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A Study on comnon-mode-driven shield for capacitive coupling active electrode  

Lim, Yong-Gyu (상지대학교 한방의료공학과)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.13, no.4, 2012 , pp. 201-206 More about this Journal
Abstract
The indirect-contact ECG measurement is a newly developed method for unconstrained and nonconscious measurement in daily life. This study introduced a new method of electrode circuit design developed for reducing the 60Hz power line noise observed at the indirect-contact ECG measurement. By the introduced common-mode-driven shielding, the voltage of the electrical shield surrounding the capacitive coupling electrode is maintained at the same as the common mode voltage. Though the method cannot reduce the level of common mode voltage itself, that reduces effectively the differential mode noise converted from the common mode voltage by the difference of cloth impedance between the two capacitive coupling electrode. The experiment results using the actual indirect-contact ECG showed that the 60Hz power line noise was reduced remarkably though the reduction ratio was smaller than the expected by the theory. Especially, the reduction ratio became large for the large difference of cloth. It is expected that the introduced method is useful for reducing the power line noise under condition of poor electrical grounding.
Keywords
Indirect-contact ECG; Capacitive coupling active electrode; Common mode noise; Active shielding;
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