期刊
JOURNAL OF NONDESTRUCTIVE EVALUATION
卷 20, 期 2, 页码 73-86出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1023/A:1012244208475
关键词
pulsed eddy current; nondestructive inspection; time-frequency analysis; lap joint corrosion
Detection and measurement of the material loss due to corrosion in aircraft fuselage lap splices are of great importance to life management of ageing aircraft. Pulsed eddy current (PEC) techniques have shown the potential to fully characterise these structures. However, variations in the probe lift-off, the interlayer gaps and material thinning produce similar PEC signals, making signal interpretation very difficult. This paper describes time-frequency analysis algorithms applied to pulsed-eddy current signals from lap-joint specimens containing simulated flaws. The effect of probe lift-off, interlayer gap, and material thinning on PEC signals is examined in three-dimensional space (amplitude-time-frequency). This study shows that the time-frequency analysis of PEC signals provides specific visual patterns that can be related to the interlayer gap, lift-off, and material loss.
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