環境磁気ノイズと磁気シールド技術III : 生体磁気計測用磁気シールドルームの性能と設計指針No.2(<特集>「磁性に関連したセンシング技術の広がりとその最前線」その2-磁気イメージング-)

概要

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In this paper, first, the method for analyzing a magnetic field using the edge finite element method is described. This method is effective for evaluating the shielding factor (SF) of a magnetically shielded room (MSR), because the nonlinear magnetic characteristics can be easily taken into account. Second, in order to establish the standard evaluation method, the size and configuration of the noise generation coil are investigated by finite element analysis using a magnetically shielded room (MSR). The MSR is a brick type consisting of two layers of permalloy, and has a door similar to that of an actual MSR. The effect on the shielding factor (SF) of the size of a pair of exciting coils at a low frequency such as 1Hz is investigated by setting up the coils close to the MSR, and the effect of the distance between the coil and MSR is also investigated by using small coils. Third, the effect of the door of the MSR on the SF is investigated by comparing the magnetic field distribution in the same MSR, with a gap between the door and the wall which isolates them magnetically and electrically, to that without a gap obtained by 3-D magnetic field analysis taking account of eddy currents.
社団法人日本磁気学会の論文
2005-08-01