Enhanced Feature Extraction Algorithms Using Oscillatory-Mode Pulsed Eddy Current Techniques for Aircraft Structure Inspection

Abstract A review of the existing literature shows that modern pulsed eddy current (PEC) technique for flaw detection in aircraft structure inspection is typically carried out aperiodic mode. ?t same time, unstable characteristic points EC signal usually used as informative parameters can restrict potential this excitation mode due to significant measurement errors. This article considers an advanced PEC method NDT based on oscillatory To obtain conditions concerned with different modes probe response oscillations, equivalent scheme “testing object – probe” system was developed and analyzed. The frequency attenuation coefficient natural oscillations are proposed signals. obtained mathematical model signals allows dependence characteristics testing be evaluated. Herein, we first develop algorithmic software determining analyzing discrete amplitude phase simulation results. errors determination well optimal time its analyzed order minimize possible Next, experimentally investigated using a set specimens. results confirm possibility methodology enhance procedures related electrical conductivity geometric measurements detected defect sizing.