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Lift-off effect reduction in motion-induced eddy current testing based on a novel signal feature
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DOI：10.1080/10589759.2026.2680279.png)
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Abstract
En 中文
Lift-off is regarded as one of the major issues in eddy current testing. Lift-off variations not only lead to a reduction in sensor sensitivity but also an inaccuracy in defect identification. In motion-induced eddy current (MIEC) testing, the high inspection speed causes intensified probe vibration and surface fluctuations of the specimen, which significantly exacerbate the lift-off effects. To solve this issue, this paper proposes an improved analytical solution for coils of more complex configurations. Furthermore, sensitivity analysis is employed, for the first time, to analyse perturbation signals in MIEC testing, leading to the proposal of a novel signal feature to reduce lift-off effects, peak-to-peak ratio. This new signal feature is compared with the conventional peak-to-peak amplitude both numerically and experimentally. The results show that the peak-to-peak ratio can not only detect defect depth but also effectively suppress lift-off effects. Experimental results demonstrate that the peak-to-peak ratio exhibits a 91.8% reduction in the coefficient of variation to lift-off compared with the peak-to-peak amplitude, indicating a significant improvement of signal stability against lift-off.
Keywords:
Lift-off effect
sensitivity analysis
analytical model
motion-induced eddy current
non-destructive testing
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