GMR Based Eddy Current System for Defect Detection
The Giant Magneto Resistance (GMR) sensor is successfully used in eddy current testing because of its good low frequency detection characteristics and high sensitivity.In order to obtain more information about defects, this paper designed a GMR based eddy current system with Field Programmable Gate Array (FPGA) for defect detection.The system can get both the amplitude of the GMR sensors output signal and the phase related to the exciting current at the same time.Through a series of detection experiments with defects of different widths of 6mm, 8mm and 10mm, it is found that both the amplitude and the phase can clearly reflect the magnetic field changes caused by various defects.By comparing the data curves, it is proved that the phase information matches better with the real size of the defects than the amplitude information.The conclusion is beneficial for further quantitative defect detection.
giant magneto resistance eddy current testing FPGA defect
Wang Chao Zhi Ya Gao Peng
Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engimeering and Automation,Tianjin University Weijin Road 92,Tianjin 300072,China
国际会议
哈尔滨
英文
1076-1080
2013-08-16（万方平台首次上网日期，不代表论文的发表时间）