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Nonlinear Wave Modulation and Time Reversal Tomography of Structural Defects
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SYSNO ASEP 0351999 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Nonlinear Wave Modulation and Time Reversal Tomography of Structural Defects Author(s) Převorovský, Zdeněk (UT-L) RID
Vejvodová, Šárka (UT-L)
Dos Santos, S. (FR)Number of authors 3 Source Title CFA 10. - Lyon : IntellAgence Technologies, 2010 - ISBN 978-2-9521105-7-0 Pages s. 1-4 Number of pages 4 s. Action 10éme Congrés Francais d´Acoustique Event date 12.04.2010-16.04.2010 VEvent location Lyon Country FR - France Event type WRD Language eng - English Country FR - France Keywords NDT ; acoustic emission ; ESAM ; DORT Subject RIV BI - Acoustics R&D Projects FR-TI1/274 GA MPO - Ministry of Industry and Trade (MPO) GA106/07/1393 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20760514 - UT-L (2005-2011) Annotation Classical ultrasonic tomography generally uses source signals of constant amplitude. Mostly linear characteristics like ultrasonic amplitude, attenuation or time of flight are used to structural defects imaging. On the other hand, more complex and nonlinear characteristics of elastic wave propagation provide more sensitive indicators of body changes and irregularities. Nonlinear Elastic Wave Spectroscopy (NEWS) techniques give us better information about damage with higher sensitivity and also the ability to detect defects smaller than the ultrasonic wavelength. Two NEWS methods are considered: Nonlinear Wave Modulation Spectroscopy (NWMS) and Nonlinear Time Reversal Mirrors (NLTRM) with ESAM and DORT signal processing. Testing results, obtained on metallic and concrete parts illustrate performance of both procedures. 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 2011
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