Abstract
Sweep-frequency eddy current testing(ECT) is an efficient tool in nondestructive testing and evaluation due to its characteristics of non-contact, high sensitivity and abundant frequency information. In fact, the lift-off fluctuation is the main influencing factor to introduce the measurement errors. In this paper, the response signal feature, i.e. lift-off irrelevant frequency (LIF), has been found, which is immune to the effect of lift-off. Based on the characteristics, the sensor including two pairs of T-R coils is designed to obtain the feature point of LIF. Related analytical solutions and experiments are conducted to investigate the properties of LIF for non-magnetic materials, and the performance of LIF is also analyzed along with the conductivity and thickness of the tested piece. Hence, the LIF can provide the effective measurement of non-magnetic materials and immune to the lift-off fluctuation. The errors of thickness and conductivity measurement are 3.7% and 3.8% respectively.
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