The Effects of Lift-Off from Wall Thinning Signal in Pulsed Eddy Current Testing

Development of Pulsed Eddy Current Testing System for Wall Thinning through Insulation with Ferromagnetic Cladding

Corrosion is one of the important factors in equipment failures. Wall thinning can be used to evaluate corrosion conditions. However, most of equipments are coated with insulations in order to elevate the energy efficiency. Pulsed eddy current (PEC) testing technique can be used to measure wall thinning through insulation. But when the insulation outside is wrapped with galvanized steel, PEC si...

Lift-off effect in high-frequency eddy current conductivity spectroscopy

Precision eddy current measurements have been shown to be capable of characterizing the near-surface residual stress and cold work profiles in surface-treated components. To capture the peak compressive residual stress in moderately shot-peened (Almen 4–8A) nickel-base superalloys, the eddy current inspection frequency has to be as high as 50–80MHz. Unfortunately, spurious selfand straycapacita...

Differential Hall-sensor Pulsed Eddy Current Probe for the Detection of Wall thinning in an Insulated Stainless Steel Pipe

Wavelet based signal analysis of pulsed eddy current signals

This paper deals with response signals processing in eddy current non-destructive testing. Non-sinusoidal excitation is utilized to drive eddy currents in a conductive specimen. The response signals due to a notch with variable depth are calculated by numerical means. The signals are processed in order to evaluate the depth of the notch. Wavelet transformation is used for this purpose. Obtained...

Pulsed Eddy Current Non-destructive Testing and Evaluation: A Review

Pulsed eddy current (PEC) non-destructive testing and evaluation (NDT&E) has been around for some time and it is still attracting extensive attention from researchers around the globe, which can be witnessed through the reports reviewed in this paper. Thanks to its richness of spectral components, various applications of this technique have been proposed and reported in the literature covering ...