Characterizing of corrosion backside of steel plates using extremely low-frequency eddy current testing with multiple-frequency magnetic-field exposure

Tsuyoshi Goda, Yuta Haga, Takuya Tomioka, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada

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

Abstract

In recent years, aging and deterioration of social infrastructure has become a major problem. A non-destructive testing technique for early detection of degradation (such as internal corrosion) is required to extend the lifetime of these structures. Currently, there are various methods used for inspection. Among these, non-destructive testing using magnetic fields is widely used due to advantages such as ease of use and high speed. However, magnetic inspection is generally employed only for inspection of the surface and subsurface, since it is difficult to inspect internal corrosion using this technique. Therefore, we have developed a device for detecting thinning of steel plates due to corrosion using multiple extremely-low frequencies and a high-sensitivity magnetic sensor. However, it is necessary to sweep multiple frequencies to obtain a frequency spectrum, and this is very timeconsuming, especially in extremely low-frequency ranges. In this study, we have developed an analysis method based on a multiple-frequency applied magnetic field and FFT (fast Fourier transform) analysis of the detection signal. Thus, we have successfully reduced the measurement time while maintaining high detection accuracy.

Original languageEnglish
Title of host publicationElectromagnetic Non-Destructive Evaluation (XXI)
PublisherIOS Press
Pages130-135
Number of pages6
ISBN (Electronic)9781614998358
DOIs
Publication statusPublished - Jan 1 2018
Event22nd International Workshop on Electromagnetic Nondestructive Evaluation, ENDE 2017 - Saclay, France
Duration: Sep 6 2017Sep 8 2017

Publication series

NameStudies in Applied Electromagnetics and Mechanics
Volume43
ISSN (Print)1383-7281
ISSN (Electronic)1879-8322

Other

Other22nd International Workshop on Electromagnetic Nondestructive Evaluation, ENDE 2017
CountryFrance
CitySaclay
Period9/6/179/8/17

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering

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