Modern multifrequency eddy current inspections typically produce more information than is actually processed by the analyst. The traditional “strip chart” and impedance-plane signal analysis presentations contain the data needed to simultaneously extract a number of quantities, including the depth profile and surface extent of flaws, the distance from the probe to the test piece, the character ...

The production of carbon fiber reinforced polymers, which are widely used both in civil and military applications, is an elaborate process un-free from faults and problems. Problems during the manufacturing, such as plies’ overlapping, can cause flaws in the resulting material, this way compromising its integrity. Compared with metallic materials, carbon epoxy composites show a number of advant...

A new method for analyzing eddy current inspection data is presented. The key concept behind this method is extraction and isolation of the sample response from the measured signal. The measured signal depends on many factors including, not only the characteristics of the probe itself, the sample material, the operation frequency, and the probe/sample geometry, but also the measurement instrume...

This paper reports a noncontact inspection method, using Pulsed Eddy Current (PEC) stimulated thermography, for the evaluation of the anisotropic dependency of electrical conductivity of steel exposed to tensile stress. This method combines microscope lens based thermography with PEC using a rectangular excitation coil, giving directional excitation, to infer the electromagnetic properties vari...

Electric impedance imaging is a method of reconstructing spatial distribution of electrical conductivity inside a subject. In this paper, a new method of electrical impedance imaging using eddy current is proposed. The eddy current distribution in the body depends on the conductivity distribution and the magnetic field pattern. By changing the position of magnetic core, a set of voltage differe...