基于脑电采集系统的阻抗检测方法研究

A Method for Impedance Measurements Based on EEG Acquisition System

在生物电信号测量中,电极阻抗检测是评价提取信号质量,传感器电极接触情况的一个重要指标。该文基于脑电测量平台,提出一种准确检测电极阻抗的方法,该方法基于恒流源激励信号加入人体,通过监测在人体端分压值,来测量电极阻抗,并且在不同区间采用不同参考电阻进行校准计算,减少恒流源精度对测量结果的影响,提高测量准确性。

In the bioelectric measurement, the electrode impedance detection is an important index to the signal quality evaluation and sensor electrode contact condition. In this paper, a method of accurately measuring the electrode impedance based on EEG measurement system was put forward, the method is based on the constant current source excitation signals which are added to the human body, by monitoring the human voltage to measure the electrode impedance. And different reference resistor calibration calculation in different sections was used to reduce the effect of constant current source on the precision of measurement results to improve the measurement accuracy.