Proximity detector using inductive effect on oscillating circuit

Details Proximity detector using inductive effect on oscillating circuit Proximity detector using inductive effect on oscillating circuit

1988-04-22

1990-01-09

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324236, G01B 714

Patent

active

048930768

ABSTRACT:
A proximity detector is provided with an oscillating circuit generating cyclically an unsustained pseudo-oscillation. The detector includes a processing circuit having a comparator which compares the relaxation voltage of the oscillating circuit with a predetermined threshold and a logic circuit which generates control pulses with low duty ratio for a switch in series with the oscillating circuit and also an output signal as a function of the measurement pulses delivered by the comparator. The closure duration of the switch is substantially equal to half the pseudo-oscillation period.

REFERENCES:
patent: 4267522 (1981-05-01), Periot
patent: 4446627 (1984-05-01), Lovrenich
patent: 4560929 (1985-12-01), Meluyk
patent: 4611127 (1986-09-01), Ibrahim et al.
patent: 4618835 (1986-10-01), Wilson

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