Magnetic field shielding technique for pulsed remote field eddy current inspection of planar conductors |
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| Affiliation: | 1. School of Information and Navigation, Air Force Engineering University, Xi''an 710077, China;2. Key Laboratory of Nondestructive Testing (Nanchang Hangkong University), Ministry of Education, Nanchang 330063, China;3. College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China;1. Department of Civil and Architecture Engineering, Changsha University, Changsha 410022, PR China;2. College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, PR China;1. State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Centre of NDT and Structural Integrity Evaluation, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China;2. Leading Edge NDT Technology (LENDT) Group, Malaysian Nuclear Agency, 43000 Bangi, Kajang, Selangor, Malaysia;1. State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Center of NDT and Structural Integrity Evaluation, School of Aerospace, Xi’an Jiaotong University, ShaanXi, Xi’an 710049, China;2. AECC Shanghai Commercial Aircraft Manufacturing Co., Ltd., Shanghai, China;1. Research centre for inspection and evaluation of nuclear structural integrity, State key laboratory for strength and vibration of mechanical structures, School of Aerospace, Xi''an Jiaotong University, ShaanXi, Xi''an 710049, China;2. School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China;1. School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China;2. The Key Laboratory for Advanced Food Manufacturing Equipment Technology of Jiangsu Province, Wuxi 214122, China;3. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China |
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| Abstract: | Pulsed remote field eddy current (PRFEC) can be used for detection of deeply buried flaws in non-magnetic flat plates. However, detection sensitivity for buried defect is low due to the great depth and the weak detecting signal. To improve the defect detection sensitivity, the PRFEC probe is optimized with the magnetic field shielding techniques in this work. On one hand, the exciting coil with shielding structure can focus the indirect magnetic field to penetrate through the plate. On the other hand, the detecting coil and the region between these two coils with shielding material can block and minimize the magnetic field energy diffusion along the direct coupling path. In order to investigate the shielding technique which blocks the direct coupling magnetic field, simulation studies using finite element method (FEM) has been first conducted, where three different PRFEC probes have been simulated and compared. Both detection abilities to defects in different directions and to thickness variation have been analyzed by using the second probe with shielding structure. The conclusions derived from the simulation study have been validated through experimental studies. Both simulation and experimental studies have indicated that the shielding technique can improve the detection sensitivity of subsurface defects. |
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| Keywords: | Pulsed remote field eddy current Magnetic field shielding Direct coupling component Non-magnetic conductive plate Finite element |
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