Scheer H J, Burghoff M
Physikalisch-Technische Bundesanstalt, Berlin.
Biomed Tech (Berl). 2002;47 Suppl 1 Pt 2:564-5. doi: 10.1515/bmte.2002.47.s1b.564.
A low-noise multichannel EEG-Amplifier-System has been designed and analyzed, which is electromagnetically compatible with SQUIDs. The EEG- together with the MEG-System is operated inside the quiet environment of a magnetically shielded room, hence no electrical 50 Hz-Artifact is detectable. Measurements pointed out that the influence of amplifier- and electrochemical-noise of electrodes to averaged EEG-spectral densities is less than 1% within the frequency range 0.5 to 70 Hz. Thermal noise of the skin-electrode-interface, equivalent to a resistor of 30 k omega, only begins to take effect above 20 Hz, suggesting that there is no need of skin abrasion.
设计并分析了一种与超导量子干涉仪电磁兼容的低噪声多通道脑电图放大器系统。脑电图与脑磁图系统在磁屏蔽室的安静环境中运行，因此检测不到50Hz的电伪迹。测量结果表明，在0.5至70Hz频率范围内，电极的放大器噪声和电化学噪声对平均脑电图频谱密度的影响小于1%。皮肤-电极界面的热噪声相当于一个30kΩ的电阻，仅在20Hz以上开始起作用，这表明无需进行皮肤擦伤处理。
