Title :
Leakage flux testing using a GMR line sensor and a rotating magnetic field
Author :
Kataoka, Yasuhiro ; Wakiwaka, Hiroyuki ; Shinoura, Osamu
Author_Institution :
Fac. of Eng., Shinshu Univ., Nagano, Japan
Abstract :
A new system configuration of magnetic leakage flux testing using a GMR line sensor and a rotating magnetic field is proposed. The GMR line sensor, which we developed, can visualize a magnetic field distribution by a single axis scan. Directional sensitivity and frequency characteristics of the multilayer GMR element are shown. Leakage flux is generated near a defect. Using a rotating magnetic field, the leakage flux can be generated independent of the direction of the defect. Using this system, leakage flux distribution near the defect is detected and it is shown that the shape of defect is identified.
Keywords :
flaw detection; giant magnetoresistance; magnetic fields; magnetic flux; magnetic leakage; magnetic sensors; sensitivity; GMR line sensor; NDT; defect detection system; directional magnetic sensitivity; frequency characteristics; magnetic field distribution; magnetic leakage flux testing; multilayer GMR element; nondestructive testing; rotating magnetic field; single axis scan; Frequency; Leak detection; Magnetic fields; Magnetic flux; Magnetic multilayers; Magnetic sensors; Sensor phenomena and characterization; Sensor systems; System testing; Visualization;
Conference_Titel :
Sensors, 2002. Proceedings of IEEE
Print_ISBN :
0-7803-7454-1
DOI :
10.1109/ICSENS.2002.1037209
