Hand-held magnetic flux leakage scanning device based on giant magnetoresistance array sensor

• Main Authors: ZHU BIN, ZHANG RUIMENG, SHEN CHANGYU, ZHU ZHOUHONG, ZHOU JUN, YUAN FEIYI, TIAN RUOTONG, YANG JIAO, LI SHENGRU, LI XIANG, WANG ZHAOKUN
• Format: Patent
• Language: Chinese; English
• Published: 29.08.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a handheld magnetic flux leakage scanning device based on a giant magnetoresistance array sensor. The device is composed of an electronic signal processing module, neodymium-iron-boron magnets, a giant magnetoresistance array, a signal transmission line, a shell, a handle and a flexible circuit film, the neodymium-iron-boron magnets with opposite magnetism are fixed to the center and the periphery of the detection device respectively, and a closed-loop static magnetic field is formed in the space; the cracks in the material enable magnetic lines to overflow and penetrate through the giant magnetoresistance at a certain angle and generate magnetic signals at the same time, at the moment, the adjacent giant magnetoresistance above the defect area generates huge differential mode signals, the signals are transmitted to the electronic signal processing module to be analyzed, and therefore the depth and position of the cracks are judged. According to the handheld magnetic flux leakage scann