A Statistical Model for Eddy‐Current Signals from Steam Generator Tubes

Date
2004-01-01
Authors
Dogandžić, Aleksandar
Xiang, Ping
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Abstract

We propose a model for characterizing amplitude and phase probability distributions of eddy‐current signals. The squared amplitudes and phases of the potential defect signals are modeled as independent, identically distributed (i.i.d.) random variables following gamma and von Mises distributions, respectively. We derive a maximum likelihood (ML) method for estimating the amplitude and phase distribution parameters from measurements corrupted by additive complex white Gaussian noise. Newton‐Raphson iteration is utilized to compute the ML estimates of the unknown parameters. The obtained estimates can be used for flaw detection as well as efficient feature extractors in a defect classification scheme. Finally, we apply the proposed method to analyze rotating‐probe eddy‐current data from tube inspection of a steam generator in a nuclear power plant.

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The following article appeared in AIP Conference Proceedings 700 (2004): 605 and may be found at doi:10.1063/1.1711677.

Keywords
Nuclear data analysis, nuclear power, probability theory, signal generators, statistical model calculations
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