Linear oscillator for proximity sensor

Details Linear oscillator for proximity sensor Linear oscillator for proximity sensor

1976-10-07

1978-01-10

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

324208, 324236, 331117R, 331186, 340258C, G01R 3312, G08C 2100

Patent

active

040681890

ABSTRACT:
A linear oscillator circuit has a resonant circuit which develops an oscillating voltage V.sub.R having an amplitude proportional to a distance between a conducting body and the resonant circuit located within a probe. A control power drive circuit coupled to the output of the resonant circuit switches a current through the resonant circuit during each period of oscillation of the voltage V.sub.R. A reference current source is coupled to the control power drive circuit for drawing a current through the control power drive circuit and the resonant circuit. The magnitude of the current is equal to the magnitude of an independently established reference current. A detector circuit responsive to the value of the amplitude of oscillation may be provided to indicate the distance of the conductive body from the resonant circuit-containing probe.

REFERENCES:
patent: RE24779 (1960-02-01), Elam
patent: 3609580 (1971-09-01), Thompson et al.
patent: 3743853 (1973-07-01), Dittman et al.

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