Coda wave interferometry for the measurement of thermally induced ultrasonic velocity variations in CFRP laminates

2016 ◽  
Author(s):  
Richard Livings ◽  
Vinay Dayal ◽  
Dan Barnard
Keyword(s):  
Ultrasonic Velocity ◽  
Coda Wave ◽  
Thermally Induced ◽  
Cfrp Laminates ◽  
Velocity Variations ◽  
Coda Wave Interferometry

Seasonal cycles of seismic velocity variations detected using coda wave interferometry at Fogo volcano, São Miguel, Azores, during 2003–2004

2009 ◽  
Vol 181 (3-4) ◽  
pp. 231-246 ◽  
Author(s):  
Francesca Martini ◽  
Christopher J. Bean ◽  
Gilberto Saccorotti ◽  
Fatima Viveiros ◽  
Nicolau Wallenstein
Keyword(s):  
Seismic Velocity ◽  
Coda Wave ◽  
Seasonal Cycles ◽  
Velocity Variations ◽  
Coda Wave Interferometry ◽  
Fogo Volcano

Monitoring medium changes in an intraplate setting with coda wave interferometry

2013 ◽  
Author(s):  
Virginie D'Hour ◽  
Aderson F. do Nascimento ◽  
Heleno C. de Lima Neto ◽  
Joaquim M. Ferreira ◽  
Martin Schimmel
Keyword(s):  
Coda Wave ◽  
Coda Wave Interferometry

scholarly journals Sensitivity of Ultrasonic Coda Wave Interferometry to Material Damage—Observations from a Virtual Concrete Lab

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4033
Author(s):  
Claudia Finger ◽  
Leslie Saydak ◽  
Giao Vu ◽  
Jithender J. Timothy ◽  
Günther Meschke ◽  
...  
Keyword(s):  
Elastic Moduli ◽  
Concrete Specimen ◽  
Coda Wave ◽  
Velocity Change ◽  
Damage Scenarios ◽  
Different Types ◽  
Source Signal ◽  
The Impact ◽  
Structural Scale ◽  
Coda Wave Interferometry

Ultrasonic measurements are used in civil engineering for structural health monitoring of concrete infrastructures. The late portion of the ultrasonic wavefield, the coda, is sensitive to small changes in the elastic moduli of the material. Coda Wave Interferometry (CWI) correlates these small changes in the coda with the wavefield recorded in intact, or unperturbed, concrete specimen to reveal the amount of velocity change that occurred. CWI has the potential to detect localized damages and global velocity reductions alike. In this study, the sensitivity of CWI to different types of concrete mesostructures and their damage levels is investigated numerically. Realistic numerical concrete models of concrete specimen are generated, and damage evolution is simulated using the discrete element method. In the virtual concrete lab, the simulated ultrasonic wavefield is propagated from one transducer using a realistic source signal and recorded at a second transducer. Different damage scenarios reveal a different slope in the decorrelation of waveforms with the observed reduction in velocities in the material. Finally, the impact and possible generalizations of the findings are discussed, and recommendations are given for a potential application of CWI in concrete at structural scale.

Monitoring cleaning cycles of fouled ducts using ultrasonic coda wave interferometry (CWI)

Ultrasonics ◽  
2019 ◽  
Vol 96 ◽  
pp. 253-260 ◽  
Author(s):  
B. Chen ◽  
D. Callens ◽  
P. Campistron ◽  
E. Moulin ◽  
P. Debreyne ◽  
...  
Keyword(s):  
Coda Wave ◽  
Coda Wave Interferometry

Using Ultrasonic Coda Wave Interferometry for Monitoring Stress‐Induced Changes in Concrete

2010 ◽  
Author(s):  
Parisa Shokouhi ◽  
Ernst Niederleithinger ◽  
Andreas Zoëga ◽  
Andreas Barner ◽  
Dieter Schöne
Keyword(s):  
Coda Wave ◽  
Induced Changes ◽  
Coda Wave Interferometry
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