Electrical moisture sensor

Details Electrical moisture sensor Electrical moisture sensor

1979-12-18

1981-09-08

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 61P, G01R 2726

Patent

active

042887429

ABSTRACT:
A moisture sensor including a probe formed with a first ring of spines extending in parallel outward from a base and a second ring of spines extending in parallel outward from the base separated and insulated from the first ring, the spines forming an effective coaxial capacitor and being insertable into material to be sensed and an RC bridge circuit, preferably a Wien bridge connected to the rings to measure the impedance of the material.

REFERENCES:
patent: 2587771 (1952-03-01), Schoenbaum et al.
patent: 2870404 (1959-01-01), Oxley
patent: 2975361 (1961-03-01), Holaday
patent: 3803570 (1974-04-01), Barlow
patent: 3882381 (1975-05-01), Gregory
patent: 3986110 (1976-10-01), Overall et al.
patent: 4135151 (1979-01-01), Rogers et al.
patent: 4174498 (1979-11-01), Preikschat
patent: 4181881 (1980-01-01), Preikschat
Foldvari et al., Capacitive Transducers, Instruments & Control Systems, Nov. 1964, pp. 77-84.

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