Two-Dimensional Eddy Current Signal Enhancement via Multifrequency Data Fusion

Abstract

Abstract Eddy current testing is one of the most popular nondestructive testing methods; a multifrequency testing is often applied to cancel the unwanted signals to improve the signal-to-noise ratio. This is usually accomplished by combining the results obtained at different frequencies in the spatial domain. In this paper a fusion strategy to integrate two-dimensional, multifrequency signals is introduced, which is based on the multiresolution analysis method. A signal-to-noise ratio criteria is adopted to evaluate the fusion results. Finally, the effectiveness of the pyramid method is discussed.