Electromagnetic Sciences, Inc.

Homer P Blincoe

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.

Proximity detection system utilizing a movable magnet for saturating an

A microwave latching ferrite device is provided of the type associated with microwave transmission lines for effecting a phase shift or switching of the microwave signal being propagated. Driving means is provided for a latch winding of the ferrite device in the form of a blocking oscillator coupled between an input and the latch winding. The blocking oscillator includes a power transistor and a toroidal transformer coupled thereto. In response to a trigger pulse on the input, the blocking oscillator generates a single latch pulse on the latch winding, which is effective to change the degree of magnetization of the microwave ferrite device.

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Tucker, GA, United States of America

Homer P Blincoe