Magnetic field gradiometer with improved correction circuits

Details Magnetic field gradiometer with improved correction circuits Magnetic field gradiometer with improved correction circuits

1995-08-18

1997-06-24

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

324225, 324247, 324253, 324345, 36457101, G01R 33022, G01R 33025, G01R 3304, G01V 308

Patent

active

056420455

ABSTRACT:
An improved magnetic field gradiometer having major and minor correction circuits is disclosed. The major correction circuits cancel the main components of an applied magnetic field, such as the earth's uniform field, and the minor correction circuits correct for smaller, but still significant effects, such as assembly imperfections and unavoidable cross-talk between the elements of the gradiometer. Also disclosed is a method for processing the gradient data from the gradiometer to enable the positions of magnetic objects to be located in space.

REFERENCES:
patent: 3398360 (1968-08-01), Behr et al.
patent: 4327498 (1982-05-01), Setter et al.
patent: 4475078 (1984-10-01), Itani
patent: 5113136 (1992-05-01), Hayashi et al.
patent: 5122744 (1992-06-01), Koch
patent: 5187436 (1993-02-01), Mallick
W.M. Wynn et al, IEEE Transactions on Magnetics, vol. MAG-11, No. 2, Mar. 1975 pp. 701-707, entitled "Advanced Superconducting Gradiometer/Magnetometer Arrays and a Novel Signal Processing Technique".

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