Time reversal enabled elastic wave data communications using sensor arrays

2013 ◽  
Vol 134 (5) ◽  
pp. 3980-3980 ◽  
Author(s):  
Yuanwei Jin ◽  
Yujie Ying ◽  
Deshuang Zhao
Keyword(s):  
Elastic Wave ◽  
Time Reversal ◽  
Sensor Arrays ◽  
Data Communications ◽  
Wave Data

scholarly journals Evaluation of Delamination in Concrete by IE Testing Using Multi-Channel Elastic Wave Data

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 201 ◽  
Author(s):  
Seong-Hoon Kee ◽  
Jin-Wook Lee ◽  
Ma. Doreen Candelaria
Keyword(s):  
Data Processing ◽  
Elastic Wave ◽  
Single Channel ◽  
Experimental Studies ◽  
Test Method ◽  
Wave Data ◽  
Wave Measurements ◽  
Propagating Waves ◽  
The Impact ◽  
Wave Modes

The main objectives of this study are to develop a non-destructive test method for evaluating delamination defects in concrete by the Impact-echo test using multi-channel elastic wave data and to verify the validity of the proposed method by experimental studies in the laboratory. First, prototype equipment using an eight-channel linear sensor array was developed to perform elastic wave measurements on the surface of the concrete. In this study, three concrete slab specimens (1500 mm (width) by 1500 mm (length) by 300 mm (thickness)), with simulated delamination defects of various lateral dimensions and depth, were designed and constructed in the laboratory. Multi-channel elastic wave signals measured on the three concrete specimens were converted to the frequency-phase velocity image by using the phase-shift method. A data processing method was proposed to extract the dominant propagating waves and non-propagating waves from the dispersion images. The dominant wave modes were used to evaluate delamination defects in concrete. It was demonstrated that the surface wave velocity values were useful for characterizing the shallow delamination defects in concrete. In addition, the peak frequency of non-propagating wave modes extracted from the dispersion images gives information on the lateral dimensions and depths of the delamination defects. This study also discussed the feasibility of combined use of the results from propagating and non-propagating wave modes to better understand the information on delamination defects in concrete. As will be discussed, the multi-channel elastic wave measurements enable more accurate, consistent, and rapid measurements and data processing for evaluation of delamination defects in concrete than the single-channel sensing method.

A two-dimensional pseudospectral model for time reversal and nonlinear elastic wave spectroscopy

2007 ◽  
Vol 122 (6) ◽  
pp. 3220-3229 ◽  
Author(s):  
Thomas Goursolle ◽  
Samuel Callé ◽  
Serge Dos Santos ◽  
Olivier Bou Matar
Keyword(s):  
Elastic Wave ◽  
Time Reversal ◽  
Two Dimensional ◽  
Nonlinear Elastic ◽  
Nonlinear Elastic Wave

scholarly journals Theoretical Study of Memristor and \\ Time Reversal based\\ Nonlinear Elastic Wave Spectroscopy

2018 ◽  
Author(s):  
Sadataka Furui ◽  
Serge Dos Santos
Keyword(s):  
Elastic Wave ◽  
Time Reversal ◽  
Theoretical Study ◽  
Chaotic Oscillation ◽  
Acoustic Tomography ◽  
Linear Elastic ◽  
Strong Signal ◽  
Nonlinear Elastic ◽  
Nonlinear Elastic Wave ◽  
Elastic Unit

Principle of memristor presented by Leon Chua and time reversal based non-linear elastic wave spectroscopy (TR-NEWS) which can be applied to acoustic tomography are reviewed. Correlation of acoustic or electromagnetic nonlinear waves and its time reversed wave can produce strong signal. Materials like transducer or biological skin can be assumed to be composed of a large number of small elastic unit: hysteretic elementary unit (HEU), and one can take a HEU as a memristor whose operation depends on time. Relation between TR-NEWS and solitonic wave in fluid, and relation between decomposition of time reversal operator (DORT) and chaotic oscillation are discussed.

scholarly journals Inversion of pack ice elastic wave data to obtain ice physical properties

1998 ◽  
Vol 103 (C10) ◽  
pp. 21783-21793 ◽  
Author(s):  
Peter J. Stein ◽  
Steven E. Euerle ◽  
James C. Parinella
Keyword(s):  
Elastic Wave ◽  
Physical Properties ◽  
Wave Data ◽  
Pack Ice

Time reversal and non-linear elastic wave spectroscopy (TR NEWS) techniques

2008 ◽  
Vol 43 (3) ◽  
pp. 209-216 ◽  
Author(s):  
T.J. Ulrich ◽  
A.M. Sutin ◽  
R.A. Guyer ◽  
P.A. Johnson
Keyword(s):  
Elastic Wave ◽  
Time Reversal ◽  
Linear Elastic ◽  
Non Linear

scholarly journals Transient elasticity imaging and time reversal

2011 ◽  
Vol 141 (6) ◽  
pp. 1121-1140 ◽  
Author(s):  
Habib Ammari ◽  
Lili Guadarrama Bustos ◽  
Hyeonbae Kang ◽  
Hyundae Lee
Keyword(s):  
Elastic Wave ◽  
Time Reversal ◽  
Stokes System ◽  
Quantitative Estimation ◽  
Field Measurements ◽  
Geometrical Parameters ◽  
Far Field ◽  
Layer Potential ◽  
Incompressible Elasticity ◽  
Wave Induced

We consider a purely quasi-incompressible elasticity model. We rigorously establish asymptotic expansions of near- and far-field measurements of the transient elastic wave induced by a small elastic anomaly. Our proof uses layer potential techniques for the modified Stokes system. Based on these formulae, we design asymptotic imaging methods leading to a quantitative estimation of elastic and geometrical parameters of the anomaly.

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