Position sensor, employing electromagnetic induction

Details Position sensor, employing electromagnetic induction Position sensor, employing electromagnetic induction

1996-02-23

1998-08-11

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

318660, 32420718, 32420724, 34087032, 341116, G01B 700, G01D 520, G01D 5243, H03M 164

Patent

active

057932026

ABSTRACT:
A position sensor is provided with a displacement signal output circuit 1 that amplifies an electromagnetically induced and detected current signal from a slider and converts the result to a rectangular wave signal; a phase difference detection circuit that compares the output signal from the displacement signal output circuit with a clock signal employed for producing the alternating current component from the scaler and detects the phase difference; and an interpolation pulse counter that determines digital displacement data from the phase difference detected at phase difference detection circuit using interpolation pulses. Further, an averaging circuit is provided at the output stage of this interpolation pulse counter which calculates and outputs an average value of a plurality of instances of digital displacement data successively calculated by the interpolation pulse counter.

REFERENCES:
patent: 3673585 (1972-06-01), Tripp et al.
patent: 3783385 (1974-01-01), Dunn et al.
patent: 4324218 (1982-04-01), Hattori et al.
patent: 4358723 (1982-11-01), Scholl et al.
patent: 4417469 (1983-11-01), Stevenson et al.
patent: 4499548 (1985-02-01), Beebe
patent: 4503922 (1985-03-01), Brosh et al.
patent: 4827531 (1989-05-01), Milford
patent: 5070485 (1991-12-01), Nyce

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