ID | 64275 |
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Adachi, Shoya
Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University
Hayashi, Minoru
Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University
Kawakami, Taisei
Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University
Ando, Yuto
Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University
Wang, Jin
Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University
Sakai, Kenji
Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University
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Kiwa, Toshihiko
Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University
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Ishikawa, Toshiyuki
Department of Civil, Environmental and Applied System Engineering, Faculty of Environmental and Urban Engineering, Kansai University
Tsukada, Keiji
Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University
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Abstract | Infrastructure facilities that were built approximately half a century ago have rapidly aged. Steel sheet piles, the inspection object in this study, are severely corroded, resulting in cave-in damages at wharfs. To solve such a problem, non-destructive inspection techniques are required. We previously demonstrated plate thickness measurement using extremely low-frequency eddy current testing. However, when the steel sheet piles are located in water, shellfish adhere to their surface, causing a lift-off of several tens of millimeters. Therefore, this large lift-off hinders the thickness measurement owing to fluctuations of magnetic signals. In this study, sensor probes with different coil diameters were prototyped and the optimum size for measuring steel sheet piles at high lift-off was investigated. Using the probes, the magnetic field was applied with a lift-off range from 0 to 80 mm, and the intensity and phase of the detected magnetic field were analyzed. Subsequently, by increasing the probe diameter, a good sensitivity was obtained for the thickness estimation with a lift-off of up to 60 mm. Moreover, these probes were used to measure the thickness of actual steel sheet piles, and measurements were successfully obtained at a high lift-off.
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Keywords | eddy current testing
high lift-off thickness measurement
magnetic sensor
corrosion
underwater steel structure
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Published Date | 2022-12-29
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Publication Title |
Sensors
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Volume | volume23
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Issue | issue1
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Publisher | MDPI
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Start Page | 380
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ISSN | 1424-8220
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Content Type |
Journal Article
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language |
English
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OAI-PMH Set |
岡山大学
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Copyright Holders | © 2022 by the authors.
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File Version | publisher
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Related Url | isVersionOf https://doi.org/10.3390/s23010380
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License | https://creativecommons.org/licenses/by/4.0/
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