Estimation of surface crack dimensional characteristics by an eddy current method using a single magnetic tunnel junction device

Zhenhu Jin, Masahiko Abe, Mikihiko Oogane, Kousuke Fujiwara, Yasuo Ando

研究成果: Article査読

4 被引用数 (Scopus)

抄録

Eddy current testing plays a significant role in detecting surface defects in a nondestructive testing field. The magnetoresistive sensors based on magnetic tunnel junction devices attracted considerable attention for their use in eddy current testing owing to their high sensitivity and capability of being miniaturized. We investigated the detection of surface cracks in eddy current testing using a single magnetic tunnel junction. A perpendicular component with a secondary magnetic field from an eddy current was measured by using an optimized rectangular magnetic tunnel junction device with an aspect ratio of 4 (20 × 80μm2). Furthermore, according to the extracted ΔX and ΔV from the sensor output signal, surface cracks with various widths (0.1, 0.3, and 0.5 mm) and depths (0.5, 1.0, 1.5, and 3.0 mm) in aluminum specimens were successfully estimated using the magnetic tunnel junction device in eddy current testing when an excitation frequency of 1000Hz was used.

本文言語English
論文番号073001
ジャーナルJapanese journal of applied physics
56
7
DOI
出版ステータスPublished - 2017 7

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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