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Combined ESAM and DORT method in nonlinear ultrasonic spectroscopy
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SYSNO ASEP 0334351 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Combined ESAM and DORT method in nonlinear ultrasonic spectroscopy Author(s) Vejvodová, Šárka (UT-L)
Převorovský, Zdeněk (UT-L) RID
Dos Santos, S. (FR)Source Title NDT in PROGRESS. - Brno : University of Technology Brno, 2009 / Mazal P. - ISBN 978-80-214-3968-9 Pages s. 311-320 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 ; DORT Subject RIV BI - Acoustics R&D Projects GA106/07/1393 GA ČR - Czech Science Foundation (CSF) GA101/07/1518 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20760514 - UT-L (2005-2011) Annotation Combination of ESAM (Excitation Symmetry Analysis Method) and DORT (Décomposition de l’Opérateur du Retournement Temporel) provides a powerful tool for detection and localization of defects by analysis of their nonlinear signature. Piezoelectric transducers are used for both excitation and data acquisition. Transmitters consequently emit the excitation signals and corresponding responses are measured by the array of receivers. The amplitude of excitation signals is variable as to separate the nonlinear parts of the measured signal. ESAM signal pre-processing is used for nonlinear parts extraction. Separated signal records form linear and nonlinear multistatic data matrices. DORT method is applied on data matrices to separate echoes of defects in the tested medium. Obtained data are used for evaluation of nonlinear parameters corresponding to separated defects and also for their localization. The procedure is completed by visualization of nonlinear signatures of detected defects. 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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