Study on eddy current signal processing algorithms for oxide layer measurement of fuel rods

Eddy current testing has been widely used in oxide layer measurement of fuel rods. However, the measured signal will be interfered by multiple factors due to the limitation of eddy current techniques. The emphasis of this paper is to eliminate these interference signals. A variety of signal processing algorithms are presented in this paper, with linear fitting algorithm for correcting the signal drift, with grid filtering algorithm and amplitude-limiting filtering algorithm for eliminating the grid signals and other spike signals, with Savitzky-Golay filtering algorithm for smoothing the signal. All the processing algorithms were simulated in MATLAB with a view to demonstrate the feasibility. The simulation results indicate that these algorithms are effective and practical.