Proximity detection system utilizing a movable magnet for satura

Details Proximity detection system utilizing a movable magnet for satura Proximity detection system utilizing a movable magnet for satura

1977-11-10

1979-02-20

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

Displacement

G01R 3300

Patent

active

041409710

ABSTRACT:
Apparatus and method is disclosed for determining the position of a mechanical part from among a plurality of discrete positions. An inductor with a saturable core is placed in proximity to each position so that a permanent magnet attached to the part saturates only the core nearest the part, thereby reducing the inductance of that particular inductor. The variation in inductances are detected by comparing voltage rise times across a current limiting resistor serially connected to each inductor. The voltage across the resistor connected to the inductor nearest the position of the part will have the shortest rise time. In a two position embodiment, the variation in rise times is detected by a R/S flip-flop with each input coupled to one each of the inductors.

REFERENCES:
patent: 3662257 (1972-05-01), Fujiwara

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