论文和技术资料

Remote field eddy current (RFEC) technique is a method of detecting defects in ferromagnetic tubes. This is based on low frequency eddy current, which employs an exciter coil and a receiver coil separated by a characteristic distance. The exciter is fed with a low frequency sinusoidal current and the receiver coil senses the perturbation of the magnetic fields caused by the eddy currents in the tube. The amplitude and phase of the induced voltage in the receiver coil is correlated to the presence of defects or anomalies in the tube wall. The RFEC phenomenon was solved at different excitation frequencies using COMSOL Multiphysics®. The predicted vector potential values were used to calculate the induced voltage in a fictitious receiver coil unit positioned at different axial locations.