摘要
该文提出了通过模拟电路产生方波激励信号,使用模拟开关对检测通道进行选择,并且添加了高精密、低温漂电阻用于定标,每隔5 min进行定标计算和阻抗检测,可以判断电极是否和皮肤接触良好,从而保证脑电信号采集的可靠性。该系统大大地降低了由模拟电路和外界因素产生的误差,提高了测量的准确性。该系统能够应用在多导联脑电采集系统中,具有很好的应用价值。
This paper proposes a method of generating a square wave excitation signal through an analog circuit,using an analog switch to select the detection channel.In addition,high precision and low temperature drift resistors have been added for calibration.The calibration calculation and impedance detection are performed every 5 minutes.This system greatly reduces the errors caused by analog circuit and external factors and improves the accuracy of measurement.It can be used in the multi-lead EEG acquisition system and has good application value.
作者
文斌
叶继伦
张旭
袁懋结
刘杰
WEN Bin;YE Jilun;ZHANG Xu;YUAN Maojie;LIU Jie(Biomedical Engineering Department,School of Medicine,Shenzhen University,Shenzhen,518060;Guangdong Key Lab for Biomedical Measurements and Ultrasound Imaging,Shenzhen,518060;Shenzhen Key Lab for Biomedical Engineering,Shenzhen,518060)
出处
《中国医疗器械杂志》
2019年第6期414-417,共4页
Chinese Journal of Medical Instrumentation
基金
广东省科技厅重点项目(2016B010108012)
关键词
电极-皮肤接触阻抗
方波激励信号
定标计算
electrode-skin contact impedance
square wave excitation signal
calibration calculation
