Time-reversed Lamb waves

Lamb waves are extensively involved in plate structure inspection because of their guided nature. However, their dispersive nature often limits their use in flaw detection. In this paper we show that the use of a time-reversal mirror (TRM) allows to automatically compensate for the dispersive nature...

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Veröffentlicht in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 1998-07, Vol.45 (4), p.1032-1043
Hauptverfasser: Ing, R.K., Fink, M.
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Fink, M.
description Lamb waves are extensively involved in plate structure inspection because of their guided nature. However, their dispersive nature often limits their use in flaw detection. In this paper we show that the use of a time-reversal mirror (TRM) allows to automatically compensate for the dispersive nature of Lamb waves. Experiments showing the spatial and temporal behavior of time-reversed Lamb waves, demonstrate the ability of TRMs to self-focus and to recompress dispersive pulses. This is demonstrated in a set of experiments in which a broadband ultrasonic laser source is used to simulate a point Lamb wave source and an optical interferometer is used to map the time reversed elastic field. We also show that TRM may work in pulse echo mode and allows to detect and to focus along large 2-D plates on any flaws located in the inspected area.
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ispartof IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 1998-07, Vol.45 (4), p.1032-1043
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1525-8955
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source IEEE Electronic Library (IEL)
subjects Acoustical measurements and instrumentation
Acoustics
Analysing. Testing. Standards
Applied sciences
Cross-disciplinary physics: materials science
rheology
Dispersion
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Inspection
Laser modes
Materials science
Materials testing
Metals. Metallurgy
Mirrors
Nondestructive testing
Nondestructive testing: ultrasonic testing, photoacoustic testing
Optical interferometry
Optical pulses
Physics
Testing for defects
Transmission line measurements
title Time-reversed Lamb waves
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