Miniature magnetic field sensor with compact magnetization coil

Details Miniature magnetic field sensor with compact magnetization coil Miniature magnetic field sensor with compact magnetization coil

1995-02-16

1996-12-10

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetometers

324260, 336206, G01R 3302

Patent

active

055834361

ABSTRACT:
A magnetic field sensor includes a number of magnetoresistive sensor elements situated in one plane, and which have the same privileged directions of magnetization, and a magnetization coil connected to a current pulse generator which alternately supplies the magnetization coil with opposite current pulses to generate a magnetic field which extends parallel to the privileged directions of the sensor elements and is strong enough to reverse the direction of internal magnetization thereof The magnetization coil includes an electrically insulating substrate which supports an approximately spiral-shaped electric conductor track including a group of parallel arranged active conductor elements. An electric current flows through the conductor track in the same direction in all active conductor elements of the relevant group. The magnetic field sensor is mounted on the substrate in the immediate vicinity of the group of active conductor elements such that the plane of the sensor elements extends substantially parallel to the plane of the active conductor elements and the privileged direction of magnetization of the sensor elements extends perpendicular to the longitudinal direction of the active conductor elements.

REFERENCES:
patent: 4593245 (1986-06-01), Viertl et al.
patent: 4706020 (1987-11-01), Viertl et al.
Patent Abstracts of Japan, vol. 15, No. 511, p-1292, Abstracts of JP, A, 3-223685 (Fujitusu Ltd.), 2 Oct. 1991.
Philips, Technical Publication 268, dated Jul. 14, 1988.

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