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

被引：9
|
作者：
Jin, Zhenhu [1 ]
Abe, Masahiko [1 ]
Oogane, Mikihiko [1 ]
Fujiwara, Kousuke [1 ]
Ando, Yasuo [1 ]
机构：
[1] Tohoku Univ, Dept Appl Phys, Sendai, Miyagi 9808579, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2017年 / 56卷 / 07期
基金：
日本科学技术振兴机构;
关键词：
GIANT MAGNETORESISTANCE; SENSOR; INSPECTION;
D O I：
10.7567/JJAP.56.073001
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 x 80 mu m(2)). Furthermore, according to the extracted Delta X and Delta V 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 3.0mm) in aluminum specimens were successfully estimated using the magnetic tunnel junction device in eddy current testing when an excitation frequency of 1000 Hz was used. (C) 2017 The Japan Society of Applied Physics
引用
收藏
页码：1 / 5
页数：5
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