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 Mat Lab 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.
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 Mat Lab 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.
作者
Kang Yang
Jialei Wang
Xiangyan Kong
Ruihu Yang
Hua Chen
杨康;王佳磊;孔祥燕;杨瑞虎;陈桦(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)
基金
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)
the National Natural Science Foundation of China(Grant No.61741122)
