External magnetization system using multiple solenoid modules with halbach array and operation method therefor

An external magnetization system using multiple solenoid modules with a Halbach array, the external magnetization system comprising:

• a support frame;
• a magnetization device including multiple solenoid modules arranged in a predetermined direction by a Halbach array along the support frame, and generating a plurality of magnetic lines in a predetermined direction for cross-sectional magnetization of a prestressed (PS) steel in a prestressed concrete (PC) member;
• a detection device measuring changes in a magnetic flux density associated with the plurality of magnetic lines;
• and
• A control device controlling the magnetization device in conjunction with the detection device,
• wherein the multiple solenoid modules include:
• a first solenoid module having N and S poles arranged in a predetermined direction;
• a second solenoid module arranged at one end associated with the N pole of the first solenoid module;
• and
• a third solenoid module arranged at the other end associated with the S pole of the first solenoid module.