Magnetic field measurement system

Details Magnetic field measurement system Magnetic field measurement system

2005-02-08

2005-02-08

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C324S210000

Reexamination Certificate

active

06853185

ABSTRACT:
A magnetic field measurement system for canceling an external field is provided, in which plurality of sensing magnetometers (3) for measuring a magnetic field signal in a direction perpendicular to the center axis of a cylindrical magnetic shield (1) are arranged in two dimensions on a plane parallel to the center axis and a reference magnetometer (4) for measuring the external field parallel to the center axis as a reference signal is disposed on a plane perpendicular to the plane parallel to the center axis. The reference signal multiplied by a specified factor is subtracted from a difference between signals from the adjacent sensing magnetometers (3). The magnetic field measurement system allows measurement of an extremely weak magnetic field by efficiently canceling the external field.

REFERENCES:
patent: 4788504 (1988-11-01), Blanpain et al.
patent: 10-305019 (1998-11-01), None
Physica C 378-381, 2002, K. Saukta et al, pp. 1391-1395.
Proceedings of Biomag, 2000, Pizzella et al, pp. 939-942.

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