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US 5,418,512 AGranted
Superconducting magnetic shield
AssigneesMitsui Kinzoku Kogyo Kabushiki Shisha, Rikagaku Kenkyusho
InventorsHiroshi Ohta, Masakazu Aono, Kazuhiko Kato, Kazutomo Hoshino, Hidefusa Takahara, Tomonobu Nakayama, Eiichi Sudoh
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Abstract
This invention provides a superconducting magnetic shield and a magnetic shielding apparatus including the same, thereby accurately measuring an extremely weak magnetic field such an magnetoencephalographic waves by reducing the influence of magnetic field of the earth or magnetic noises.
Claims1
An apparatus for measurement of biomagnetism, said apparatus comprising:
- a bismuth high temperature oxide superconducting shield opened on at least one end;
- a sensor inserted through said at least one end, wherein said sensor measures magnetoencephalographic waves emitted from a biological sample disposed in said shield;
- a ferromagnetic material magnetic shield provided outside said bismuth high temperature oxide superconducting shield, wherein said bismuth high temperature oxide comprises a composition of Bi.sub.18 Pb.sub.0.4 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.y.
Dependencies are inferred from the claim text.