一、绪论一般测量生物电用的传导型金属电极,为了使电极和皮肤有良好的电接触以便导出电位,需要在皮肤上涂导电膏。但是长时间使用时,导电膏易干燥,另外它对皮肤有化学的刺激。还有,金属电极和组织液(如汗液等)或导,膏之间产生极化电压之类的直流电位,而这个直流电位易随着呼吸波动,将引起基线波动产生波形失真,有时还容易引起放大器饱和。极化电压大小主要取决于金属材料和电解 I. INTRODUCTION Conductive metal electrodes for measuring bioelectricity are generally used. In order to make good electrical contact between the electrodes and the skin in order to derive the potential, conductive paste needs to be applied to the skin. But when used for a long time, conductive paste is easy to dry, in addition it has chemical irritation to the skin. Also, the metal electrode and tissue fluid (such as sweat, etc.) or guide, paste generated between the polarization voltage like the DC potential, and the DC potential easily with respiratory fluctuations, will lead to fluctuations in the baseline waveform distortion, and sometimes easy to cause Amplifier saturated. Polarization voltage depends on the size of the metal material and electrolysis