Feasibility of passive tomography of extended defects using ambient elastic noise correlation
Résumé
Using guided waves in structural health monitoring seems interesting because of their capability to propagate over long distances. This paper shows that tomography algorithms using guided waves in plate-like structures and cross-correlation of ambient noise can be combined to process the passive tomography of a structure. This can make a very robust and low power SHM system. An active tomography image has been performed with a time-of-flight tomography algorithm using experimental data produced by piezoelectric transducers. Comparison between active signals and passive signals which come from cross-correlation of ambient noise produced by compressed air sprayed on an aluminum plate shows that it is possible to detect time-of-flight passively.
Mots clés
Acoustic noise
Compressed air
Correlation detectors
Guided electromagnetic wave propagation
Plates (structural components)
Tomography
Cross correlations
Experimental Images
Extended defect
Noise correlation
Passive tomography
Plate-like structure
Time-of-flight tomographies
Tomography algorithm
Structural health monitoring
Domaines
Physique [physics]Origine | Publication financée par une institution |
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Licence |