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Material State Awareness for Composites Part I: Precursor Damage Analysis Using Ultrasonic Guided Coda Wave Interferometry (CWI) [PDF]
Materials, 2017 Sourav Banerjee +2 more
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Elastic rays and coda wave interferometry.
The Journal of the Acoustical Society of America, 2010We apply the concept of rays, well known from geometric optics, to elastic waves traveling in a finite solid. Ray splitting and mode conversion between compressional P-waves and transversal S-waves are taken into account by using a random walk procedure and Monte-Carlo integration.
Thomas Gorin, Adrian Ortega
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MONITORING EARLY CEMENT HYDRATION WITH CODA WAVE INTERFEROMETRY
Proceedings of the 13th International Workshop on Structural Health Monitoring, 2022The inorganic chemical reaction of hydraulic binders, such as cement with water, is a complex mechanism and a vital part of every building process involving concrete. Dur ing this hydration reaction, the system develops strength due to the formation of various solid hydration phases over time.
FABIAN DIEWALD +4 more
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A review of ultrasonic Coda Wave Interferometry in concrete
Cement and Concrete Research, 2013Abstract Concrete is a multicomposite material with heterogeneities ranging in size from micrometers to centimeters. At low frequency (below 50 kHz), ultrasound propagates through concrete without suffering scattering and absorption. On the contrary, above ≈ 100 kHz, the waves strongly interact with all the heterogeneities and enter a multiple ...
T. Planès, E. Larose
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Monitoring stress changes in a concrete bridge with coda wave interferometry
The Journal of the Acoustical Society of America, 2011Coda wave interferometry is a recent analysis method now widely used in seismology. It uses the increased sensitivity of multiply scattered elastic waves with long travel-times for monitoring weak changes in a medium. While its application for structural monitoring has been shown to work under laboratory conditions, the usability on a real structure ...
Stähler, S. +2 more
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Sensitivity of coda wave interferometry to fluid migration through rock
The Journal of the Acoustical Society of America, 2019The sound speed of a porous medium changes with fluid substitution when the fluids have different acoustic properties. The authors demonstrate that coda wave interferometry is capable of sensing subtle local sound speed changes associated with minute fluid displacements, Δh.
Kenneth W, Desmond, John J, Valenza
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Coda Wave Interferometry for Estimating Nonlinear Behavior in Seismic Velocity
Science, 2002In coda wave interferometry, one records multiply scattered waves at a limited number of receivers to infer changes in the medium over time. With this technique, we have determined the nonlinear dependence of the seismic velocity in granite on temperature and the associated acoustic emissions.
Roel, Snieder +3 more
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The Theory of Coda Wave Interferometry
pure and applied geophysics, 2006Coda waves are sensitive to changes in the subsurface because the strong scattering that generates these waves causes them to repeatedly sample a limited region of space. Coda wave interferometry is a technique that exploits this sensitivity to estimate slight changes in the medium from a comparison of the coda waves before and after the perturbation ...
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Coda wave interferometry and the equilibration of energy in elastic media
Physical Review E, 2002Multiple-scattered waves usually are not useful for creating deterministic images of the interior of elastic media. However, in many applications, one is not so much interested in making a deterministic image as in detecting changes in the medium. Cases in point are volcano monitoring and measuring the change in hydrocarbon reservoirs during enhanced ...
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Detection of Velocity Perturbation Based on Coda Wave Interferometry
Proceedings, 2014Comparing with head wave, coda wave propagates through a long path with multiple scattering and consequently can magnify reservoir velocity perturbations. Thus it is possible to detect slight wave velocity change caused by reservoir physical parameter variations with coda wave interferometry technique.
J. Li +5 more
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