Geomagnetic direction sensor

Details Geomagnetic direction sensor Geomagnetic direction sensor

1995-03-28

1999-11-09

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

324247, 33355R, G01R 3306, G01C 1732, G01C 1728

Patent

active

059821760

ABSTRACT:
A geomagnetic direction sensor has a plurality of magnetic cores for converging terrestrial magnetism arranged circumferentially with pre-set gaps, and magneto-resistive effect devices in the gaps so as to lie substantially at right angles to the direction of the magnetic field in the gaps. The geomagnetic direction sensor has at least a pair of magneto-resistive effect devices lying substantially at right angles to each other. The magnetic core is formed of a magnetic material having soft magnetic properties. The current is supplied to the excitation coils placed around the magnetic core for applying a bias magnetic field to the magneto-resistive effect devices. Another set of magneto-resistive effect devices are connected in series with the magneto-resistive effect devices arranged within the gap so as to be substantially parallel to the direction of the magnetic field.

REFERENCES:
patent: 3260932 (1966-07-01), Weiss et al.
patent: 3849724 (1974-11-01), Ghibu et al.
patent: 3905121 (1975-09-01), Takeda et al.
patent: 4668913 (1987-05-01), Vinal
patent: 4849696 (1989-07-01), Brun et al.
patent: 4901177 (1990-02-01), Lazzari
patent: 4954920 (1990-09-01), Yamada et al.

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