中国物理B ›› 2018, Vol. 27 ›› Issue (5): 50701-050701.doi: 10.1088/1674-1056/27/5/050701

• GENERAL • 上一篇    下一篇

Optimization of pick-up coils for weakly damped SQUID gradiometers

Kang Yang(杨康), Jialei Wang(王佳磊), Xiangyan Kong(孔祥燕), Ruihu Yang(杨瑞虎), Hua Chen(陈桦)   

  1. 1 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology(SIMIT), Chinese Academy of Sciences(CAS), Shanghai 200050, China;
    2 CAS Center for Excellence in Superconducting Electronics(CENSE), Shanghai 200050, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2017-12-25 修回日期:2018-03-02 出版日期:2018-05-05 发布日期:2018-05-05
  • 通讯作者: Xiangyan Kong E-mail:xykong@mail.sim.ac.cn
  • 基金资助:
    Project supported by the Key Project of Shanghai Zhangjiang National Innovation Demonstration Zone of the Special Development Fund,China (Grant No.2015-JD-C104-060) and the National Natural Science Foundation of China (Grant No.61741122).

Optimization of pick-up coils for weakly damped SQUID gradiometers

Kang Yang(杨康)1,2,3, Jialei Wang(王佳磊)1,2,3, Xiangyan Kong(孔祥燕)1,2,3, Ruihu Yang(杨瑞虎)1,2,3, Hua Chen(陈桦)1,2,3   

  1. 1 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology(SIMIT), Chinese Academy of Sciences(CAS), Shanghai 200050, China;
    2 CAS Center for Excellence in Superconducting Electronics(CENSE), Shanghai 200050, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-12-25 Revised:2018-03-02 Online:2018-05-05 Published:2018-05-05
  • Contact: Xiangyan Kong E-mail:xykong@mail.sim.ac.cn
  • Supported by:
    Project supported by the Key Project of Shanghai Zhangjiang National Innovation Demonstration Zone of the Special Development Fund,China (Grant No.2015-JD-C104-060) and the National Natural Science Foundation of China (Grant No.61741122).

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摘要： The performance of a superconducting quantum interference device (SQUID) gradiometer is always determined by its pick-up coil geometry, such as baseline and radius. In this paper, based on the expressions for the coupled flux threading a magnetometer obtained by Wikswo, we studied how the gradiometer performance parameters, including the current dipole sensitivity, spatial resolution and signal-to-noise ratio (SNR), are affected by its pick-up coil via MatLab simulation. Depending on the simulation results, the optimal pick-up coil design region for a certain gradiometer can be obtained. To verify the simulation results, we designed and fabricated several first-order gradiometers based on the weakly damped SQUID with different pick-up coils by applying superconducting connection. The experimental measurements were conducted on a simple current dipole in a magnetically shielding room. The measurement results are well in coincidence with the simulation ones, indicating that the simulation model is useful in specific pick-up coil design.

关键词: superconducting quantum interference device (SQUID) gradiometer, spatial resolution, dipole sensitivity, signal-to-noise ratio

Abstract: The performance of a superconducting quantum interference device (SQUID) gradiometer is always determined by its pick-up coil geometry, such as baseline and radius. In this paper, based on the expressions for the coupled flux threading a magnetometer obtained by Wikswo, we studied how the gradiometer performance parameters, including the current dipole sensitivity, spatial resolution and signal-to-noise ratio (SNR), are affected by its pick-up coil via MatLab simulation. Depending on the simulation results, the optimal pick-up coil design region for a certain gradiometer can be obtained. To verify the simulation results, we designed and fabricated several first-order gradiometers based on the weakly damped SQUID with different pick-up coils by applying superconducting connection. The experimental measurements were conducted on a simple current dipole in a magnetically shielding room. The measurement results are well in coincidence with the simulation ones, indicating that the simulation model is useful in specific pick-up coil design.

Key words: superconducting quantum interference device (SQUID) gradiometer, spatial resolution, dipole sensitivity, signal-to-noise ratio

中图分类号:  (Magnetometers for magnetic field measurements)

  • 07.55.Ge
85.25.Am (Superconducting device characterization, design, and modeling) 85.25.Dq (Superconducting quantum interference devices (SQUIDs)) 87.55.de (Optimization)