Multi-frequency eddy current NDE of the distance between parts in aeronautical assemblies.
In proceedings of the The 15th International Workshop on Electromagnetic Nondestructive Evaluation, 13–16 June 2010
. This paper deals with the eddy currents non destructive evaluation of the thickness of the air layer that may separate metallic parts in some aeronautical assemblies. An experimental study of the coupling of a magnetic cup core coil sensor with a metallic layered structure is carried out and confirmed by finite elements modelling simulations. Based on this study, a method relying on a polynomial forward model of the coupling is proposed to estimate the air layer thickness. It appears that the method lacks accuracy and precision as the signal to noise ratio deteriorates. Besides, an estimation method based on an inverse model is proposed. This time, the obtained estimation results prove to remain accurate and precise as the signal to noise ratio deteriorates.
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