Proximity sensor oscillator utilizing controlled charge

Details Proximity sensor oscillator utilizing controlled charge Proximity sensor oscillator utilizing controlled charge

1984-11-27

1986-10-21

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

331117R, 331166, 324327, 324207, 324236, 340686, G01V 311, H03B 512

Patent

active

046188355

ABSTRACT:
A proximity sensor oscillator is disclosed having controlled charge. The proximity sensor oscillator includes a resonant circuit which oscillates at a frequency determined by the components of the resonant circuit and with a power loss that is inversely related to the distance that a sensor element of the resonant circuit is to a conductive object. The peak amplitude of the resonant circuit varies with power loss and therefore measurement of this parameter provides an indication of the proximity of the conductive object to the sensor element. Power is provided to the resonant circuit by metering a fixed charge to the resonant circuit just before the peak of the resonant circuit voltage by means of a transistor switching circuit. By operating the oscillator within a range where power loss is inversely linearly proportional to the distance of the sensor element from a conductive object, the peak amplitude of the resonant circuit varies linearly with distance and hence, when detected, provides an indication of distance between the sensor element and the conductive object.

REFERENCES:
patent: 4001718 (1977-01-01), Wilson et al.
patent: 4068189 (1978-01-01), Wilson
patent: 4267522 (1981-05-01), Periot
patent: 4446427 (1984-05-01), Lovrenich

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