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On Dispersion Compensation for GAW-Based Structural Health Monitoring
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<p>Guided acoustic waves (GAW) have proven to be a useful tool for structural health monitoring (SHM). However, the dispersive nature of commonly used Lamb waves compromises the spatial resolution making it difficult to detect small or weakly reflective defects. Here we demonstrate an approach that can compensate for the dispersive effects, allowing advanced algorithms to be used with significantly higher signal-to-noise ratio and spatial resolution. In this paper, the sign coherence factor (SCF) extension of the total focusing method (TFM) algorithm is used. The effectiveness is examined by numerical simulation and experimentally demonstrated by detecting weakly reflective layers with a highly dispersive A0 mode on an aluminum plate, which are not detectable without compensating for the dispersion effects.</p>
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Backer, Alexander; Fairuschin, Viktor; Drese, Klaus Stefan (2023): On Dispersion Compensation for GAW-Based Structural Health Monitoring
. Sensors 23 (9), S. 4282. DOI: 10.3390/s23094282
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The website of Coburg University of Applied Sciences was translated using translation software provided by a third-party provider such as DeepL. The official text is the German version of the website. No liability is assumed, either explicitly or implicitly, for the accuracy, reliability, or correctness of the translations into another language.

On Dispersion Compensation for GAW-Based Structural Health Monitoring

Guided acoustic waves (GAW) have proven to be a useful tool for structural health monitoring (SHM). However, the dispersive nature of commonly used Lamb waves compromises the spatial resolution making it difficult to detect small or weakly reflective defects. Here we demonstrate an approach that can compensate for the dispersive effects, allowing advanced algorithms to be used with significantly higher signal-to-noise ratio and spatial resolution. In this paper, the sign coherence factor (SCF) extension of the total focusing method (TFM) algorithm is used. The effectiveness is examined by numerical simulation and experimentally demonstrated by detecting weakly reflective layers with a highly dispersive A0 mode on an aluminum plate, which are not detectable without compensating for the dispersion effects.

Titel:

On Dispersion Compensation for GAW-Based Structural Health Monitoring

Veröffentlichungsdatum:

26.04.2023

Publikationsart:

Zeitschriftenbeiträge

Forschungsschwerpunkt:

HRK Schwerpunkt Sensorik und Analytik

Medien:

Sensors

DOI:

https://doi.org/10.3390/s23094282

Weblink:

Heft:

9

Band:

23

Artikelnummer:

ISBN:

Autoren:

Alexander Backer, Viktor Fairuschin, Klaus Stefan Drese

Medien:

Sensors

Herausgeber:

MDPI

Seiten:

4282

Open Access:

Peer reviewed:

Ja

Zitierung:

Backer, Alexander; Fairuschin, Viktor; Drese, Klaus Stefan (2023): On Dispersion Compensation for GAW-Based Structural Health Monitoring . Sensors 23 (9), S. 4282. DOI: 10.3390/s23094282

Autoren:

Alexander Backer, Viktor Fairuschin, Klaus Stefan Drese