Oscillators – With device responsive to external physical condition
Patent
1982-03-31
1984-10-02
LaRoche, Eugene R.
Oscillators
With device responsive to external physical condition
331 96, 331107DP, 340553, 340686, G08B 1324, H03B 914
Patent
active
044750897
ABSTRACT:
A proximity detection system is disclosed including an oscillator circuit which has an electromagnetic resonator characterized by a hollow metallic chamber, an oscillator having negative resistance characteristics 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.
REFERENCES:
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patent: 4001718 (1977-01-01), Wilson et al.
patent: 4016490 (1977-04-01), Weckenmann et al.
patent: 4030037 (1977-06-01), Tanaka et al.
patent: 4259647 (1981-03-01), Chang et al.
patent: 4371849 (1983-02-01), Longley
Honeywell Inc.
LaRoche Eugene R.
Mersereau Charles G.
Pascal Robert J.
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