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Sensing and Coupling of Electric Biosignals

  • Eugenijus KaniusasEmail author
Chapter
Part of the Biological and Medical Physics, Biomedical Engineering book series (BIOMEDICAL)

Abstract

For diagnostic sensing and therapeutic coupling of electric biosignals they have to cross the electrode/tissue boundary across the skin. Thereby metal ion and redox electrodes as well as polarizable and non-polarizable electrodes are subjected to direct and alternating voltage application. Boundaries become polarized while charge transfer, diffusion, and coupled reactions take place on the electrode surface. The formed electrode impedance contributes to the whole body impedance that determines the effectiveness of diagnosis and therapy using electrodes. Any measurement or application of electric biosignals is subjected to capacitive and inductive coupling of interference signals as well as to common-mode and differential-mode interferences. Potential countermeasures include passive and active shielding, driven-right-leg-circuit, notch filters, and preamplifiers.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Head of Research Unit Biomedical Electronics, Head of Research Group Biomedical Sensing, Chairman of Study Commission Biomedical EngineeringVienna University of Technology, Institute of Electrodynamics, Microwave and Circuit EngineeringViennaAustria

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