Superposition of several phase-shifted exciting fields for crack evaluation

Ladislav Janousek, Noritaka Yusa, Kenzo Miya

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Citation (Scopus)


The paper proposes a novel method for crack evaluation based on electromagnetic induction phenomenon. The principle of the method is to realize a unique distribution of induced eddy currents by superposition of several phase-shifted exciting electromagnetic fields. The ratio of the superposition is varied to inspect a crack using different distributions of eddy currents without changing the frequency. Numerical and experimental results reveal that the method provides clear indication about the depth of cracks. In addition, the method is applicable even for cracks which are much deeper than the standard depth of penetration.

Original languageEnglish
Title of host publicationElectromagnetic Nondestructive Evaluation (X)
Number of pages8
Publication statusPublished - 2007

Publication series

NameStudies in Applied Electromagnetics and Mechanics
ISSN (Print)1383-7281
ISSN (Electronic)1879-8322


  • defect depth evaluation
  • eddy currents
  • Electromagnetic induction
  • phase-shifted fields
  • superposition


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