Position detector utilizing absolute and incremental position se

Details Position detector utilizing absolute and incremental position se Position detector utilizing absolute and incremental position se

1993-04-16

1995-05-02

Wieder, Kenneth A.

Electricity: measuring and testing

Magnetic

Displacement

32420713, 32420721, 32420724, G01B 714, G01D 512, G01D 5244

Patent

active

054123178

ABSTRACT:
An absolute type position sensor, preferably of the magnetostrictive line type, and a semi-absolute type position sensor, preferably of the magnetic induction type, are operated in parallel with each other, and their moving portions are connected to each other. Position information, obtained by the absolute type position sensor, which is outside the range of a single pitch distance for the semi-absolute position sensor, is corrected, in accordance with a detected value obtained by the semi-absolute type position sensor, by a predetermined logic. In this way accurate absolute measurements can be made over a long range of motion with extremely high accuracy.

REFERENCES:
patent: 4717874 (1988-01-01), Ichikawa et al.
patent: 4719420 (1988-01-01), Boimond
Ivor Hawkes Associates, Measuring Mine Roof Movement, Jul. 1978, p. 31, (pp. 19-35).
U.K. Patent Application, GB 2243 689A, A Displacement Sensing System, Jun. 11, 1991.

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