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High sensitivity rotating alternating current field measurement for arbitrary-angle underwater cracks
Affiliation:1. Laboratorio de Evaluación No Destructiva Electromagnética (LENDE), ESIME-SEPI, Instituto Politécnico Nacional, UPALM Edif. Z-4, Zacatenco, México D.F. 07738, México;2. Departamento de Ingeniería Metalúrgica, ESIQIE, Instituto Politécnico Nacional, UPALM Edif. 7, Zacatenco, México D.F. 07738, México;1. School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, PR China;2. School of Information and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, PR China;3. School of Electrical and Electronic Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK;4. Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, PR China;1. School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China;2. School of Engineering, Newcastle University, England, UK;3. School of Mechanical Engineering, Sichuan University, Chengdu, 610065, China;4. Infrastructure Inspection Research Institute, China Academy of Railway Sciences Corporation Limited., CARS, Beijing, China;1. Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming, 650500, China;2. School of Electrical and Electronic Engineering, University of Manchester, Manchester, M13 9PL, United Kingdom
Abstract:Alternating current field measurement (ACFM) technology has been used for sizing underwater structure cracks. However, conventional ACFM is more sensitive to cracks perpendicular to the induced current than cracks with other angles. In this paper, a rotating alternating current field measurement (RACFM) method and underwater test system are present for the detection of arbitrary-angle cracks with high sensitivity. The RACFM is proved by simulations and experiments. Arbitrary-angle cracks detection results obtained from ACFM and RACFM have shown that the RACFM method overcomes the limitation of directional detection of ACFM and effectively achieves high detection sensitivity for arbitrary-angle cracks on underwater structures.
Keywords:Offshore oil & gas industry  Rotating alternating current field measurement (RACFM)  Highly sensitive inspection system  Arbitrary-angle crack detection
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