Variable frequency inductive proximity sensor

Details Variable frequency inductive proximity sensor Variable frequency inductive proximity sensor

1995-04-04

1996-04-16

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

32420716, 324236, 324327, G01V 311

Patent

active

055086624

ABSTRACT:
A proximity sensor includes a coil for sensing metal objects which are part of an oscillatory circuit and an oscillator which drives the oscillatory circuit at a constant frequency. A tuning device is connected in parallel with the oscillatory circuit. The tuning device is a variable gain amplifier with feedback via an inductive or capacitive impedance.

REFERENCES:
patent: 3848243 (1974-11-01), Schirmer
patent: 4731591 (1988-03-01), Weigand

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