環境磁気ノイズと磁気シールド技術V : アクティブ磁気シールドの種類と性能

概要

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This paper describes the types and performance of active magnetic compensation systems mainly used for biomagnetic measurements. First, it investigates methods of magnetic shielding other than the use of a magnetically shielded room (MSR), such as the use of a superconducting magnetic shield and magnetic shaking. Next, performance factors such as cost, shielding effect and area, visibility of the enclosure, and mobility of active compensation are compared with those of the MSR and compensating areas of active shielding depending on the configuration of the canceling coil and the MSR are computed by magnetic field analysis, using Biot-Savart's law and the finite element method, and compared. The merits and demerits of feedforward and feed-back compensation systems with and without MSRs are the discussed. Finally, the paper describes an attempted magnetocardiogram (MCG) measurement by means of a SQUID gradiometer with only an active shielding, using a reference sensor of a fluxgate magnetometer.
社団法人日本磁気学会の論文
2005-12-01