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Extraction Method of Crack Signal for Inspection of Complicated Steel Structures Using A Dual-Channel Magnetic Sensor †
Conventional eddy current testing (ECT) using a pickup coil probe is widely employed for the detection of structural cracks. However, the inspection of conventional ECT for steel structures is difficult because of the magnetic noise caused by the nonuniform permeability of steel. To combat this chal...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6651439/ https://www.ncbi.nlm.nih.gov/pubmed/31288385 http://dx.doi.org/10.3390/s19133001 |
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author | Hayashi, Minoru Saito, Taisuke Nakamura, Yoshihiro Sakai, Kenji Kiwa, Toshihiko Tanikura, Izumi Tsukada, Keiji |
author_facet | Hayashi, Minoru Saito, Taisuke Nakamura, Yoshihiro Sakai, Kenji Kiwa, Toshihiko Tanikura, Izumi Tsukada, Keiji |
author_sort | Hayashi, Minoru |
collection | PubMed |
description | Conventional eddy current testing (ECT) using a pickup coil probe is widely employed for the detection of structural cracks. However, the inspection of conventional ECT for steel structures is difficult because of the magnetic noise caused by the nonuniform permeability of steel. To combat this challenge, we have developed a small magnetic sensor probe with a dual-channel tunneling magnetoresistance sensor that is capable of reducing magnetic noise. Applying this probe to a complicated component of steel structures—such as the welds joining a U-shaped rib and deck plate together—requires the reduction of signal fluctuation caused by the distance (liftoff) variations between the sensor probe and the subject. In this study, the fundamental crack signal and the liftoff signal were investigated with the dual-channel sensor. The results showed that the liftoff signals could be reduced and differentiated from the crack signals by the differential parameters of the dual-channel sensor. In addition, we proposed an extraction technique for the crack signal using the Lissajous curve of the differential parameters. The extraction technique could be applied to the inspections not only for flat plates but also for welded angles to detect cracks without the influence of the liftoff signal. |
format | Online Article Text |
id | pubmed-6651439 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-66514392019-08-08 Extraction Method of Crack Signal for Inspection of Complicated Steel Structures Using A Dual-Channel Magnetic Sensor † Hayashi, Minoru Saito, Taisuke Nakamura, Yoshihiro Sakai, Kenji Kiwa, Toshihiko Tanikura, Izumi Tsukada, Keiji Sensors (Basel) Article Conventional eddy current testing (ECT) using a pickup coil probe is widely employed for the detection of structural cracks. However, the inspection of conventional ECT for steel structures is difficult because of the magnetic noise caused by the nonuniform permeability of steel. To combat this challenge, we have developed a small magnetic sensor probe with a dual-channel tunneling magnetoresistance sensor that is capable of reducing magnetic noise. Applying this probe to a complicated component of steel structures—such as the welds joining a U-shaped rib and deck plate together—requires the reduction of signal fluctuation caused by the distance (liftoff) variations between the sensor probe and the subject. In this study, the fundamental crack signal and the liftoff signal were investigated with the dual-channel sensor. The results showed that the liftoff signals could be reduced and differentiated from the crack signals by the differential parameters of the dual-channel sensor. In addition, we proposed an extraction technique for the crack signal using the Lissajous curve of the differential parameters. The extraction technique could be applied to the inspections not only for flat plates but also for welded angles to detect cracks without the influence of the liftoff signal. MDPI 2019-07-08 /pmc/articles/PMC6651439/ /pubmed/31288385 http://dx.doi.org/10.3390/s19133001 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Hayashi, Minoru Saito, Taisuke Nakamura, Yoshihiro Sakai, Kenji Kiwa, Toshihiko Tanikura, Izumi Tsukada, Keiji Extraction Method of Crack Signal for Inspection of Complicated Steel Structures Using A Dual-Channel Magnetic Sensor † |
title | Extraction Method of Crack Signal for Inspection of Complicated Steel Structures Using A Dual-Channel Magnetic Sensor † |
title_full | Extraction Method of Crack Signal for Inspection of Complicated Steel Structures Using A Dual-Channel Magnetic Sensor † |
title_fullStr | Extraction Method of Crack Signal for Inspection of Complicated Steel Structures Using A Dual-Channel Magnetic Sensor † |
title_full_unstemmed | Extraction Method of Crack Signal for Inspection of Complicated Steel Structures Using A Dual-Channel Magnetic Sensor † |
title_short | Extraction Method of Crack Signal for Inspection of Complicated Steel Structures Using A Dual-Channel Magnetic Sensor † |
title_sort | extraction method of crack signal for inspection of complicated steel structures using a dual-channel magnetic sensor † |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6651439/ https://www.ncbi.nlm.nih.gov/pubmed/31288385 http://dx.doi.org/10.3390/s19133001 |
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