Original title: Nonlinear elastic wave spectroscopy in symbiosis with time reversal for localization of defects: TR-NEWS
Authors: Dos Santos, S. ; Vejvodová, Šárka ; Převorovský, Zdeněk
Document type: Papers
Conference/Event: NDT in Progress /5./, Praha (CZ), 2009-10-12 / 2009-10-14
Year: 2009
Language: eng
Abstract: Using the symmetry invariance and reciprocity the classical NEWS methods are supplemented and improved by practically elaborated TR-NEWS procedure having the intrinsic property of enlarging frequency analysis bandwidth. Coded excitations have been generalized using Symmetry Analysis ESAM (Excitation Symmetry Analysis Method), including also the chirp-coded excitation, which improves the signal to noise ratio and enables harmonic imaging of complex specimen. In this paper, we propose a new NDT application of the above approaches implemented on a composite specimen with adhesive joints. The calibrated chirp-coded TR-NEWS imaging of the sample is obtained by using the symmetrical excitations, and pre- and post- signal processing. Localization of the scatterer is illustrated on 2D plot.
Keywords: ESAM; nonlinear elastic wave spectroscopy(NEWS); time reversal (TR); tomography; TR-NEWS imaging
Project no.: CEZ:AV0Z20760514 (CEP), GA106/07/1393 (CEP), FR-TI1/274 (CEP)
Funding provider: GA ČR, GA MPO
Host item entry: NDT in PROGRESS, ISBN 978-80-214-3968-9

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0179107

Permalink: http://www.nusl.cz/ntk/nusl-40916


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