Magnetic shields and instruments for measuring biomagnetic...

Electricity: measuring and testing – Magnetic – Magnetometers

Reexamination Certificate

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C505S846000, C600S409000

Reexamination Certificate

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07432705

ABSTRACT:
There is provided a magnetic shield which can shield external magnetic fields in the direction of an axis of a tubular magnetic shield and in the direction vertical to the axis. A magnetic shield has a cylindrical ferromagnetic substance2-1having openings on both ends and two superconducting loops housed in the respective insides of superconducting loop containers1-1,1-2. The superconducting loops are constructed of high critical temperature superconducting wire. The two superconducting loops have semicircle shapes and are arranged in x-direction so as to be symmetrical with respect to an axis of the cylindrical ferromagnetic substance2-1. The superconducting loop containers1-1,1-2are arranged in the insides near both open ends of the cylindrical ferromagnetic substance2-1with supports20. The superconducting loops are arranged to be vertical to the axis of the cylindrical ferromagnetic substance2-1. The superconducting loops are cooled by liquid nitrogen or a refrigerator. A lightweight, small magnetic shield having high operability can be realized.

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