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Nonlinear elastic wave spectroscopy in symbiosis with time reversal for localization of defects: TR-NEWS
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SYSNO ASEP 0334347 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Nonlinear elastic wave spectroscopy in symbiosis with time reversal for localization of defects: TR-NEWS Author(s) Dos Santos, S. (FR)
Vejvodová, Šárka (UT-L)
Převorovský, Zdeněk (UT-L) RIDSource Title NDT in PROGRESS. - Brno : University of Technology Brno, 2009 / Mazal P. - ISBN 978-80-214-3968-9 Pages s. 27-36 Number of pages 10 s. Action NDT in Progress /5./ Event date 12.10.2009-14.10.2009 VEvent location Praha Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords nonlinear elastic wave spectroscopy(NEWS) ; ESAM ; time reversal (TR) ; TR-NEWS imaging ; tomography Subject RIV BI - Acoustics R&D Projects GA106/07/1393 GA ČR - Czech Science Foundation (CSF) FR-TI1/274 GA MPO - Ministry of Industry and Trade (MPO) CEZ AV0Z20760514 - UT-L (2005-2011) Annotation 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. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2010
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