Signal processing at eddy current defectoscopy of composites using artificial neural networks

1Antoniuk, IN, 1Antoniuk, OP
1Oles Honchar Dnipro National University, Dnipro, Ukraine
Kosm. nauka tehnol. 2002, 8 ;(Supplement1):101-105
Publication Language: Russian
Carbon containing composite materials are widely implemented in different constructions of airspace technique due to their unique physico-mechanical properties. Last few years there has been intensive development and implementation of artificial neural networks for processing of signals, recognition and correction of images. This paper is dedicated to the creation of the neural network and to the elaboration of the algorithms of network's teaching for recognition of signals from defects and drawbacks that appear during eddy current testing of carbon fiber composites. Composite materials on the basis of carbon tissue have considerable roughness of the surface. That is why while scanning the surface of the material with an eddy current transformer, which has field centered in small volume, there often occur casual inclinations of the transformer. This makes false impulses which are comparable in amplitude and width with modulation impulses of the defect and they are frequently even bigger than impulses of surface cracks. Changes of the gap between the eddy current transformer and a surface of a testing material, casual inclinations of the transformer during scanning forms drawback impulses. These are the most essential preventing factors. The obtained results let to make correction of these factors and considerably improve reliance of defectoscopy.

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