Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 170, Issue 1-2, Pages 55-61Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2011.05.031
Keywords
Magnetic flux leakage; Giant magneto-impedance sensor; Crack detection; Theoretical dipole model
Funding
- Iran Oil Terminals Company [88.038.100.0010]
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Magnetic flux leakage inspection is one of the most common nondestructive techniques used to detect crack-like defects in ferromagnetic materials. In order to improve the accuracy and reliability of crack detection, sensors based on the giant magneto-impedance (GMI) effect are suitable candidates for the magnetic sensors used in MFL detection systems. In this paper, we have introduced a double-core GMI sensor based on Co-based amorphous wires for the detection of rectangular shaped surface cracks. A theoretical method compared with experimental measurements indicates that an increase in the crack dimension is observed via an increase in the sensor signal amplitude. Magnetic imaging of different cracks shows that there is a good correlation between the size and position of cracks and the sensor signals: which can lead to improvement of the MFL test industry. (C) 2011 Elsevier B.V. All rights reserved.
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