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Development of Multi-Channel Magnetic Field Sensor Utilizing Faraday Elements

Research Project

Project/Area Number 13480131
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY

Principal Investigator

TSUJI Shunji  Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, Associate Prof., 原子炉工学研究所, 助教授 (90272723)

Co-Investigator(Kenkyū-buntansha) SHIMADA Ryuichi  Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, Professor, 原子炉工学研究所, 教授 (40206181)
TSUTSUI Hiroaki  Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, Assistant Prof., 原子炉工学研究所, 助手 (20227440)
Project Period (FY) 2001 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥17,100,000 (Direct Cost: ¥17,100,000)
Fiscal Year 2004: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2003: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2002: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2001: ¥9,700,000 (Direct Cost: ¥9,700,000)
KeywordsFaraday effect / magnetic field sensor / polarimeter / cross Nichole method / Zeeman effect laser / heterodyne / photoelastic modulatro / magnetic confinement / クロスニコル法 / ロックインアンプ / 偏光面回転 / SLD / 偏光変調法
Research Abstract

To develop a polarimeter which measures magnetic field strength by the use of Faraday elements, the cross Nichole method, polarization modulation method and polarization rotation method were tested and compared.
Although the cross Nichole method does not have enough accuracy, which depends on the polarization angle, it was confirmed that its fast response and low cost is superior to the two heterodyne methods.
The measurement accuracy of the polarization modulation method utilizing two photoelastic modulators also depends on the polarization angle ; the standard deviation has a maximum of about 0.07 deg. around a polarization angle of 22.5 deg. and the signal to noise ratio was evaluated to has a peak of about 150 near 0 deg. The stability of the zero level is much better than that of the polarization rotation method. The variations of the zero level were within 0.01 deg.
For the light source of the polarization rotation, a Zeeman-effect laser was adopted to stabilize the zero level of the phase difference. The lasing, however, becomes unstable when a polarization maintaining optical fiber was used for free optical layout of multi-channel measurements. With an optical isolator, the temperature of which was well controlled to be constant, can reduce the backward light and hence the lasing was managed to be stable. When the whole optical isolator was put in a isotherm box, the measurement accuracy was demonstrated to be 0.01% for a long period of 10000 s.
The Verdet constants of candidate Faraday elements such as lead glass and ZnSe were evaluated under magnetic fields up to 5 T using a superconducting magnet.

Report

(5 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (13 results)

All 2004 2003 2002 Other

All Journal Article (9 results) Publications (4 results)

  • [Journal Article] Electron Density Profile Measurements on LHD2004

    • Author(s)
      K.Kawahata, K.Tanaka, T.Tokuzawa, S.Tsuji-Iio et al.
    • Journal Title

      IEEE Transaction. Plasma Science 32・2

      Pages: 519-524

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Electron Density Profile Measurements on LHD2004

    • Author(s)
      K.Kawahata, K.Tanaka, T.Tokuzawa, S.Tsuji-Iio et al.
    • Journal Title

      IEEE Trans.Plasma Science 32・2

      Pages: 519-524

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Electron Density Profile Measurements on LHD2004

    • Author(s)
      K.Kawahata, K.Tanaka, T.Tokuzawa, S.Tsuji-Iio et al.
    • Journal Title

      IEEE Trans. Plasma Sci. 32・2

      Pages: 519-524

    • Related Report
      2004 Annual Research Report
  • [Journal Article] FEM Analysis of Stress Distribution in Force-Balanced Coils2004

    • Author(s)
      H.Tsutsui, S.Kajita, Y.Ohata, S.Nomura, S.Tsuji-Iio, R.Shimada
    • Journal Title

      IEEE Trans. Appl. Supercond., 14・2

      Pages: 750-753

    • Related Report
      2004 Annual Research Report
  • [Journal Article] CO_2 Laser Imaging Interferometer for High Spatial Resolution Electron Density Profile Measurements on LHD2003

    • Author(s)
      T.Akiyama, K.Tanaka, L.N.Vya-cheslavov, S.Tsuji-Iio et al.
    • Journal Title

      Review of Scientific Instruments 74・3

      Pages: 1638-1641

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] CO_2 Laser Polarimeter for Electron Density Profile Measurement on the Large Helical Device2003

    • Author(s)
      T.Akiyama, S.Tsuji-Iio, R.Shimada, K.Nakayama et al.
    • Journal Title

      Review of Scientific Instruments 74・5

      Pages: 2965-2703

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] CO_2 Laser lmaging Interferometer for High Spatial Resolution Electron Density Profile Measurements on LHD2003

    • Author(s)
      T.Akiyama, K.Tanaka, L.N.Vya-cheslavov, S.Tsuji-Iio et al.
    • Journal Title

      Review of Scientific Instruments 74・3

      Pages: 1638-1641

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Bench Testing of Magneto-Optic Polarimeters for Long-Pulsed Fusion Devices2002

    • Author(s)
      T.Akiyama, R.Shimada, M.Takahashi, S.Tsuji-Iio et al.
    • Journal Title

      IEEE Transaction on Applied Superconductor 12・1

      Pages: 1647-1650

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Bench Testing of Magneto-Optic Polarimeters for Long-Pulsed Fusion Devices2002

    • Author(s)
      T.Akiyama, R.Shimada, M.Takahashi, S.Tsuji-Iio et al.
    • Journal Title

      IEEE Trans.Appl.Supercon. 12・1

      Pages: 1647-1650

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] T.Akiyama, K.Tanaka, L.N.Vyacheslavov, S.Tsuji-Iio et al.: "CO_2 Laser Imaging Interferometer for High Spatial Resolution Electron Density Profile Measurements on LHD"Review of Scientific Instruments. 74・3. 1638-1641 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Akiyama, S.Tsuji-Iio, R.Shimada, K.Nakayama et al.: "CO_2 Laser Polarimeter for Electron Density Profile Measurement on the Large Helical Device"Review of Scientific Instruments. 74・5. 2965-2703 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Akiyama, R.Shimada, M.Takahashi, S.Tsuii-Iio et al.: "Bench Testing of Magneto-Optic Polarimeters for Long-Pulsed Fusion Devices"IEEE Transaction on Applied Superconductor. 12・1. 1647-1650 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Akiyama, R.Shimada, M. Takahashi, S.Tsuji-Iio, et al.: "Bench Testing of Magneto-Optic Polarimeters for Long-Pulsed Fusion Devices"IEEE Transaction on Applied Superconductor. (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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