Swept-frequency eddy current testing to characterize a nonmagnetic metallic plate and a nonconductive coating over it

Research output: Contribution to journalArticle

Abstract

In the measurement of a metallic plate's dimension by eddy current testing, the plate's electrical conductivity is required but practically unavailable. This study investigated the application of swept-frequency eddy current testing (SFECT) to measure the thicknesses of the plate and a nonconductive coating over it, even without knowing the plate's conductivity. Hinted by the known analytical expressions available for the calculation of the impedance of an air-cored coil above a plate, we found that the maximum phase angle of the normalized SFECT signal is relevant to the thickness of a conductive plate and the liftoff, regardless of the conductivity, and can be applied to thickness measurement. Analytical and experimental studies also showed that the conductivity of a nonmagnetic plate can be measured nondestructively by using SFECT signals in the high frequency range.

Original languageEnglish
Pages (from-to)1169-1178
Number of pages10
JournalInternational Journal of Applied Electromagnetics and Mechanics
Volume59
Issue number3
DOIs
Publication statusPublished - 2019 Jan 1
Externally publishedYes

Keywords

  • Swept-frequency eddy current testing
  • coating layer
  • conductivity
  • nonmagnetic
  • thickness

ASJC Scopus subject areas

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

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