Title: Ultrasonic NDT for flaws characterisation using ARTMAP network and wavelet analysis

Authors: M.C. Moisen, H. Benitez-Perez, Lucia Medina

Addresses: DISCA-IIMAS-UNAM, Universidad Autonoma de Guerrero, Acapulco, Mexico D.F., 4510 Mexico. ' Departamento de Ingenieria de Sistemas Computacionales y Automatizacion, Instituto de Investigaciones en Matematicas Aplicadas y Sistemas, Universidad Nacional Autonoma de Mexico, Mexico D.F., 4510 Mexico. ' Departamento de Fisica, Facultad de Ciencias, Universidad Nacional Autonoma de Mexico, Mexico D.F., 4510 Mexico

Abstract: Ultrasonic technique has been successfully used in a Non-Destructive Testing (NDT) of materials. This method aims to characterise the physical properties of reflectors in terms of their location, size, orientation, etc. To perform ultrasonic NDT, a transmitting/receiving transducer is moved along a known path producing a reflectivity map of the tested material. In order to characterise flaws, an innovative methodology of ARTMAP network and Wavelet Transform is presented. It consists of two non-supervised networks which are then used to build a mapfield. The mapfield is constructed using the neural networks output trained with time-scale information of perpendicular reflectivity maps.

Keywords: ultrasonic NDT; non-destructive testing; ARTMAP; flaw characterisation; ultrasonic testing; wavelet transform; neural networks; reflectivity maps; material flaws; materials testing.

DOI: 10.1504/IJMPT.2008.022517

International Journal of Materials and Product Technology, 2008 Vol.33 No.4, pp.387 - 403

Published online: 12 Jan 2009 *

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