High-sensitivity detection probe with magnetic shielding layer based on alternating-current and direct-current composite excitation

The utility model provides a high-sensitivity detection probe with a magnetic shielding layer based on alternating-current and direct-current composite excitation. The high-sensitivity detection probe comprises a fixing screw, a gland, a signal processing circuit, U-shaped soft iron, a large magnetic shielding layer, a small magnetic shielding layer, an alternating-current excitation module, a direct-current excitation module, a TMR magnetic sensor, a soft rigid brush, a Remo connector and a shell. The TMR magnetic sensor is installed at the bottom of the shell, and the alternating current excitation module is installed over the TMR magnetic sensor and comprises a magnet exciting coil and a U-shaped magnetic core. The DC excitation module comprises two permanent magnets, the upper ends of the two permanent magnets are connected with U-shaped soft iron to form a magnetic loop, and the lower ends of the two permanent magnets are connected with a soft rigid brush to guide a magnetic field generated by the DC exc