A multi-frequency eddy current inversion method for characterizing conductivity gradients on water jet peened components

Inspection and Structural Health Monitoring techniques for Concentrated Solar Power plants

“…Similarly, PEC can be used to evaluate insulated pipelines in CSP plants although the resolution of the inspection will be generally very low [49,50]. If the insulation is removed PEC and Multi-Frequency Eddy Current (MFEC) testing [51] can be used to reveal cracks, pitting, corrosion and erosion in the pipes. Alternatively EC probes can be mounted on pigs and inspect the pipe from the inside.…”

Iterative inversion method for eddy current profiling of near-surface residual stress in surface-treated metals

“…In analytical studies, the first step is usually based on some variation of the analytical model originally developed by Dodd and Deeds for a homogenous half-space covered with a single conductive layer [17], which was later extended to arbitrary number of layers using the transfer matrix method [18]. Based on this approach, several different numerical and, for certain profiles, also analytical solutions are available in the literature [19][20][21][22][23][24][25][26].…”

“…[27][28][29]. In spite the easier physical interpretation of the frequency-dependent AECC spectrum versus the more convoluted electric coil impedance, essentially all the available studies in the literature are based on the impedance method [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Eddy Current Transducer with Rotating Permanent Magnets to Test Planar Conducting Plates

“…Several types of ECT techniques have been developed so far; for example, the pulsed eddy current technique, where an eddy current probe is excited with a rectangular stimulus [9], or the single or multiple frequency technique, where the probe is excited with one or a series of sinusoidal signals [10,11]. Another approach is the Lorentz force eddy current technique (LET) [12,13,14,15].…”