A Finite Element Prediction of Possible Application of Pulse Excitation in Remote Field Eddy Current Nondestructive Inspection Devices *,*

Abstract

The remote field eddy current effect is relatively new in the nondestructive testing inspection technique. Low frequency A.C. excitation is commonly used in remote field eddy current nondestructive testing devices, and, phase lags of detected signals are used to measure the tube wall condition. A finite element/finite difference simulation of a half sinusoidal current pulse excitation response in such a device is used in this paper. The results show that a similar effect also occurs at remote field region of the pulse excited remote field eddy current device, time delays at some critical movements of the signal way form could be used to measure the relative wall conditions. Finally the signals in the time domain are also converted to expression in the frequency domain in order to get multifrequency responses, which could probably be helpful in further defect identification and classification.