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TitleDielectric measurements using novel three-electrode technique
Publication TypeConference Paper
Year of Publication1998
AuthorsArnold, W.M.
Conference NameConference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report
Date Published1998
KeywordsDielectric measurements, Dielectric properties, Electric impedance measurement, Electric insulating materials, Electrodes, Interfaces (materials), Polarization, Probes, Surface-penetrating probes, Three-electrode method
AbstractThe polarization impedance at electrode surfaces can be particularly troublesome when dielectric measurements on high-conductivity fluids or semi-solids, including biological tissues, are attempted. For much biological work, where surface-penetrating measurements are required, relatively rugged dielectric probes are necessary. In such applications, electrode distance-variation or other compensation is too time-consuming. A highly practical solution to the problem uses three electrodes of non-equal areas but well-defined geometries. For use as an rugged, surface-penetrating probe, these can take the form of concentric cylindrical arrays of stout wires. Such a probe can be readily interfaced to commercially-available impedance analyzers. By means of a reversal connection between the electrodes and the analyzer, polarization-compensated measurements may be obtained over the frequency range 100 Hz-10 MHz.

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