Mohd Mawardi, Saari and Mohd Aufa Hadi Putera, Zaini and Mohd Herwan, Sulaiman and Ahmad Salihin, Samsudin and Kiwa, Toshihiko (2024) Defect evaluation in mild steel plate using harmonic ratio induced by square wave excitation field and nonlinear magnetization. IEEE Transactions on Magnetics. pp. 1-5. ISSN 0018-9464. (In Press / Online First) (In Press / Online First)
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Abstract
Similar to multi-frequency techniques in eddy current and magnetic flux leakage testings, the harmonic evaluation technique using a square wave excitation field improves the defect detection performance of conductive materials compared to single-frequency techniques. However, in the case of mild steel, its nonlinear frequency-dependant magnetization impacts the intensity and phase of the induced harmonics. In this work, we propose a harmonic ratio technique using a square wave excitation field to enhance defect detection in mild steel. A custom-made probe with a planar differential tunnel magnetoresistance sensor and inductor arrays was developed to assess the harmonic responses induced by artificial slits on a 12-mm mild steel. The harmonic dependency on the slit depth, excitation frequency, and intensity was evaluated. The results showed that the ratio of the two highest harmonics exhibited a correlation with slit depth, accompanied by a significant reduction in baseline signal drift as compared to the single-frequency detection mode. It was shown that the proposed harmonic ratio technique, leveraging a square wave excitation field, significantly enhances sensitivity and immunity to background signal drift, thereby improving defect detection capabilities in mild steel.
| Item Type: | Article |
|---|---|
| Additional Information: | Indexed by Scopus |
| Uncontrolled Keywords: | Eddy current; Harmonic analysis; harmonics; Inductors; Magnetic resonance imaging; Magnetization; Mild steel; Permeability; Probes; Square wave; Steel; Tunnel magnetoresistance |
| Subjects: | H Social Sciences > HD Industries. Land use. Labor Q Science > Q Science (General) T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Faculty/Division: | Faculty of Industrial Sciences And Technology Institute of Postgraduate Studies Faculty of Electrical and Electronic Engineering Technology |
| Depositing User: | Mr Muhamad Firdaus Janih@Jaini |
| Date Deposited: | 30 Sep 2024 04:50 |
| Last Modified: | 30 Sep 2024 04:50 |
| URI: | http://umpir.ump.edu.my/id/eprint/42134 |
| Download Statistic: | View Download Statistics |
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