Transient response of a driver-pickup coil probe in transient eddy current testing |
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| Affiliation: | 1. Department of Physics, Queen׳s University, Kingston, ON, Canada K7L 3N6;2. Department of Physics, Royal Military College of Canada, Kingston, ON, Canada K7K 7B4;1. School of Mechanical, Electronic and Industrial Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Road, Hi-Tech Industrial Development Zone, Chengdu, Sichuan 611731, PR China;2. Shanghai Spaceflight Precision Machinery Research Institute, Shanghai, PR 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 |
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| Abstract: | Novel solutions that correctly incorporate all electromagnetic interactions arising in inductively coupled circuits are presented for the case of a coaxial driver and pickup coil probe encircling a long ferromagnetic conducting rod. The differential circuit equations are formulated in terms of the rod׳s impulse response using convolution theory, and solved by Fourier transform. The solutions presented here are the first to account for feedback between a ferromagnetic conductor and the driver and pickup coils, providing correct voltage response of the coils. Experimental results, obtained for the case of square wave excitation, are in excellent agreement with the analytical equations. |
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| Keywords: | Transient Eddy current Analytical Response |
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