Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Designs and Fabrications of High-TC SQUID Magnetometer for Measuring a Weak Signal without Magnetic Shielding

비자기 차폐환경에서 미세자기신호 측정을 위한 고온 초전도 SQUID 자력계의 설계 및 제작

  • Yu, K.K. (Korea Research Institute of Standards and Science) ;
  • Kim, I.S. (Korea Research Institute of Standards and Science) ;
  • Park, Y.K. (Korea Research Institute of Standards and Science)
  • Published : 2004.03.31
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Abstract

We have designed and fabricated the YBCO single layer directly-coupled SQUID magnetometers for the purpose of magnetocardiography in a magnetically disturbed environment. The SQUID magnetometers were designed three different types of pickup coil such as solid type, PL type I and PL type II for further stable fluxed-locked-loop operation without magnetic shielding. Magnetometer was fabricated with a single layer YBCO thin film deposited on STO(100) bicrystal substrate with misorientation angle of $30^{\circ}$. We have achieved a magnetic field noise BN of 30 fT/$Hz^{1/2}$ at 100 Hz, and less than 70 fT/$Hz^{1/2}$ at 1 Hz. The PL type II SQUIDs have exhibited the most stable fluxed-locked-loop operation in a magnetically unshielded environment.

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References

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