Simulation study of orthogonal eddy current excitation technique for detection of multi-orientation slit
Identifying crack propagation direction and depth is crucial for steel structure safety. This study explores an orthogonal eddy current excitation technique for detecting multi-orientation slits in mild steels. Using 3-D finite element (FE) simulation, the normal magnetic response Bz distributio...
| Main Authors: | , , , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
IEEE
2024
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/44383/ http://umpir.ump.edu.my/id/eprint/44383/1/2024%20Simulation%20Study%20of%20Orthogonal%20Eddy%20Current%20Excitation%20Technique%20for%20Detection%20of%20Multi-O.pdf |
| Summary: | Identifying crack propagation direction and depth
is crucial for steel structure safety. This study explores an
orthogonal eddy current excitation technique for detecting
multi-orientation slits in mild steels. Using 3-D finite element
(FE) simulation, the normal magnetic response Bz distribution
induced by orthogonal eddy current excitation is calculated.
Two perpendicular inductor arrays mimic orthogonal eddy
currents. Artificial vertical, horizontal, 45°, and cross slits on a
12-mm mild steel plate are modeled, and the normal magnetic response contributed by these slits is simulated. Findings show that the orthogonal eddy current excitation technique causes a change in the magnetic field distribution for all types of slits, indicating its ability to resolve any orientation of the slits. Both x- and y-differential signals exhibit similar sensitivity in detecting vertical and horizontal slits. In contrast to the real component of the differential signal, the imaginary components showed a higher normalized differential value due to slits, suggesting a higher detection sensitivity of the differential imaginary components. The orthogonal eddy current induction technique would be a preferable choice to be implemented in an ECT probe. |
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