Proximity detector

Details Proximity detector Proximity detector

G - Physics

08

B

340/124.3

G08B 1/08 (2006.01) G08B 13/24 (2006.01)

Patent

CA 1191226

ABSTRACT OF THE DISCLOSURE A proximity detection system is disclosed including an oscillator circuit which has an electro- magnetic resonator characterized by a hollow metallic chamber, an oscillator having negative resistance charac- teristics fixed in the chamber, and a source of direct current connected in series with the oscillator and the chamber. A radiating iris opening is provided in the chamber of a size and disposition such that oscillation of said oscillator circuit means is damped except in the proximate presence of an object before the iris. A detector responsive to a characteristic change in output in the oscillator circuit produced by the oscillation thereof such as an operational amplifier or comparator produces an output indicative of the presence of an object.

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