極低周波微小磁界振動に対する増分透磁率μΔを用いた磁気シールド材料評価

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2020/06/01

タイトル(英語): Evaluation Method for Magnetic Shield Material using Incremental Permeability against Very Low Frequency Micro Magnetic Field Fluctuation

著者名: 榊原　満（（株）オータマ／金沢工業大学），武藤　暁（（株）オータマ），奥田　学（（株）オータマ），足立　善昭（金沢工業大学），上原　弦（金沢工業大学）

著者名(英語): Mitsuru Sakakibara (OHTAMA Co., Ltd./Kanazawa Institute of Technology), Satoru Muto (OHTAMA Co., Ltd.), Manabu Okuda (OHTAMA Co., Ltd.), Yoshiaki Adachi (Kanazawa Institute of Technology), Gen Uehara (Kanazawa Institute of Technology)

キーワード: 磁気シールド，磁気シールドルーム，増分透磁率，生体磁気計測，MEG　　magnetic shield，magnetically shielded room，incremental permeability，biomagnetic measurement，magnetoencephalography

要約(英語): Magnetoencephalography (MEG) requires a magnetically shielded room (MSR) for protection against very slow and micro magnetic noise. An index called initial permeability, μi, is generally used to evaluate the performance of high-quality magnetic shielding materials. However, the measurement conditions, such as the magnetic strength and frequency of the μi, are not suitable for an MEG magnetic shield; further, the effect of background geomagnetism (DC magnetic field) is not considered. In this paper, we propose incremental permeability, μΔ, as an index to evaluate a magnetic shield for very low-frequency micro magnetic field fluctuations. In addition, the μΔ measurement system is described in detail. The measurement conditions of the magnetic strength and frequency were set at 1 to 0.001A/m and 3 Hz, respectively. We experimentally confirmed that geomagnetism does not have much influence on the measurement of μΔ. Lastly, the effectiveness of this evaluation method was demonstrated via results obtained for three different samples.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.140 No.6 （2020）

本誌掲載ページ: 331-337 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/140/6/140_331/_article/-char/ja/