Nonlinear ultrasonic tomography using intermodulation techniques and time-reversal mirrors

0333801 - ÚT 2010 RIV CZ eng A - Abstrakt
Převorovský, Zdeněk - Vejvodová, Šárka - Krofta, Josef - Převorovský, David
Nonlinear ultrasonic tomography using intermodulation techniques and time-reversal mirrors.
NDT Welding Bulletin. Pavel Turek-Agentura Tiret. Roč. 19, č. 3 (2009), s. 19-19. ISSN 1213-3825.
[DEFEKTOSKOPIE 2009. 04.11.2009-06.11.2009, Praha]
Grant CEP: GA ČR GA106/07/1393; GA MPO(CZ) FR-TI1/274
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: nonlinear elastic wave spectroscopy * time reversal mirrors * nonlinear wave modulation * uktrasonic tomography
Kód oboru RIV: BI - Akustika a kmity
www.cndt.cz

Nonlinear parameters obtained by Nonlinear Elastic Wave Spectroscopy (NEWS) NDT techniques can give us better information about incipient damage zones than linear ones. Some limitations of NEWS methodology are given by difficulties with more precise defects location when global excitation of larger or more complicated structures is applied. To overcome these constraints, further developments of NEWS techniques referred as nonlinear pseudo-tomography or tomography defects imaging are described in the paper. Two NEWS methods are considered: Nonlinear Wave Modulation Spectroscopy (NWMS) and Nonlinear Time Reversal Mirrors (NLTRM) with ESAM and DORT processing. Both procedures use transducer arrays, allowing localization of damaged zones. Testing results, obtained on metallic and concrete parts illustrate performance of both procedures.
Trvalý link: http://hdl.handle.net/11104/0178706