The detector with magnet produces a longitudinal magnetic field on the circumference of the tube wall. When the detector is in the tube, if the tube wall without defect, the magnetic coil is inside the tube wall. If the inner wall or the outer wall of the tube is defective, the magnetic force lines will penetrate out of the tube wall to produce magnetic leakage(Magnetic Flux Leakage-MFL). The operation of the process as shown below. The leakage magnetic field is located between the two poles, close to the probe of the tube wall to pick up, and produce the corresponding induction signal, the signal through the filter, after amplified processing, recorded on the detector with the memory, and then Playback processing data, to determine its identification.
Product structure
