On Dispersion Compensation for GAW-Based Structural Health Monitoring

Abstract

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.

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Titel On Dispersion Compensation for GAW-Based Structural Health Monitoring
Medien Sensors
Verlag MDPI
Heft 9
Band 23
ISBN ---
Verfasser/Herausgeber Alexander Backer, Viktor Fairuschin, Prof. Dr. Klaus Stefan Drese
Seiten 4282
Veröffentlichungsdatum 2023-04-26
Projekttitel MegayachtSchaum
Zitation 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