Detection of back-side pit on a ferrous plate by magnetic flux leakage method with analyzing magnetic field vector

Keiji Tsukada, Mitsuteru Yoshioka, Yoshihiko Kawasaki, Toshihiko Kiwa

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We have developed a magnetic flux leakage (MFL) system using magnetic resistive (MR) sensors for detecting two dimensional magnetic field components, and an induction coil that generates low magnetic field strengths and extremely low frequencies. The signal at each scanned measurement point (i) was divided by the signal strength Mmes,i and phase αi by a lock-in amplifier. Using the strength Mmes,i and phase αi, we calculated the imaginary part of the signal using the common phase β. By optimization of the common phase β to the imaginary part, the analyzed scanning data curve was shown to be effective in estimating the size (depth and diameter) of back-side pits on a ferrous plate. Comparing the two dimensional magnetic field components of leakage, the imaginary part of the y-component parallel to the induced magnetic field was found to be suitable for detecting the back-side pits.

Original languageEnglish
Pages (from-to)323-328
Number of pages6
JournalNDT and E International
Volume43
Issue number4
DOIs
Publication statusPublished - Jun 2010

Fingerprint

Magnetic flux
magnetic flux
leakage
Magnetic fields
magnetic fields
extremely low frequencies
field strength
induction
estimating
coils
amplifiers
Scanning
optimization
scanning
sensors
Sensors
curves

Keywords

  • Low-frequency magnetic field
  • Magnetic flux leakage
  • Magneto-resistive sensor

ASJC Scopus subject areas

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

Cite this

Detection of back-side pit on a ferrous plate by magnetic flux leakage method with analyzing magnetic field vector. / Tsukada, Keiji; Yoshioka, Mitsuteru; Kawasaki, Yoshihiko; Kiwa, Toshihiko.

In: NDT and E International, Vol. 43, No. 4, 06.2010, p. 323-328.

Research output: Contribution to journalArticle

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