<title>Recent advances in remote field eddy current NDE techniques and their applications in detection, characterization, and monitoring of deeply hidden corrosion in aircraft structures</title>

Abstract

The remote field eddy current (RFEC) technique is based on the RFEC phenomenon which is characterized by differences in the energy flow patterns in the near and remote field regions. The energy released by the probe excitation coil traverses the pipe al twice before reaching the pickup coil. The RFEC technique, currently used in metallic tube inspection, is therefore characterized by its equal sensitivity to a flaw irrespective to its location in the tube wall. It can be used for detecting defects located several skin-depths away from the excitation source, since its inspection capacity is limited by the skin-depth of the specimen, but by the signal-to-noise ratio for a particular measurement condition.