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Performance Evaluation of Low Frequency Magnetic Field Shielding by Eddy-Current

와전류에 의한 저주파 자기장 차폐 성능 평가

  • Received : 2010.06.21
  • Accepted : 2010.07.29
  • Published : 2010.09.30

Abstract

In this paper, the shielding effectiveness of aluminum shielded room with using eddy-current is calculated and measured after fabricated. The size and thickness of shielded room are decided as $2.4{\times}2.4{\times}2.4[m^3]$ and 12[mm] after AC shielding characteristics by eddy-current of conductive materials is analyzed. To verify the shielding effectiveness, a rectangular helmholtz coil is fabricated to generate magnetic field of 1.37[${\mu}T$] and measured magnetic field inside shielding room for 0.01~10[Hz]. According to calculations and measurements, AC Shielding effectiveness by eddy-current in aluminum is very small for 0.01~2[Hz] and 5 times to 11 times for 5~10[Hz].

Keywords

References

  1. 김재훈 외 3인. "평판 강자성체의 60[Hz] 자계 차폐 효율", 전자공학회, 제 81권 2호, pp 309-312, 1995.12.
  2. J.Clarke, A.I.Braginski, ‘The SQUID Handvook’ Wiley-VCH, vol.1, pp.277-280, 2004.
  3. 이수열 외 3인, "영구자석 MRI를 위한 능동형 자기 잡음 차폐시스템 기술 개발", 전자공학회, 제 40권 3호, pp.89-96, 2003.5.
  4. 문석원외 2인, "60Hz ELF 자계에 대한 고 도전율 및 고투자율 재료의 차폐효과 분석", 전자학회논문지, 54C권, 4호, pp.166-171, 2005.4.
  5. P. Heinonen, "Properties of a thick-walled conducting enclosure in low-frequency magnetic shielding", Journey of Physics, Vol.13, No.5, pp.569-560, 1980.
  6. 이용호외 6인, "생체자기계측을 위한 자기차폐실의 설치 및 특성", 한국자기학회, 제6권 4호, pp.264-271, 1996.8.
  7. Li Zhou, "An Economical Magnetocardiogram System Based on High-Tc SQUIDs", Chin Phys Lett, Vol.23, No.8, pp.2319-2322, 2006. https://doi.org/10.1088/0256-307X/23/8/097
  8. 박포규외 5인, ‘브라운관의 자기장 영향 분석용 저자기장 제어 장치의 설계 및 제작’, 한국자기학회, 제 13권 6호, pp251-255, Dec, 2003. https://doi.org/10.4283/JKMS.2003.13.6.251

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