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| Description
| - Nonlinear Time Reversal in systems having localized nonlinearities has been demonstrated in several complex media: acoustic waves through materials with defects[1], and recently for electromagnetic signals in systems containing a passive harmonic generating nonlinear element[2]. Recent ten years have seen considerable development (both in numerical and experimental aspects) of optimized signal processing methods for improving Non Destructive Testing (NDT) methods derived from Nonlinear Elastic Wave Spectroscopy (NEWS). Using symmetry invariance, nonlinear Time Reversal (TR) and reciprocity properties, the classical NEWS methods are supplemented and improved by new excitations having the intrinsic property of enlarging frequency analysis bandwidth and time domain scales[3]. This is the case of TR-NEWS, recognized as a useful tool for microcracks detection of various complex samples, but also for nonlinear scatterers localization. Associate TR-NEWS experiments have been validated by the large number of simulation results supporting procedure reliability. TR-NEWS signal processing is performed using symmetrisation of coded-excitation practically realized using pulse-inversion methods and their daughter extension. In this contribution, we concentrated on signal processing and statistical analysis of a NEWS based microdamage imaging technique, which is believed to be a good candidate for sensitive imaging of nonlinear scattering zones. We will present experimental results where, somewhat surprisingly, it is confirmed that, in the presence of boundary reflections, a high quality of the basic time reversal reconstruction still occurs, and reception of only a small fraction of the transmitted energy is sufficient for construction of the focusing wave.
- Nonlinear Time Reversal in systems having localized nonlinearities has been demonstrated in several complex media: acoustic waves through materials with defects[1], and recently for electromagnetic signals in systems containing a passive harmonic generating nonlinear element[2]. Recent ten years have seen considerable development (both in numerical and experimental aspects) of optimized signal processing methods for improving Non Destructive Testing (NDT) methods derived from Nonlinear Elastic Wave Spectroscopy (NEWS). Using symmetry invariance, nonlinear Time Reversal (TR) and reciprocity properties, the classical NEWS methods are supplemented and improved by new excitations having the intrinsic property of enlarging frequency analysis bandwidth and time domain scales[3]. This is the case of TR-NEWS, recognized as a useful tool for microcracks detection of various complex samples, but also for nonlinear scatterers localization. Associate TR-NEWS experiments have been validated by the large number of simulation results supporting procedure reliability. TR-NEWS signal processing is performed using symmetrisation of coded-excitation practically realized using pulse-inversion methods and their daughter extension. In this contribution, we concentrated on signal processing and statistical analysis of a NEWS based microdamage imaging technique, which is believed to be a good candidate for sensitive imaging of nonlinear scattering zones. We will present experimental results where, somewhat surprisingly, it is confirmed that, in the presence of boundary reflections, a high quality of the basic time reversal reconstruction still occurs, and reception of only a small fraction of the transmitted energy is sufficient for construction of the focusing wave. (en)
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| Title
| - Acoustic wave focusing in complex media using Nonlinear Time Reversal coded signal processing
- Acoustic wave focusing in complex media using Nonlinear Time Reversal coded signal processing (en)
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| skos:prefLabel
| - Acoustic wave focusing in complex media using Nonlinear Time Reversal coded signal processing
- Acoustic wave focusing in complex media using Nonlinear Time Reversal coded signal processing (en)
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| skos:notation
| - RIV/68407700:21340/14:00223093!RIV15-MSM-21340___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/68407700:21340/14:00223093
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - Ultrasonic Testing (UT); signal processing; ndt; TR-NEWS; nonlinear acoustics; Nonlinear Time Reversal (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - DE - Spolková republika Německo
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Kůs, Václav
- Dos Santos, S.
- Dvořáková, Zuzana
- Převorovský, Z.
- Lints, M.
- Salupere, A.
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| issn
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| number of pages
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| http://localhost/t...ganizacniJednotka
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