Effects of Magnetic Concentrator on MFL Signals Using FEA
Magnetic flux leakage (MFL) is a non-destructive testing method used to inspect ferrous materials. However, there are a variety of factors that can affect the MFL inspection tool’s ability to detect and characterize anomalies. MFL signals obtained during the inspection of pipes have been simulated using 3D finite element analysis (FEA) and the effects of magnetic concentrator on MFL signals are investigated. Measurements of the leakage flux with various defect depths or widths indicate that the axial component of MFL are improved by magnetic concentrator with the result that significant advantages could be obtained in defect detection schemes, in that the signal to noise ratio (SNR) of MFL signals can be improved by magnetic concentrator.
Helen Zhang, Gang Shen and David Jin
Q. Song "Effects of Magnetic Concentrator on MFL Signals Using FEA", Advanced Materials Research, Vols. 204-210, pp. 1956-1959, 2011