An SVM approach with electromagnetic methods to assess metal plate thickness |
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| Affiliation: | 1. Instituto de Telecomunicações, Instituto Superior Técnico, Universidade Técnica de Lisboa, Lisbon, Portugal;2. Czech Technical University in Prague-University Center for Energy, Efficient Buildings, Czech Republic;1. School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, PR China;2. Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment, China University of Mining and Technology, Xuzhou 221116, PR China;3. School of Information and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, PR China;4. School of Electrical and Electronic Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK;1. IST Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal;2. INESC-ID Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento, 1000-029 Lisbon, Portugal;3. IT Instituto de Telecomunicações, 1049-001 Lisbon, Portugal;4. INESC-MN Instituto de Engenharia de Sistemas e Computadores Microsistemas e Nanotecnologias, 1000-029 Lisbon, Portugal;1. CEA LIST, Centre de Saclay, F-91191, Gif-sur-Yvette, France;2. EDF RD, Department MMC, EDF Lab Les Renardieres, 77818, Moret-sur-Loing, France |
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| Abstract: | Eddy current testing (ECT) is a non-destructive technique that can be used in the measurement of conductive material thickness. In this work ECT and a machine learning algorithm (support vector machine – SVM) are used to determine accurately the thickness of metallic plates. The study has been made with ECT measurements on real specimens. At a first stage, a few number of plates is considered and SVM is used for a multi-class classification of the conductive plate thicknesses within a finite number of categories. Several figures of merit were tested to investigate the features that lead to “good” separating hyperplanes. Then, based on a SVM regressor, a reliable estimation of the thickness of a large quantity of plates is tested.Eddy currents are induced by imposing a voltage step in an excitation coil (transient eddy currents – TEC), while a giant magnetoresistance (GMR) is the magnetic sensor that measures the transient magnetic field intensity in the sample vicinity. An experimental validation procedure, including machine training with linear and exponential kernels and classification errors, is presented with sets of samples with thicknesses up to 7.5 mm. |
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| Keywords: | Eddy current testing ECT Giant magneto resistance GMR Transient eddy current Pulsed eddy current Nondestructive testing Support vector machine SVM Thickness measurement |
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