MAGNETIC SHIELD SYSTEM AND MAGNETIC SHIELD METHOD

摘要

Provided is a magnetic shield system capable of reducing nonlinear noise in addition to the uniform magnetic field component noise and the inclined magnetic field component noise. The system is provided with: magnetism detection coils (X1, X2, Z1, Z2) which enclose a magnetism detection target space (4) and are aligned at mutually opposite positions; a compensation coil (2) in which magnetism is applied to a magnetism reduction target space (5) without passing through the magnetism detection coils (X1, X2, Z1, Z2); and a control device (3) in which the addition component and the difference component of the correlation space of the magnetism detection coils (X1, X2), the addition component and the difference component of the correlation space of the magnetism detection coils (Z1, Z2), and the addition component and the difference component of the correlation spaces of the magnetism detection coils (X1, X2) and the magnetism detection coils (Z1, Z2) are calculated; and a compensation coil (2) is used to apply magnetism to the magnetism reduction target space (5) so that the magnetic fields at the evaluation points set inside of the compensation coil (2) are minimized on the basis of each of the calculated addition components and difference components.