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Development of a light-weight, high-performance magnetic shielding system for MEG measurements

Research Project

Project/Area Number 12355018
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Measurement engineering
Research InstitutionKyushu University

Principal Investigator

SASADA Ichiro  Faculty of Eng. Sci., Prof., 大学院・総合理工学研究院, 教授 (20117120)

Co-Investigator(Kenkyū-buntansha) SONODA Toshikatu  Kinki University, kyushu school of eng., 九州工学部, 助教授 (40107842)
YOSHITOMI Kuniaki  ISEE. Ass. Prof., 大学院・システム情報科学研究院, 助教授 (30150501)
HAYASHI Noriyuki  Faculty of Eng. Sci., ass. Prof., 大学院・総合理工学研究院, 助教授 (30156450)
KAZAMI Kunio  Yokogawa Electric Corporation, 航空宇宙特機事業部・MEGセンタ, 係長(研究職)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥27,000,000 (Direct Cost: ¥23,700,000、Indirect Cost: ¥3,300,000)
Fiscal Year 2002: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2001: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
Fiscal Year 2000: ¥12,700,000 (Direct Cost: ¥12,700,000)
KeywordsMagnetic Shield / Magnetic Shaking / Amorphous magnetic tapes / Active magnetic shield / dc-SQUID magnetometer / MEG / Biomagnetics / 生体磁気 / アクテイブ磁界補償
Research Abstract

The main objectives of this three-year research are to apply a light-weight, high-performance magnetic shield of open-ended cylindrical structure (height=2.76 m, outer diameter=0.98 m and inner diameter=0.67 m), which was built by our own design using Co-based amorphous magnetic tapes and applying magnetic shaking technique, for the MEG measurements with first-order dc-SQUID gradiometers, and to study which parts of shielding system should be improved for the MEG measurement to be done. We have succeeded in measuring MEG alpha rhythm from a human brain of 23-year old male volunteer, however, we found magnetic noise inside the shield should be further improved for the measurement of evoked MEG. Other important results and future problems are summarized below :
- Conductive cloth RF shield enclosing the magnetic shield was found to be successful to recover flux-voltage (φ-v) characteristics of dc-SQUID to the level of no RF interference.
- Low frequency magnetic fluctuation noise is observed during magnetic shaking, which was found to be in strong relation to the Barkhousen magnetic noise. Metglas 2714A amorphous magnetic tape exhibits much smaller fluctuation noise than Metglas 2705M one.
- Active compensation for openings of the cylindrical magnetic shell has been established for the helical shell and for the axial shell. 55 times improvement was obtained at 2 Hz of uniformly impressed magnetic field and 20 times at 10 Hz and 5 times at 50 Hz.
- Stable fluxgate magnetometer was developed by incorporating bias reversal technique to the orthogonal structure.
- A simple coil system for producing uniform magnetic field was proposed for active magnetic shields
-Further magnetic noise cleaning should be needed, which can be realized by taking account of the second and the third-results in the design of the shield.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (43 results)

All Other

All Publications (43 results)

  • [Publications] 梅田雄介, 田代晋久, 笹田一郎: "円筒形磁気シールドへのアクティブ・キャンセルの適用"電気学会論分誌A. 123巻8号(印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Tashiro, I.Sasada: "Cylindrical Magnetic Shield Consisting of Two C-Shaped Blocks with Magnetic Shaking Enhancement"Trans. Magn. Soc. Japan. Vol.3,No.2. 47-50 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 笹田一郎: "一様磁界発生用立方体3-コイルシステム"日本応用磁気学会誌. 27巻4号. 612-615 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Tashiro, K.Nagashima, A.Sumita, T.Fukunaga, I.Sasada: "Spontaneous magnetoencephaligraphy alpha rhythm measurement in a cylindrical magnetic shield employing magnetic shaking"J. Applied Physics. Vol.93,No.10. 6733-6735 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Sasada: "Symmetric Response Obtained With an Orthogonal Fluxgate Operating in Fundamental Mode"IEEE Trans. Magn.. Vol.38,No.5. 3377-3379 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Sasada, K.Tashiro, K.Nagashima: "High-performance bench-top cylindrical magnetic shield with magnetic shaking enhancement"IEEE Trans. Magn.. Vol.38,No.5. 3335-3337 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] E.Paperno, I.Sasada, K.Tashiro: "Experimental correction of the axial.shielding equation"IEEE Trans. Magn.. Vol.38,No.5. 3324-3326 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 田代晋久, 笹田一郎, 吉富邦明, 風見邦夫: "小型アンテナによる磁気シールド内のRFノイズ測定-dc-SQUIDセンサに与える影響-"日本応用磁気学会誌. 26巻4号. 535-538 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 笹田一郎: "円筒型磁気シールドの形状と特性"電気学会論文誌A. 121巻12号. 1062-1065 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] E.Paperno, I.Sasada: "Charts for estimating the axial shielding factors for triple shell open ended cylindrical shields"IEEE Trans. Magn.. Vol.37,No.4. 2881-2883 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 田代晋久, 小出裕之, 梅田雄介, 笹田一郎: "ビート現象を利用した磁気シールド内における線スペクトラム性ノイズのキャンセル法の提案"日本応用磁気学会誌. 25巻4-2号. 1119-1122 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Sasada, M.Shiokawa: "Noise Characteristics of Co-Based Amorphous Tapes to be Applied as Magnetic Shielding Shell for Magnetic Shaking"IEEE Trans. Magn.. Vol.39,No.5(in print). 3 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ichiro Sasada, Eugene Paperno, Pavel Ripka: "Magnetic Sensors and Magnetometers"Artech House Publishers. 494 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Umeda, K.Tashiro, I.Sasada: "Development of an Active Cancel System for Cylindrical Magnetic Shields"T.IEE Japan. Vol.123-A, No.8 (in print). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Tashiro, I.Sasada: "Cylindrical Magnetic Shield Consisting of Two C- Shaped Blocks with Magnetic Shaking Enhancement"Trans.Magn.Soc.Japan. Vol.3, No.2. 47-50 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Sasada: "Three-Coil System for Producing Uniform Magnetic Fields"Trans.Magn.Soc.Japan. Vol.27, No.4. 612-615 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Tashiro, K.Nagashima, A.Sumita T.Fukunaga, and I.Sasada: "Spontaneous magnetoencephaligraphy alpha rhythm measurement in a cylindrical magnetic shield employing magnetic shaking"J. Applied Physics. Vol.93, No.10. 6733-6735 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Sasada: "Symmetric Response Obtained With an Orthogonal Fluxgate Operating in Fundamental Mode"IEEE. Trans. Magn.. Vol.38, No,5. 3377-3379 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Sasada, K.Tashiro, K.Nagashima: "High-performance bench-top cylindrical magnetic shield with magnetic shaking enhancement"IEEE. Trans. Magn.. Vol.38, No.5. 3335-3337 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] E.Paperno, I.Sasada, K.Tashiro: "Experimental correction of the axial shielding equation"IEEE. Trans. Magn.. Vol.38, No.5. 3324-3326 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Tashiro, I.Sasada, K.Yoshitomi, K.Kazami: "Measurement of RF Noise in a Magnetic Shield with a Developed Monopole Antenna -Effect of RF Noise on FLL Operation of dc-SQUID Sensors -"Trans.Magn.Soc.Japan. Vol.27, No.4. 535-538 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Sasada: "Characteristics of Cylindrical Magnetic Shields"T.IEE Japan. Vol.121-A, No.12. 1062-1065 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] E.Paperno, I.Sasada: "Charts for estimating the axial shielding factors for triple shell open ended cylindrical shields"IEEE. Trans. Magn.. Vol.37, No.4. 2881-2883 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Tashiro, H.Koide, Y.Umeda, I.Sasada: "New Method of Canceling Line Spectrum Noise in a Magnetic Shield by Using the Beat Phenomenon"Trans.Magn.Soc.Japan. Vol.25, No.4-2. 1119-1122 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] I.Sasada, M.Shiokawa: "Noise Characteristics of Co-Based Amorphous Tapes to be Applied as Magnetic Shielding Shell for Magnetic Shaking"IEEE.Trans.Magn.. Vol.39, No.5, (in print). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ichiro Sasada,Eugene Paperno, and Pavel Ripka: "Magnetic Sensors and Magnetometers"1-494 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] K.Tashiro, K.Nagashima, A.Sumida, T.Fukunaga, I.Sasada: "Spontaneous magnetoencephalography alpha rhythm measurement in a cylindrical magnetic shield employing magnetic shaking"Journal of Applied Physics. Vol.93, No.10(in print). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 田代晋久, 笹田一郎, 吉富邦明, 風見邦夫: "小型アンテナによる磁気シールド内のRFノイズ測定-dc-SQUIDセンサに与える影響-"日本応用磁気学会誌. 26巻4号. 535-538 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] I.Sasada: "Orthogonal fluxgate mechanism operated with dc biased excitation"Journal of Applied Physics. Vol.91, No.10. 7789-7791 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] E.Paperno, I.Sasada, K.Tashiro: "Experimental correction of the axial shielding equation"IEEE. Trans. on Magnetics. Vol.38, No.5. 3324-3326 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Nagashima, I.Sasada, K.Tashiro: "High-performance bench-top cylindrical magnetic shield with magnetic shaking enhancement"IEEE. Trans. on Magnetics. Vol.38, No.5. 3335-3337 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] I.Sasada: "Symmetric Response Obtained With an Orthogonal Fluxgate Operating in Fundamental Mode"IEEE. Trans. on Magnetics. Vol.38, No.5. 3377-3379 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 田代晋久, 小出裕之, 梅田裕介, 笹田一郎: "ビート現象を利用した磁気シールド内における線スペクトラム性ノイズのキャンセル法の提案"日本応用磁気学会学会誌. 25巻4-2号. 1119-1122 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] E.Paperno, I.Sasada: "Charts for estimating the axial shielding factors for triple shell open ended cylindrical shields"IEEE Trans. on Magnetics. Vol.37,No.4. 1938-1940 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 笹田一郎: "円筒型磁気シールドの形状と特性"電気学会論文誌A. 121巻12号. 1062-1065 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 田代晋久, 吉富邦明, 風見邦夫, 笹田一郎: "小型アンテナによる磁気シールド内のRFノイズ測定"日本応用磁気学会学会誌. 26巻4-2号(印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] I.Sasada: "Orthogonal fluxgate mechanism operated with dc biased excitation"Journal of Applied Physics. Vol.91(印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 梅田雄介, 田代晋久, 笹田一郎: "円筒形磁気シールドにおける開口端侵入磁界の振る舞いと補償コイルの検討"電気学会マグネティックス研究会資料. MAG-01. 89-94 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Sasada, E.Paperno: "Magnetic sensors and Magnetometer, P.Ripka (Ed.), "Magnetic shielding"(分担)"Artech House, Boston and London. 410-424 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] E.Paperno,H.Koide,I.Sasada: "A new estimation of the axial shielding factors for multishell cylindrical shields"Journal of Applied Physics. Vol.87,No.9. 5959-5961 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] I.Sasada,E.Paperno,H.Koide: "Design of a large-scale vertical open-structure cylindrical shield employing magnetic shaking"Journal of Applied Physics. Vol.87,No.9. 5962-5964 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 笹田一郎,E.Paperno,小出裕之: "人体サイズ縦置き円筒型両端開口磁気シールドの製作及び評価"日本応用磁気学会誌. Vol.24,No.4-2. 903-906 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] E.Paperno,I.Sasada: "Magnetic Circuit Approach to Magnetic Shielding"J.Magn.Soc.Japan. Vol.24,No.1. 40-44 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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