Circuit arrangement for sensing the displacement of a movable ir

Details Circuit arrangement for sensing the displacement of a movable ir Circuit arrangement for sensing the displacement of a movable ir

1988-04-27

1989-08-22

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324225, 324 59, G01R 1152, G01R 2726, G01B 714, G01N 2772

Patent

active

048599425

ABSTRACT:
The arrangement comprises, a circuit arrangement for measuring the inductance of an inductive displacement or position sensor having a magnetic coil and a magnetic circuit including a movable iron core; a constant controlled current source connected to the magnetic coil; a switch for cutting off the constant controlled current fed to the magnetic coil; a cut-off voltage induced into the coil; and an electronic circuit for measuring the decay time of the current flowing through the coil after the switch is opened. The material for the magnetic circuit and the coil for the inductive displacement sensor is selected such that the temperature coefficients of the coil and the magnetic circuit compensate each other.

REFERENCES:
patent: 4074185 (1978-02-01), Dardenne
patent: 4219740 (1980-08-01), Little
patent: 4258315 (1981-03-01), Westra
patent: 4649341 (1987-03-01), Ulbirch et al.

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