Method and apparatus for determining dielectric constant

Details Method and apparatus for determining dielectric constant Method and apparatus for determining dielectric constant

1983-04-11

1985-11-26

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 61P, 324 61QS, G01N 2702, G01R 2726

Patent

active

045556610

ABSTRACT:
An improved method and apparatus for determining the dielectric constant of materials which flow using capacitive techniques, having an electrode device with at least two output terminals and three or more electrodes spaced at fixed distances from one another. At least two of the electrodes are connected through a switch so that first and second capacitances appear at the output terminals of the electrode device depending upon the position of the switch. The output terminals of the electrode device being connected to an oscillator which produces an output signal indicative of the frequency of the oscillator's oscillation which is proportional to the capacitance at the terminals of the electrode device. The output signal of the oscillator is connected to a bi-directional counter or microprocessor which is used to calculate a value proportional to the change in capacitance of the electrode device when the switch is closed and to thereby determine the dielectric constant of a material being tested.

REFERENCES:
patent: 3025465 (1962-03-01), Breen
patent: 3297941 (1967-01-01), Wolfendale
patent: 3436320 (1969-04-01), Marsh
patent: 3488758 (1970-01-01), Benson
patent: 4219776 (1980-08-01), Arulanandan

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