Cylindrical Magnetic Shield Consisting of Two C-Shaped Blocks with Magnetic Shaking Enhancement

概要

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This paper presents a new concept for a cylindrical magnetic shield with magnetic shaking enhancement. The shield consists of two C-shaped blocks. Magnetic shaking enhancement was properly applied to the block as a result of a closed magnetic flux pass. The shape of the shield is a double concentric shell with two magnetic shunts between the outer and inner shells. The effect of the shunts on shielding performance was analyzed using an FEM program. A prototype shield model, (length : 20cm, diameter : 7.5cm, shell thickness : 0.04mm), was made by winding a cobalt-based amorphous ribbon, Metglas2705M, twice around a paper tube cut in half transversally. A large and constant transverse shielding factor of 1,000 was obtained even against a weak low-frequency magnetic field as low as 0.1Hz, 10nT.
社団法人日本磁気学会の論文
2003-05-01