Investigation of a Magnetic Tunnel Junction Based Sensor for the Detection of Defects in Reinforced Concrete at High Lift-Off

被引:8
|
作者
Sam, Muhamad Arif Ihsan Mohd Noor [1 ,2 ]
Jin, Zhenhu [1 ]
Oogane, Mikihiko [1 ,3 ,4 ]
Ando, Yasuo [1 ,3 ,4 ]
机构
[1] Tohoku Univ, Dept Appl Phys, Sendai, Miyagi 9808579, Japan
[2] Tohoku Univ, Grad Program Spintron, Sendai, Miyagi 9808578, Japan
[3] Tohoku Univ, Ctr Sci & Innovat Spintron, Org Adv Studies, Core Res Cluster, Sendai, Miyagi 9808577, Japan
[4] Tohoku Univ, Ctr Spintron Res Network, Sendai, Miyagi 9808577, Japan
关键词
non-destructive testing; reinforced concrete; lift-off; magnetic tunnel junction sensors; CORROSION;
D O I
10.3390/s19214718
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Magnetic flux leakage (MFL) testing is a method of non-destructive testing (NDT), whereby the material is magnetized, and when a defect is present, the magnetic flux lines break out of the material. The magnitude of the leaked magnetic flux decreases as the lift-off (distance from the material) increases. Therefore, for detection at high lift-off, a sensitive magnetic sensor is required. To increase the output sensitivity, this paper proposes the application of magnetic tunnel junction (MTJ) sensors in a bridge circuit for the NDT of reinforced concrete at high lift-off. MTJ sensors were connected to a full-bridge circuit, where one side of the arm has two MTJ sensors connected in series, and the other contains a resistor and a variable resistor. Their responses towards a bias magnetic field were measured, and, based on the results, the sensor circuit sensitivity was 0.135 mV/mT. Finally, a reinforced concrete specimen with a 1 cm gap in the center was detected. The sensor module (with an amplifier and low pass filter circuits) could determine the gap even at 50 cm, suggesting that MTJ sensors have the potential to detect defects at high lift-off values and have a promising future in the field of NDT.
引用
收藏
页数:10
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