Method, Apparatus, System and Sensor For Detecting Multi-Mode Electromagnetic Acoustic and Magnetic Flux Leakage

A multi-mode electromagnetic acoustic and magnetic flux leakage detection sensor, comprising:

• a U-shaped magnetic yoke, configured to magnetize a material of an object to be detected, and generating a magnetic field signal in the object to be detected;
• a magnetic flux leakage receiving component, positioned in the middle of the U-shaped magnetic yoke, and used for detecting whether a leakage magnetic field signal exists outside the object to be detected or not;
• a first electromagnetic acoustic coil, positioned below a pole N of the U-shaped magnetic yoke, combined and used with a lower end of the pole N of the U-shaped magnetic yoke, and used for generating or receiving any one or more of multiple detection waves as follows:
• an ultrasonic bulk wave, an ultrasonic guided wave and a surface wave;
• a second electromagnetic acoustic coil, positioned below a pole S of the U-shaped magnetic yoke, combined and used with a lower end of the pole S of the U-shaped magnetic yoke, and used for generating or receiving any one or more of multiple detection waves as follows:
• an ultrasonic bulk wave, an ultrasonic guided wave and a surface wave.