Magnetic Anomaly Detection in Ferromagnetic Material
This paper discusses a non-destructive testing(NDT)technique based on the magnetic flux leakage(MFL)method,which is able to detect magnetic anomalies in ferromagnetic material.The goal is the detection of very small inhomogeneities not only on the surface but also anywhere in the cross section of magneto-conductive objects by scanning their surfaces using low-cost GMR(giant magneto resistance)sensors at rather high scanning speeds(up to 1 m/s)in order to enable an automatic inspection and to minimize test time.The measured magnetic flux density variations due to the expected inhomogeneities are down to only some nT(depending on the inhomogeneity size and position)on a pedestal of some mT,therefore the system must realize a very high resolution and all parameters affecting the systems sensitivity(geometrical arrangement,sensors and electronics,signal acquisition,signal processing,etc.)have to be optimized in order to get a robust and highly sensitive measuring system.As a pilot survey,some test specimen were prepared(by inserting artificial inhomogeneities into otherwise homogeneous,isotropic magneto conductive objects)and inspected with a prototype measuring system.
J.Atzlesberger B.G.Zagar
Institute for Measurement Technology,Johannes Kepler University,Austria
国际会议
Progress in Electromagnetics Research Symposium 2011(2011年电磁学研究新进展学术研讨会)
苏州
英文
130-134
2011-09-01（万方平台首次上网日期，不代表论文的发表时间）