Patent ID: 6528994
Filing Date: 2003-03-04
Classification: G01R

Abstract:
A magnetic field measuring apparatus, comprising:a magnetic field shielding apparatus including a plurality of non-magnetic cylindrical members on which a plurality of high-permeability sheets having a high-permeability are located in a state of being partially overlapped with each other, said cylindrical members being located in such a manner as to surround an axis of a first direction concentrically and having a hollow portion, said cylindrical member located on an innermost-side having a first opening at one end of said first direction, a second opening at the other end of said first direction, and a third opening penetrating said plurality of cylindrical members in a direction perpendicular to said axis of said first direction, a component of an external magnetic field in said direction perpendicular to said first direction being shielded in an inner-side space of said cylindrical member located on said innermost-side, a living-body holder located in said inner-side space for holding a living body in such a manner as to make a body-axis direction substantially parallel to said axis of said first direction, and a cryostat which is inserted into said third opening and whose bottom plane is located in said inner-side space for maintaining a plurality of SQUID magnetic-flux meters at a low-temperature, wherein said plurality of SQUID magnetic-flux meters detect a component of a magnetic field in said direction perpendicular to said first direction, said magnetic field being generated from said living body.