基于有源干电极的便携式脑电采集系统  

Portable EEG Acquisition System Based On Active Dry Electrodes

作　　者：王世昕 贺庆[1] 王庭李 冯文辉 WANG Shixin;HE Qing;WANG Tingli;FENG Wenhui(School of Instrument Science and Optoelectronic Engineering,Beijing University of Information Technology,Beijing 100192,China)

机构地区：[1]北京信息科技大学仪器科学与光电工程学院,北京100192

出　　处：《传感器世界》2025年第2期9-13,共5页Sensor World

基　　金：国际科学组织联盟重点合作研究项目(No.ANSO-CR-KP-2022-10);国家自然科学基金面上项目(No.62075013)。

摘　　要：传统无源电极在采集脑电时受头皮高阻抗的影响,信号质量较差,为解决此问题,文章提出一种基于有源电极的便携式脑电采集系统,该系统在爪式氯化银干电极基础上增加有源跟随器,有效降低电极与头皮间阻抗。硬件方面采用ADS1299芯片采集处理脑电数据,ESP32微控制器负责数据传输;软件实现蓝牙数据传输和PC端的信号显示分析。测试结果表明,与普通无源电极相比,有源电极采集信号质量明显提高,基线稳定,信噪比高,采用标准测试条件验证系统效果,睁眼闭眼试验结果与实际脑电特征吻合。该系统采用低功耗设计,成本低,便携性能好,可实现长时间的脑电监测,满足脑机接口及神经疾病研究应用的需求。The paper proposes a portable EEG acquisition system based on active electrodes.When traditional passive electrodes collect EEG,they are affected by the high impedance of the scalp and have poor signal quality.To solve the problem,the system adds an active follower to the claw-type silver chloride dry electrode to effectively reduce the impedance between the electrode and the scalp.In terms of hardware,the ADS1299 chip is used to collect and process EEG data,and the ESP32 microcontroller is responsible for data transmission.The software implements wireless Bluetooth data transmission and signal display and analysis on the PC side.The test results show that compared with ordinary passive electrodes,the signal quality of active electrodes is significantly improved,the baseline is stable,and the signal-to-noise ratio is high.The system effect is verified using standard test conditions,and the results of the eyes-open and eyes-closed test are consistent with the actual EEG characteristics.The system adopts a low-power design,low cost,and good portability.It can achieve longterm EEG monitoring and meet the needs of brain-computer interface and neurological disease research and application.

关 键 词：脑机接口 有源电极 ADS1299 嵌入式 

分 类 号：TN42[电子电信—微电子学与固体电子学]