Secondary Peak Separation of Remote Field Eddy Current Testing in Ferromagnetic Pipes

Abstract

Since the magnetic field signal will penetrate the pipe’s wall twice in Remote Field Eddy Current(RFEC) Testing, the receiver’s signal arises two peaks when the pipe exists defects, which are called first peak and second peak separately. And the second peak is a disturbance for the location of defects, it will cause incorrect results in pipe evaluation. For the sake of eliminating the disturbance in RFEC testing, a method based on Radial Basis(RB) function and Nelder-Mead Simplex Method(NMSM) was introduced and part of RB functions were chosen for removing second peak. Simulation results demonstrate that the proposed method can eliminate the disturbance efficiently based on one receiver.