In this study, the effect of lift-off distance variation in eddy-current measurement is compensated by estimating the zero-lift-off phase value based on the modified theoretical derivation of the phase value and lift-off distance measurement. The theoretical model shows that the phase value variation from zero to an arbitrary lift-off distance can be expressed as a simple exponential function. Based on this observation, the phase value at an arbitrary lift-off distance is normalized to the zero-lift-off phase value. Finally, the experimental validation is performed using 3D printed Ti-6Al-4V specimens with various electrical conductivities.
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Lim et al. (2023) studied this question.
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