Pulse-modulation eddy current probes for imaging of external corrosion in nonmagnetic pipes |
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| Affiliation: | 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. Jiangxi Province Key Laboratory of Precision Drive & Control, Nanchang Institute of Technology, Nanchang 330099, China;2. State Key Laboratory of Industrial Control Technology, Department of Control Science & Engineering, Zhejiang University, Hangzhou 310027, China;3. Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang 360063, China;1. School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, PR China;2. Hypervelocity Aerodynamics Institute, China Aerodynamics Research & Development Center, Mianyang 621000, PR China;3. Key Lab for IOT and Information Fusion Technology of Zhejiang, Hangzhou Dianzi University, Zhejiang 310018, PR China;4. Department of Computer and Information Science, University of Macau, PR China;5. Department of Electromechanical Engineering, University of Macau, PR China;1. The key laboratory for advanced food manufacturing equipment technology of Jiangsu province, Wuxi, 214122, China;2. School of Mechanical Engineering, Jiangnan University, Wuxi, 214122, China;3. College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China;4. National Center of Quality Supervision and Inspection for Commodity, Yiwu, 322000, China;1. State Key Laboratory for Strength and Vibration of Mechanical Structures, Shanxi Engineering Research Center for NDT and Structural Integrity, Xi’an Jiaotong University, Xi’an 710049, China;2. Innovative Energy Research Center, Institute of Fluid Science, Tohoku University, Aoba-ku, Sendai 980-8577, Japan;1. Department of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, South Korea;2. Niclear Materials Development Division, Kroea Atomic Energy Research Institute, Daejeon 34057, South Korea;3. Department of Physica and Electronics, GITAM University, Visakhapatnam, Andhra Pradesh 530045, India;1. School of Automation Engineering, University of Electronic Science and Technology of China, China;2. School of Electrical and Electronic Engineering, Newcastle University, UK |
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| Abstract: | Since the nonmagnetic pipe is normally utilized in corrosive and hostile environment, it is prone to the external corrosion which occurs on the outer surface of the pipe and severely undermines the structural integrity and safety. Although Pulsed Eddy Current technique (PEC) is currently preferred for detection and evaluation of subsurface defects in tubular conductors, it is subject to technical drawbacks. In light of this, Pulse-modulation Eddy Current technique (PMEC) is intensively investigated in the paper for enhancement of the evaluation sensitivity to external corrosion and accuracy of corrosion imaging. Closed-form expressions of the PMEC response and its sensitivity to external corrosion in tubular conductors are formulated via the Extended Truncated Region Eigenfunction Expansion (ETREE) modeling. Following simulations for analysis and comparison of field signals and evaluation sensitivities of PMEC and PEC, experiments of PMEC for evaluation and imaging of external corrosion are carried out. Through theoretical and experimental investigation, it has been found that regarding the evaluation and imaging of external corrosion in nonmagnetic pipes, the PMEC-based probe have higher sensitivity and imaging accuracy than that based on PEC. The superiority of PMEC to PEC in inspection of tubular conductors is further identified. |
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| Keywords: | Electromagnetic non-destructive evaluation Pulse-modulation eddy current technique Tubular conductor Corrosion imaging Sensitivity analysis |
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