contact impedance is effectively reduced and the SNR of the electrode is improved by the introduction of the active preamplifier. It improves the ability of electrode to resist motion and interference of power frequency. The active dry electrode shows good recording characteristics after comparing with the actual EEG acquisition experiment. The correlation coefficient of EEG with commercial standard scalp wet electrode is 0.89, and SNR is close to that of commercial wet electrode (near 3 dB, which is more than 10 dB higher than that of dry electrode without active amplification circuit).
【作者单位】： 中国科学院半导体研究所集成光电子学国家重点联合实验室脑科学与智能技术卓越创新中心;
【基金】：国家自然科学基金(61335010;61275200;61275145) 第十一批“千人计划”青年项目资助
【分类号】：TP212
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本文编号：1652899