Proximity detector employing magneto resistive sensor in the cen

Details Proximity detector employing magneto resistive sensor in the cen Proximity detector employing magneto resistive sensor in the cen

1987-12-29

1989-08-15

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

307309, 307362, 324174, 324228, 324235, 324252, 335302, G01B 730, G01P 348, H03K 1795, H01F 702

Patent

active

048578410

ABSTRACT:
The present invention is a proximity sensor employing a magneto resistive structure. This proximity sensor includes a toroidal magnet having a central aperture, an inner circumference and an outer circumference. This toroidal magnet has a first magnetic pole at the inner circumference and a second magnetic pole at the outer circumference thereby creating a magnetic field null at a center portion of the central aperture. A magneto resistive structure is disposed at the magnetic field null in the central aperture of the toroidal magnetic. This magneto resistive structure has a resistance dependent upon magnetic flux. The proximity of a magnetically permeable target to the toroidal magnet shifts the position of the magnetic null, thereby causing a large change in the magnetic flux through the magneto resistive structure. An electrical detection circuit detects changes in this resistance for indication of the proximity of the magnetically permeable target.

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