AC impedance of the hydrogel-skin interface

Author

Adams, E. T Mc ; Lackermeier, A. ; Jossinet, J.

Author_Institution

Northern Ireland Bioeng. Centre, Ulster Univ., Jordanstown, UK

fYear

1994

fDate

1994

Firstpage

870

Abstract

An equivalent circuit model of the electrode-gel-skin interface impedance is described. It is shown that the circuit parameters have physical significance and that the study of their variations with time and electrodermal activity furnishes considerable insight into underlying physical processes. As hydrogels are hydrophillic, they adsorb excess moisture from the skin surface. Hydrogel based electrodes therefore have the ability to recover following bursts of electrodermal activity and are thus, it is suggested, well suited for use in psychophysiological studies

Keywords

bioelectric phenomena; electric impedance; equivalent circuits; gels; physiological models; skin; AC impedance; circuit parameters; electrode-gel-skin interface impedance; electrodermal activity bursts; excess moisture absorption; hydrogel-skin interface; hydrophillic material; psychophysiological studies; underlying physical processes; variations over time; Biomedical electrodes; Biomedical engineering; Epidermis; Equivalent circuits; Moisture; Permittivity; Psychology; Skin; Surface impedance; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 1994. Engineering Advances: New Opportunities for Biomedical Engineers. Proceedings of the 16th Annual International Conference of the IEEE

Conference_Location

Baltimore, MD

Print_ISBN

0-7803-2050-6

Type

conf

DOI

10.1109/IEMBS.1994.415188

Filename

415188