Position sensor based on measuring capacitance

Details Position sensor based on measuring capacitance Position sensor based on measuring capacitance

2005-05-24

2005-05-24

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S662000, C340S870370

Reexamination Certificate

active

06897660

ABSTRACT:
The armature of a position sensor has one or more electric current conductors adapted to be moved into and out of a gap between two capacitor electrodes. The capacitance between the capacitor electrodes is measured to determine the position of the armature. Electric current in the armature results from electric charges moving in the electric current conductors. The electric current conductors are adapted to restrict electric current therein to directions approximately perpendicular to the surfaces of the capacitor electrodes. Preventing current flow parallel to the surfaces of the capacitor electrodes in the electric current conductors makes the capacitance measurement insensitive to armature movement other than movement that moves the electric current conductors into or out of the gap. The position sensor is simpler and less expensive to make than known capacitance based position sensors.

REFERENCES:
patent: 3668672 (1972-06-01), Parnell
patent: 5418468 (1995-05-01), Baker et al.
patent: 5598153 (1997-01-01), Brasseur et al.
patent: 6118283 (2000-09-01), Cripe

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