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Ultrasonic Lamb wave tomography
Inverse Problems, 2002The ultrasonic Lamb wave tomography is considered in the frame of the pressing nondestructive evaluation (NDE) technology need. The work focuses on tomographic reconstruction to produce quantitative maps that can be easily interpreted by technicians or fed directly into structural integrity and lifetime prediction codes.
Leonard, Kevin R. +2 more
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Efficient laser generation of Lamb waves
Optics Letters, 2014We report about the efficient generation of Lamb waves for nondestructive testing (NDT) of carbon fiber reinforced plastics (CFRP) with spatially formed laser beams. Therefore we describe the successful introduction of a liquid crystal on silicon (LCoS)-based spatial light modulator (SLM) to create predetermined spatial laser light distributions for a ...
Philipp, Huke +4 more
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Time-frequency representations of Lamb waves
The Journal of the Acoustical Society of America, 2001The objective of this study is to establish the effectiveness of four different time-frequency representations (TFRs)—the reassigned spectrogram, the reassigned scalogram, the smoothed Wigner–Ville distribution, and the Hilbert spectrum—by comparing their ability to resolve the dispersion relationships for Lamb waves generated and detected with optical
M, Niethammer +3 more
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Localization of notches with Lamb waves
The Journal of the Acoustical Society of America, 2003A time–frequency representation (TFR) is used to analyze the interaction of a multimode and dispersive Lamb wave with a notch, and then serves as the basis for a correlation technique to locate the notch. The experimental procedure uses a laser source and a dual-probe laser interferometer to generate and detect Lamb waves in a notched plate.
Rüdiger, Benz +3 more
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Wideband dispersion reversal of lamb waves
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2014Ultrasonic guided waves have been widely acknowledged as the most promising tools for nondestructive evaluation (NDE). However, because of the multimodal dispersion, the received guided modes usually overlap in both time and frequency, which highly complicates the mode separation and signal interpretation.
Kailiang, Xu +4 more
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Material interface inspection by lamb waves
International Journal of Solids and Structures, 1997zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kundu, T., Maslov, K.
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Lamb wave interaction with light
Journal of Applied Physics, 1985The interaction of light with Lamb waves propagating in transparent plates has been investigated. The analytical study has been done by considering a three-step interaction, at the limiting surfaces and within the propagation medium. Experimental data are given, relative to isotropic crystal plates in the MHz frequency regions and compared with theory.
A. Alippi +3 more
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Damage Identification Using Lamb Waves
Key Engineering Materials, 2010The concept of damage detection using sensors in composite panels is of growing interest, due to the reduction in maintenance activity and increasing of the aircraft safety. Piezoelectric materials have been widely used to build a variety of transducers for activating and receiving Lamb waves which are used for delamination/damage detection. The aim of
Z. Sharif-Khodaei, Ferri M.H.Aliabadi
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Lamb-wave electroacoustic voltage sensor
Journal of Applied Physics, 1985The effect of a bias electric field on the phase velocity of Lamb waves propagating in a piezoelectric plate has been investigated in order to develop an electroacoustic voltage sensor. Experiments were performed on YX and YZ LiNbO3 Lamb-wave delay lines, used as the stabilizing element in the feedback loop of an oscillator, by measuring the fractional
Palma A, Palmieri L, Socino G, Verona E
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Contact scanning Lamb wave tomography
The Journal of the Acoustical Society of America, 1998Lamb waves are guided ultrasonic waves capable of propagating relatively long distances in platelike structures such as airframe skins, storage tanks, and pressure vessels. Their propagation depends on frequency thickness and material properties, and, because structural flaws present changes in effective thickness and/or material properties, Lamb waves
Mark Hinders +2 more
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