Počet záznamů: 1

Non-linear time reversal ultrasonic pseudo-tomography

  1. 1.
    0363969 - UT-L 2012 RIV CH eng J - Článek v odborném periodiku
    Převorovský, Zdeněk - Vejvodová, Šárka - Krofta, Josef - Převorovský, David
    Non-linear time reversal ultrasonic pseudo-tomography.
    International Journal of Microstructure and Materials Properties. Roč. 6, 3/4 (2011), s. 206-213 ISSN 1741-8410.
    [NDT in Progress. Praha, 05.11.2007-07.11.2007]
    Grant CEP: GA MPO(CZ) FR-TI1/274
    Výzkumný záměr: CEZ:AV0Z20760514
    Klíčová slova: NDT * nonlinear elastic wave spectroscopy * time reversal mirrors * ultrasonic pseudo-tomography
    Kód oboru RIV: BI - Akustika a kmity
    http://www.inderscience.com/offer.php?id=43216

    Nonlinear Elastic Wave Spectroscopy (NEWS) became an effective methodology for NDT of complex structures, providing high sensitivity of damage detection. One of the most promising NEWS procedures is based on Nonlinear Time Reversal Mirrors (NLTRM). General NLTRM procedure is mostly global, which brings difficulties with defect localization. In this paper, a procedure modification is proposed, based on similar arrangement as ultrasonic tomography. Array of transducers is spaced on a structure with defect. Individual piezoelectric transducers subsequently transmit direct signals, which are detected by receivers, then time-reversed and sent back. High-voltage relay multiplexer is used to switch between transmitters and receivers. Matrices of back-received signals and their spectra are analyzed, and their nonlinear features are extracted along all wave-paths. Procedure application is illustrated by NDT of aircraft parts where NLTRM pseudo-tomography is used to allocate defective zones.
    Trvalý link: http://hdl.handle.net/11104/0199576