Characterization of Defects on Ferromagnetic Tubes Using Magnetic Flux Leakage

Detection of the defects and estimation of the defect's parameters on the inspected specimen are complicated tasks in process industries. In this paper, a radial component of the magnetic flux leakage (MFL) is employed to detect and estimate the parameters of a circular defect on the outer surface of a ferromagnetic tube. The magnetizer arrangement with a Hall sensor is used to acquire the radial component of MFL, defects are estimated. The proposed estimation procedure is verified by preparing analytical, numerical, and experimental studies. The volumetric analyses were performed on three study cases. A good correlation is observed among the three studies. Estimation of the defect parameter in the proposed method yields good efficiency.