Capacitive measuring sensor

Details Capacitive measuring sensor Capacitive measuring sensor

1979-06-14

1982-01-19

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

G01R 2726

Patent

active

043119590

ABSTRACT:
The invention relates to capacitive probe with a special shielding, in order to be able to measure small differences in distance which correspond to small differences in capacitance.
For this purpose, a first and a second electrode are located within a shield which is connected to the ground potential.
A coupling pin is located within an opening of the first electrode and, in a given instance, within a recess. A dielectric is placed between the shield, the electrodes and coupling pin, and the dielectric may be divided. The electrodes shield the coupling pin from the shield. The shield has a decoupling projection between the first and second electrodes, so that the capacitances between the first and second electrodes (as well as the capacitance between the shield and the coupling pin) are very small.
With the capacitive measuring probe, distances to a conductive material are measured, as well as the position of the bordering edges of the conductive material.

REFERENCES:
patent: 2800628 (1957-07-01), Stinson et al.
patent: 2802178 (1957-08-01), Shafer et al.
patent: 3019651 (1962-02-01), Hermanson
patent: 3084558 (1963-04-01), Wilcox et al.
patent: 3119266 (1964-01-01), Atkinson
patent: 3400331 (1968-09-01), Harris
patent: 3515987 (1970-06-01), Zurbrick et al.
patent: 3716782 (1973-02-01), Henry
patent: 3801900 (1974-04-01), Szasz
patent: 3805150 (1974-04-01), Abbe
patent: 3986109 (1976-10-01), Poduje

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