Original title: Combined ESAM and DORT method in nonlinear ultrasonic spectroscopy
Authors: Vejvodová, Šárka ; Převorovský, Zdeněk ; Dos Santos, S.
Document type: Papers
Conference/Event: NDT in Progress /5./, Praha (CZ), 2009-10-12 / 2009-10-14
Year: 2009
Language: eng
Abstract: 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.
Keywords: DORT; ESAM; nonlinear elastic wave spectroscopy (NEWS); time reversal (TR); TR-NEWS imaging
Project no.: CEZ:AV0Z20760514 (CEP), GA106/07/1393 (CEP), GA101/07/1518 (CEP)
Funding provider: GA ČR, GA ČR
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/11104/0179111

Permalink: http://www.nusl.cz/ntk/nusl-40917


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