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In this paper, we describe a separable cylindrical magnetic shield and a method for evaluating the magnetic shielding performance. A human size magnetic shield (Length: 1.5m, Inner diameter: 0.5m) con...sisting of two C-shaped building blocks was constructed. Building blocks were made by winding a cobalt-based amorphous ribbon, Metglas2705M, around a non-magnetic tube cut in half along lines parallel to the axis. The effect of the air gaps between the blocks on the shielding factor was examined by a miniature model of 1/10 size. The residual magnetic field inside the shield was measured using a commercial fluxgate magnetometer and a developed induction magnetometer with a noise level better than a few pT/√Hz. A static magnetic field less than 300 nT was achieved, and the noise floor was improved with magnetic shaking enhancement from 22 pT/√Hz to 3 pT/√Hz at 10 Hz. This is the first demonstration of the shaking effect on the noise level inside a separable magnetic shield evaluated between 10 Hz and 1 kHz.続きを見る
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Mendeley出力
