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

doi:10.1016/j.ndteint.2010.01.004

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 journal › Article › peer-review

30 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 M_mes,i and phase α_i by a lock-in amplifier. Using the strength M_mes,i and phase α_i, 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 language	English
Pages (from-to)	323-328
Number of pages	6
Journal	NDT and E International
Volume	43
Issue number	4
DOIs	https://doi.org/10.1016/j.ndteint.2010.01.004
Publication status	Published - Jun 2010

Keywords

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

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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

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.",

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author = "Keiji Tsukada and Mitsuteru Yoshioka and Yoshihiko Kawasaki and Toshihiko Kiwa",

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AU - Tsukada, Keiji

AU - Yoshioka, Mitsuteru

AU - Kawasaki, Yoshihiko

AU - Kiwa, Toshihiko

PY - 2010/6

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N2 - 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.

AB - 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.

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