Eddy current testing utilizing cooled normal pickup coil and superconducting quantum interference device picovoltmeter

Tong Qing Yang, Kenichiro Yao, Daisuke Yamasaki, Keiji Enpuku

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

An eddy current probe utilizing a cooled normal pickup coil and a high-Tc superconducting quantum interference device (SQUID) picovoltmeter was developed. The pickup coil could be moved in an unshielded environment, during which the signal voltage across the pickup coil was transferred to the SQUID picovoltmeter, which was fixed in a cylindrical magnetic shield. By moving the pickup coil, we successfully detected a small crack on the back surface of a Cu plate in the unshielded environment. The dependences of the detected signal on the excitation frequency and thickness of the Cu plate were clarified. The frequency dependence could be used to estimate the depth of the crack from the surface of the Cu plate.

Original languageEnglish
Pages (from-to)L1128-L1130
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume44
Issue number33-36
DOIs
Publication statusPublished - Aug 26 2005

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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