Acoustic emission source localization in anisotropic structures with diffuse field conditions using a time reversal approach

Francesco Ciampa, Michele Meo

Research output: Contribution to journalArticle

Abstract

This research work presents an in-situ imaging method for the localization of the impact point in complex anisotropic structures with diffuse field conditions, using only one passive transducer. The proposed technique is based on the time reversal approach applied to a number of waveforms stored into a database containing the experimental Green's function of the medium. The present method exploits the benefits of multiple scattering, mode conversion and boundaries reflections to achieve the focusing of the source with high resolution. The optimal re-focusing of the back propagated wave field at the impact point is accomplished through a "virtual" imaging process, which does not require any iterative algorithms and a priori knowledge of the mechanical properties of the structure. The robustness of the time reversal method is experimentally demonstrated on a stiffened composite panel and the source position can be retrieved with a high level of accuracy (error less than 3%). The simple configuration, minimal processing requirements and computational time (less than 1 sec) make this method a valid alternative to the conventional imaging structural health monitoring systems for the acoustic emission source localization. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).
Original languageEnglish
Article number798416
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume7984
DOIs
Publication statusPublished - 2011
EventHealth Monitoring of Structural and Biological Systems 2011, March 7, 2011 - March 10, 2011 - San Diego, CA, USA United States
Duration: 1 Jan 2011 → …

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Source Localization
Acoustic Emission
Time Reversal
acoustic emission
Acoustic emissions
point impact
Imaging techniques
Imaging
structural health monitoring
Multiple scattering
Structural health monitoring
Optical resolving power
Green's function
Multiple Scattering
Light sources
Transducers
transducers
waveforms
Health Monitoring
Green's functions

Cite this

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title = "Acoustic emission source localization in anisotropic structures with diffuse field conditions using a time reversal approach",
abstract = "This research work presents an in-situ imaging method for the localization of the impact point in complex anisotropic structures with diffuse field conditions, using only one passive transducer. The proposed technique is based on the time reversal approach applied to a number of waveforms stored into a database containing the experimental Green's function of the medium. The present method exploits the benefits of multiple scattering, mode conversion and boundaries reflections to achieve the focusing of the source with high resolution. The optimal re-focusing of the back propagated wave field at the impact point is accomplished through a {"}virtual{"} imaging process, which does not require any iterative algorithms and a priori knowledge of the mechanical properties of the structure. The robustness of the time reversal method is experimentally demonstrated on a stiffened composite panel and the source position can be retrieved with a high level of accuracy (error less than 3{\%}). The simple configuration, minimal processing requirements and computational time (less than 1 sec) make this method a valid alternative to the conventional imaging structural health monitoring systems for the acoustic emission source localization. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).",
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