Dielectric constant monitor

Details Dielectric constant monitor Dielectric constant monitor

1991-06-21

1992-09-15

Pascal, Robert J.

Oscillators

Phase shift type

331136, 331 65, 324682, 324690, G01R 2700

Patent

active

051481251

ABSTRACT:
Monitoring of the average dielectric constant in an extended volume of a medium such as soil is achieved using an oscillator incorporating a transmission line to be embedded in the medium. The transmission line is connected as the feedback loop of an amplifier, for one-way propagation of an electrical signal with a delay determined largely by the dielectric properties of the medium, such as its moisture content. The oscillation frequency is indicative of the dielectric constant of the medium.

REFERENCES:
patent: 3766496 (1973-10-01), Whitehouse
patent: 3965416 (1976-06-01), Friedman
patent: 4291283 (1981-09-01), Castera
patent: 4799028 (1989-01-01), Weaver et al.

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