Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1981-12-18
1986-06-24
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324252, G01R 3300, G01R 3302
Patent
active
045969507
ABSTRACT:
A compensated measurement transducer for measuring a first current generates a first magnetic field of a predetermined direction which flows in a first circuit including a first conductor; a second current substantially similar to the first current is generated in a second circuit and the first current is measured by obtaining the value of the second current. The second circuit includes a compensating current conductor, which generates a second magnetic field, compensating the first magnetic field, a Wheatstone bridge to which both magnetic fields are applied, and an amplifier connected to the output of the Wheatstone bridge, and coupled to the compensating current conductor. An auxiliary magnetic field is applied to the Wheatstone bridge, which is connected to a current- or voltage-source, and includes four ferromagnetic and magnetoresistive thin film. The magnetic fields have a direction along the direction of the hard magnetic axes of the thin films, and the thin films are so positioned that the magnetization of two electrically oppositely disposed thin films, which results from the application of the first and second magnetic fields thereof, is rotated in a direction opposite to the correspondingly resulting magnetization of the remaining thin films, following application of the auxiliary magnetic field to the thin films.
REFERENCES:
Herbert et al., "Thin Film Magnetoresistance Magnetometer"; The Review of Scientific Instruments; vol. 37; No. 10; Oct. 1966; pp. 1321-1323.
Lienhard Heinz
Petr Jan
Karlsen Ernest F.
LGZ Landis & Gyr Zug AG
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