A novel eddy current testing probe suitable to the inspection of thick structures

Ladislav Janousek, Zhenmao Chen, Noritaka Yusa, Kenzo Miya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study develops a novel eddy current testing probe that can considerably reduce a drawback caused by the skin effect, on the basis of the new excitation system proposed by the authors. The key idea of the new excitation system is the suppression of eddy current density on the surface of a specimen using superpositioned phase-shifted excitation fields. The probe consists of four coaxial rectangular exciters; the phase and the density of exciting currents in the exciters are adjusted so that density of induced eddy currents on the surface is suppressed, whereas that at the depths of the specimen remains as unchanged as possible. Experimental verifications and numerical simulations are performed to evaluate the efficiency of the new probe. The results show that the new probe indeed realizes deep penetration of induced eddy currents, and provides 20% difference between signals due to 15 mm deep near-side notch and those due to 20 mm deep one although an exciting frequency of 10 kHz is applied.

Original languageEnglish
Title of host publicationNDT in Progress
Subtitle of host publication3rd International Workshop of NDT Experts, Proceedings
PublisherBrno University of Technology
ISBN (Print)8021429968, 9788021429963
Publication statusPublished - 2005 Jan 1
Externally publishedYes
EventNDT in Progress: 3rd International Workshop of NDT Experts 2005 - Prague, Czech Republic
Duration: 2005 Oct 102005 Oct 12

Publication series

NameNDT in Progress: 3rd International Workshop of NDT Experts, Proceedings

Other

OtherNDT in Progress: 3rd International Workshop of NDT Experts 2005
Country/TerritoryCzech Republic
CityPrague
Period05/10/1005/10/12

Keywords

  • Deep defects
  • Depth of penetration
  • Eddy current testing
  • Thick structures

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

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