Subsurface corrosion in conductive structures severely influences the structural integrity. It is of great significance to carry out noninvasive evaluation of subsurface corrosion via effective nondestructive evaluation techniques. Gradient-field Pulsed Eddy Current technique (GPEC) has exhibited its feasibility in detection and evaluation of corrosion in conductors. Following previous investigation, in this paper a novel GPEC probe inducing net magnetic field of high Degree of Field Uniformity (DFU) is proposed for quantitative evaluation and imaging of subsurface corrosion. A 2D finite element model of the proposed probe is established to analyze the characteristics and DFU of the net magnetic field. Experiments regarding subsurface corrosion imaging via GPEC have been conducted. It has been found that the proposed probe is advantageous in terms of corrosion-edge recognition and evaluation of corrosion opening size. The corrosion depth can further be assessed by the derived images from the integral-based image processing algorithm.
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