Utilization of two-directional AC current distribution for enhancing sizing ability of electromagnetic nondestructive testing methods

Ladislav Janousek, Noritaka Yusa, Kenzo Miya

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

This paper proposes a novel method for accurately evaluating the depth of a defect using electromagnetic phenomena. The novel method induces AC currents inside a conductive medium and detects the disturbance of the currents. Whereas the principle itself has been utilized in conventional methods, the uniqueness of this new method lies in realizing a current distribution in which there is a region where currents near the surface and those deeply inside the specimen flow opposite to each other. The novel method provides a clear indication corresponding to the depth of the inspected defect. In addition, it enables one to evaluate the depth of a defect that is much deeper than the depth of penetration. After the physical background of this new method is explained, the results of experimental verifications and subsequent numerical simulations are presented.

Original languageEnglish
Pages (from-to)542-546
Number of pages5
JournalNDT and E International
Volume39
Issue number7
DOIs
Publication statusPublished - 2006 Oct
Externally publishedYes

Keywords

  • Depth evaluation
  • Eddy current testing
  • Nondestructive evaluation
  • Potential drop testing
  • Skin depth

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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