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Non-linear ultrasonic time-reversal mirrors in NDT
- 1.0388400 - ÚT 2013 IT eng A - Abstract
Převorovský, Zdeněk
Non-linear ultrasonic time-reversal mirrors in NDT.
Lectio Materia. -, č. 4 (2012), s. 4-4
[World Conference on Nondestructive Testing /18./. 16.4.2012-20.4.2012, Durban]
R&D Projects: GA MPO(CZ) FR-TI1/274; GA MPO(CZ) FR-T1/198; GA ČR(CZ) GAP104/10/1430
Institutional research plan: CEZ:AV0Z2076919
Keywords : non-linear ime reversal mirror * ultrasonic techniques * ESAM
Subject RIV: BI - Acoustics
http://www.academia-ndt.org/Downloads/AcademiaNews4.pdf
Various NDT techniques based on non-linear time-reversal mirrors (NL TRM) were developed during the last few years and have already been utilised in practice. Different modifications involve, for example, pulse inversion, frequency intermodulation, harmonic filtration, time shifting, decomposition of time reversal (TR) operator (DORT), excitation with symmetry analysis (ESAM) or chirp coding. Piezoelectric transducers are mostly used as both wave transmitters and receivers, and multiplexers switch between modes. Also, the non-contact receiving is realised using laser interferometers or air-coupled transducers. In that case, the reciprocity principle is applied – an array of transmitters is used as a source of both forward and TR waves. Ultrasonic NL TRM techniques are today under intensive development and are becoming very promising in the NDT and structural health monitoring fields.
Permanent Link: http://hdl.handle.net/11104/0217439
Number of the records: 1