パッシブシェル付マルチシェルシールドにおける能動補償効果

• 斉藤 拓司

  九州大学大学院総合理工学府

• 田代 晋久

  九州大学大学院総合理工学府

• 笹田 一郎

  九州大学大学院総合理工学府

書誌事項

タイトル別名

• Performance of Active Compensation for a Multi-shell Shield with an Inner Passive Shell
• パッシブシェル ツキ マルチシェルシールド ニ オケル ノウドウ ホショウ コウカ

抄録

Active compensation is studied for a multi-shell shield with an inner passive shell. We made a miniature shield consisting of four concentric magnetic shells, which has the same structure as our previously developed shielding system for a demonstration of MEG alpha-rhythm measurement. FINEMET rather than Permalloy was chosen as the material for the inner passive shell. We measured the amplitude and phase of the incoming magnetic field to the shielded area. It was found that the inner passive shell can help to suppress the phase difference between the observed field and the external field. A model for explaining this phenomenon is presented. We tried a simple feed-forward active compensation system for the shield, which consists of three canceling ring coils and a single monitoring flux-gate magnetometer. The axial shielding factor at 10 Hz, 10 μT was 300, and with active compensation a value of 12,000 was achieved.

収録刊行物

• 日本応用磁気学会誌

  日本応用磁気学会誌 29 (5), 567-570, 2005

  公益社団法人 日本磁気学会

キーワード

• magnetic shield
• active compensation
• passive shell
• phase different
• magnetic shaking

詳細情報

• CRID: 1390001205092447872
• NII論文ID: 110002972511
• NII書誌ID: AN0031390X
• DOI: 10.3379/jmsjmag.29.567
• ISSN: 18804004
• ISSN: 02850192
• NDL書誌ID: 7351407
• Web Site: http://id.ndl.go.jp/bib/7351407
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7351407
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10467067
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • NDL-Digital
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可