Apparatus for dielectric measurements on fluids and dispersions

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Abstract
A precision dielectric cell and an experimental technique are described which may be used in conjunction with a fixed-ratio-arm AC bridge to measure conducting through to insulating fluids, including disperse systems. It is possible to cover a range 10-105 Hz in frequency, about 1-1010 Omega m in specific resistivity, and any capacitance met in practice with excellent discrimination between the resistive and reactive components. A three-terminal fully shielded configuration is achieved without sacrificing mechanical accuracy and stability. Thin films of liquids down to a few micrometres thick can be measured, with concomitant provision for assessing electrode polarisation effects as an integral part of the measurements.