Dielectric-constant measuring apparatus

Details Dielectric-constant measuring apparatus Dielectric-constant measuring apparatus

1974-05-28

1976-06-22

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2704

Patent

active

039654168

ABSTRACT:
Accurate and stable measurement of the dielectric constant of a substance or a mixture of substances is achieved by the use of an oscillatory system incorporating a shorted transmission line as a delay means, to cycle the system. The substance for which the dielectric constant is to be determined is introduced between or about the elements of the transmission line so as to vary the propagation rate or delay of signals through the transmission line. Accordingly, the frequency of oscillation for the system is indicative of the dielectric constant of the substance. Several specific forms of transmission lines, embodied as sensors are disclosed along with different forms of oscillator drivers.

REFERENCES:
patent: 3162807 (1964-12-01), Alford
patent: 3460031 (1969-08-01), Evans et al.
patent: 3789296 (1974-01-01), Caruso, Jr. et al.
patent: 3853005 (1974-12-01), Schendel

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