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The layered-capacitor method for bridge measurements of conductive dielectrics

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2 Author(s)
Gross, G.W. ; New Mexico Inst. of Min. & Technol., Socorro, NM, USA ; McGehee, R.M.

Conductive dielectrics (ice, rocks) exhibit both dielectric relaxation and DC conductance. To suppress electrode polarization effects in bridge measurements, ice samples are sandwiched between layers of polytetrafluorethylene (Teflon). A previous approach fitted up to four discrete relaxation ranges to the effective response functions of the layered dielectric and in a final step computed relaxation parameters corresponding to ice. New algorithms, based on a generalized equivalent circuit, first invert the data to extract ice response from that of the layered capacitor. Polarization strengths and relaxation times are then fitted to the ice response by a least-square procedure. DC conductivity is obtained separately at each measurement frequency. Experimental and computational methods have been carefully verified and documented. Methodology developed by the authors provide a basis for systematic investigation of contaminant effects on the electrical properties of ice. Intrinsic processes can be measured free from carrier injection effects. Future directions for computational strategies are suggested

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Electrical Insulation, IEEE Transactions on  (Volume:23 ,  Issue: 3 )