Controlling alternating current distribution inside conductive material leads to a novel volumetric examination method - Experimental verification

Noritaka Yusa, Ladislav Janousek, Kenzo Miya

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This paper experimentally demonstrates that controlling alternating current distribution inside conductive material enables one to perform volumetric examinations using electromagnetic phenomena. Several current distributions are superposed to locally realize a unique alternating current distribution having a phase difference of 180 degrees between currents flowing near the surface and those deep inside, while having non-exponential decay in depth direction. Experimental results clearly show that measuring the phase of magnetic field outside the material as a function of the ratio of the superposition provides quantitative information about the depth of defects. In addition, this approach is applicable even though the depth of defects is much deeper than the standard depth of penetration; experimental results show clear differences between signals due to near-side notches of 10, 12, 15, and 20mm deep, when an exciting frequency of 100kHz is adopted.

Original languageEnglish
Pages (from-to)1162-1165
Number of pages4
JournalMaterials Transactions
Volume48
Issue number6
DOIs
Publication statusPublished - 2007 Jun

Keywords

  • Alternating current
  • Defect depth evaluation
  • Electromagnetic nondestructive evaluation
  • Phase lag
  • Sizing
  • Skin depth

ASJC Scopus subject areas

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

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