Differential magneto-impedance magnetic field sensor

Details Differential magneto-impedance magnetic field sensor Differential magneto-impedance magnetic field sensor

1996-05-30

1998-11-03

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

324253, G01R 3302, G01R 3304, H01F 2102, G01B 5127

Patent

active

058314326

ABSTRACT:
A magnetic field sensor for gradient field detection (gradient type magnetic field sensor) cancels relatively uniform disturbance magnetic fields (background magnetic fields) such as the terrestrial field through the use of two magneto-impedance elements, thereby making it possible to detect only a signal magnetic field (gradient field) which is considerably localized spatially. The magnetic field sensor includes a pair of sensor heads made of an amorphous wire, and a self-oscillation type electronic circuit for detecting a spatially uniform magnetic field or a differential value of a spatially gradient magnetic field by switching the direction of a bias magnetic field applied to the pair of sensor heads.

REFERENCES:
patent: 3621382 (1971-11-01), Valet
patent: 4739263 (1988-04-01), Mohri et al.
IEEE Transactions on Magnetics, vol. 31, No. 6, Nov. 1995 pp. 3134-3136, Bushida et al.

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