Development of eddy current testing system using HTS-SQUID on a hand cart for detection of fatigue cracks of steel plate used in expressways

Akira Tsukamoto, Tsunehiro Hato, Seiji Adachi, Yasuo Oshikubo, Keiji Tsukada, Keiichi Tanabe

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We have been developing an HTS-SQUID eddy current testing (ECT) system using an HTS-SQUID module and external pickup coil made of Bi-2223 tape to investigate the feasibility of non-destructive evaluation of a steel plate paved with asphalt. In this work, a new excitation coil intended as a current dipole source is designed and evaluated. The current dipole coil can be expected to generate a unidirectional excitation field and exhibit small field decay by distance, and thus seems suitable for a measurement under a long liftoff condition such as the case for crack detection through an asphalt pavement. It is also found that a strong single peak appears just above a slit hole as a simulated crack by applying the excitation field using a tilted current dipole coil. The developed measurement system was mounted on a hand cart, and successful detection of a 50 mm long slit hole and its stable operation were demonstrated in a field operation test.

Original languageEnglish
JournalIEEE Transactions on Applied Superconductivity
DOIs
Publication statusAccepted/In press - Jan 18 2018

Keywords

  • Asphalt
  • current dipole
  • Current measurement
  • eddy current testing
  • excitation coil
  • fatigue crack
  • HTS-SQUID
  • Magnetic field measurement
  • Magnetic fields
  • Magnetic flux
  • SQUIDs
  • Steel
  • steel plate

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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