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《Journal of Zhejiang University(Engineering Science)》 2009-09
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Analytical modeling for pulsed eddy current testing

FAN Meng-bao,HUANG Ping-jie,YE Bo,HOU Di-bo,ZHANG Guang-xin,ZHOU Ze-kui(State Key Laboratory of Industrial Control Technology,Zhejiang University,Hangzhou 310027,China)  
Analytical modeling for response of differential probes placed above arbitrary number of parallel nonferrous stratified conductive structures for pulsed eddy current(PEC) testing was studied.The closed-form solution to the impedance of probe supplied with harmonic excitation was presented.Then the model was transformed from double integral into definite one for significant reduction in computation time.The finite Fourier series expansion was formulated to approximate the pulse excitation and the equivalent bridge circuit of differential probes was developed in order to apply superposition principle for simulating the response of differential probes driven by voltage pulse.Simulations and experiments on thickness of nonferrous conductive specimen were conducted to verify the model.The calculated results agreed with the measured results.Results show that the developed model is effective.The model can be used to grasp the essence of PEC testing,create a simulator of probe response and improve the inverse algorithms.
【Fund】: 国家自然科学基金资助项目(50505045);; 国家教育部博士点基金资助项目(200803350058)
【CateGory Index】: TH878
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