{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,5]],"date-time":"2026-02-05T23:33:32Z","timestamp":1770334412697,"version":"3.49.0"},"reference-count":28,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2022,3,25]],"date-time":"2022-03-25T00:00:00Z","timestamp":1648166400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003819","name":"Natural Science Foundation of Hubei Province","doi-asserted-by":"publisher","award":["2021CFB290"],"award-info":[{"award-number":["2021CFB290"]}],"id":[{"id":"10.13039\/501100003819","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52105550"],"award-info":[{"award-number":["52105550"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>DC magnetization is generally considered to suppress the usual local magnetic permeability variation and increase the penetration depth for magnetizing-based eddy current testing (MB-ECT) of ferromagnetic materials. In fact, such simple explanations lead to rough nondestructive evaluation and cause new neglected non-uniform magnetic characteristics. Hence, the \u201cperturbation\u201d of the internal magnetic field variation is analyzed using a magnetic dipole model and the mechanism of magnetic permeability perturbation in MB-ECT is revealed. The theoretical analysis and simulations show that a significant permeability perturbation always appears around a defect and presents opposite features with strong and weak magnetization. Furthermore, experimental results indicate that the hidden signal component arising from the local permeability perturbation is critical for both far-side surface and near-side surface defects in the MB-ECT method.<\/jats:p>","DOI":"10.3390\/s22072503","type":"journal-article","created":{"date-parts":[[2022,3,24]],"date-time":"2022-03-24T23:31:43Z","timestamp":1648164703000},"page":"2503","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Mechanism of Magnetic Permeability Perturbation in Magnetizing-Based Eddy Current Nondestructive Testing"],"prefix":"10.3390","volume":"22","author":[{"given":"Zhiyang","family":"Deng","sequence":"first","affiliation":[{"name":"Key Laboratory of Modern Manufacture Quality Engineering, Hubei University of Technology, Wuhan 430068, China"}]},{"given":"Zhiheng","family":"Yu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Modern Manufacture Quality Engineering, Hubei University of Technology, Wuhan 430068, China"}]},{"given":"Zhongyu","family":"Yuan","sequence":"additional","affiliation":[{"name":"Key Laboratory of Modern Manufacture Quality Engineering, Hubei University of Technology, Wuhan 430068, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8339-4441","authenticated-orcid":false,"given":"Xiaochun","family":"Song","sequence":"additional","affiliation":[{"name":"Key Laboratory of Modern Manufacture Quality Engineering, Hubei University of Technology, Wuhan 430068, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2622-4769","authenticated-orcid":false,"given":"Yihua","family":"Kang","sequence":"additional","affiliation":[{"name":"School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"}]}],"member":"1968","published-online":{"date-parts":[[2022,3,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"34","DOI":"10.1016\/j.ndteint.2019.03.008","article-title":"NDT and E International A feasibility analysis on the application of eddy current testing to the detection of the most detrimental defects in historical metallic tie-rods \u2606","volume":"104","author":"Bellanova","year":"2019","journal-title":"NDT E Int."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"43","DOI":"10.1016\/j.ndteint.2016.10.001","article-title":"Evaluation of the lift-off robustness of eddy current imaging techniques","volume":"85","author":"Ricci","year":"2017","journal-title":"NDT E Int."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"48","DOI":"10.1016\/j.ndteint.2016.02.009","article-title":"2D surface defect images applying Tikhonov regularized inversion and ECT","volume":"80","author":"Pasadas","year":"2016","journal-title":"NDT E Int."},{"key":"ref_4","first-page":"1","article-title":"Thickness Assessment of Thermal Barrier Coatings of Aeroengine Blades Via Dual-Frequency Eddy Current Evaluation","volume":"7","author":"Li","year":"2017","journal-title":"IEEE Magn. 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