Dielectric constant measuring apparatus

Details Dielectric constant measuring apparatus Dielectric constant measuring apparatus

G - Physics

01

R

324/42

G01R 27/26 (2006.01)

Patent

CA 1271524

72497-1 ABSTRACT Disclosed is an apparatus for measuring the mean permittivity of a sample of material comprising a sense chamber for containing the sample, the sense chamber comprising a cylin- drical tube of low permittivity, low conductivity material and having an outer surface provided with at least three helical foil electrode structures extending along substantially the entire length of the tube. Each electrode structure comprises an inner sense electrode in contact with the tube and an outer shield electrode. The sense electrode and the shield electrode are separated by a thin barrier of insulating material. The apparatus further comprises a source for applying out of phase alternating voltage signals to the electrode structures to produce a rotating electrical field in the sense chamber and for deriving a voltage read-out signal proportional to the sum of the charging currents applied to the electrode structures, the read-out signal being directly related to the mean permittivity of said sample.

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