磁束反発を利用した能動補償の分離型磁気シールドへの適用

抄録

A new active compensation method using magnetic repulsion is presented which is applicable to a separate magnetic shield. A pair of the compensation coil is set on each of the separate shells and generate compensation magnetic field to bend the flux lines of the disturbing magnetic field in order to pass them below and above the magnetic shells. We have applied the method to a small laboratory model and confirmed a large shielding efficiency of the new compensation method. The transverse shielding factor measured perpendicularly to the plane separating two shells was 1.4 for the magnetic field of 10 Hz, 10 μT, when the compensation was off, however, it was larger than 1,000 when the compensation was on.