Note: low temperature superconductor superconducting quantum interference device system with wide pickup coil for detecting small metallic particles.

Abstract

A one-channel low temperature superconductor superconducting quantum interference device system comprising a second-order axial gradiometer with a sensing area of 10 mm × 190 mm was developed. The gradiometer was mounted in a liquid-helium dewar (450-mm diameter; 975-mm length), with a gap of 12 mm between the pickup coil and the dewar-tail surface. The magnetic field sensitivity was measured to be 16 fT/Hz(1/2) in the white noise regime above 2 Hz. The system was used to measure stainless steel particles of different sizes passing through the sensing area. A 100-μm diameter SUS304 particle was readily detected passing at different positions underneath the large pickup coil by measuring its 1.3-pT magnetic field. Thus, the system was shown to be applicable to quality control of lamination sheet products such as lithium ion batteries.

DOI: 10.1063/1.4739311

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Cite this paper

@article{Kandori2012NoteLT, title={Note: low temperature superconductor superconducting quantum interference device system with wide pickup coil for detecting small metallic particles.}, author={Akihiko Kandori and Kuniomi Ogata and Ryuzo Kawabata and Sayaka Tanimoto and Yusuke Seki}, journal={The Review of scientific instruments}, year={2012}, volume={83 7}, pages={076108} }