Eddy current testing is a widely used nondestructive testing (NDT) method, particularly for inspecting the heat-exchanger tubes in steam generators. Due to the complex nature of the eddy current technique, the analysis of such inspection data is a difficult task which requires a huge amount of work by experienced human analysts [1]. This is time consuming and expensive. Human nature itself will cause some variance in analysis. Also, the variation of many different properties in the eddy current signal makes it very difficult to analyze. To overcome these obstacles, an eddy current automatic analysis system is needed to aid the analysts.
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