Optimization of pick-up coils for weakly damped SQUID gradiometers

• 来源期刊: 中国物理B（英文版）
• 关键词: superconducting quantum interference device (SQUID) gradiometer spatial resolution dipole sensitivity signal-to-noise ratio
• 年，卷（期）: 2018,（5）
• 页码范围: 137-142
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/5/050701

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.