Aiming at the difficult problem of high-precision magnetic field signal measurement and target size and orientation detection in geophysical exploration,a superconducting single-channel magnetometer based on SQUID sensor is researched and fabricated.Firstly,the working principle of superconducting magnetometer is introduced,and its overall structure frame,control unit,XYZ unit,non-magnetic Dewar bottle and power supply module are mainly designed.Then an adaptive filtering algorithm is proposed to suppress the noise interference of the moving magnetic field,and the magnetostatic inverse solution algorithm is used to retrieve the size and orientation of the target.Finally,the detection experiment is performed with a round iron ball with a radius of 0.2 m and a surface cubic empty cavity with a side length of 5 m.The experimental results show that the superconducting magnetometer is stable and reliable and satisfies the requirements of underground exploration.
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