Composite eddy current detection probe based on low-frequency excitation and detection method

The invention discloses a composite eddy current detection probe based on low-frequency excitation and a detection method, and belongs to the technical field of nondestructive detection. On the basis of far-field eddy current detection, the conventional eddy current detection coil is additionally arranged in the shielding structure and shares the same excitation coil with the far-field eddy current, so that the detection of deep defects by the far-field eddy current is not influenced, and the detection precision of upper surface defects can be improved by utilizing the conventional eddy current detection; through the double-layer shielding cover design with the inner layer made of copper and the outer layer made of silicon steel, the high-conductivity copper is influenced by the magnetic field of an exciting coil, induced eddy current can be generated in the material, the magnetic field of the induced eddy current can hinder the propagation of the magnetic field of a direct coupling channel, and the magnetic