Differential far-field eddy current detection probe and detection method for seawater pipeline corrosion

The invention provides a differential far-field eddy current detection probe for seawater pipeline corrosion and a detection method, the differential far-field eddy current detection probe comprises an external shell, a main shielding layer, an excitation unit and a receiving unit, an opening is formed in the top/bottom surface of the external shell, the main shielding layer is limited in the external shell through a spring, and the bottom surface of the main shielding layer is exposed from the opening in the bottom surface of the external shell; the excitation unit is arranged in the middle of the bottom of the main shielding layer, the receiving unit comprises two independent subunits which are respectively arranged on the bottom surface of the main shielding layer, and the two independent subunits and the excitation unit form a symmetrical distribution state; the differential far-field eddy current detection probe can be used for scanning from the outer wall surface of the pipeline to detect the defects of