Air-coupled detection of the S1-ZGV lamb mode in a concrete plate based on backward wave propagation
2013 (English)In: Review Of Progress In Quantitative Nondestructive Evaluation, Vols 32a And 32b, American Institute of Physics (AIP), 2013, 1294-1300 p.Conference paper (Refereed)
Impact Echo is commonly used to determine thickness of concrete plate like structures. The method is based on the generation and detection of the plate thickness resonance frequency, where the group velocity of the first higher symmetric Lamb mode goes to zero (S1-ZGV). When using air-coupled microphones as receivers it is hard to determine the correct resonance frequency due to low signal to noise ratio. In this study multichannel signal processing is used to identify the S1-ZGV frequency, based on backward wave propagation instead of the conventional amplitude spectrum approach.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2013. 1294-1300 p.
, AIP Conference Proceedings, ISSN 0094-243X ; 1511
Impact Echo, Lamb Waves, S1-ZGV, Backward Wave Propagation, Negative Phase Velocity
IdentifiersURN: urn:nbn:se:kth:diva-124396DOI: 10.1063/1.4789192ISI: 000320452600166ISBN: 978-0-7354-1129-6OAI: oai:DiVA.org:kth-124396DiVA: diva2:635002
39th Annual Review of Progress in Quantative Nondestructive Evaluation (QNDE), Denver, CO, Jul 15-20, 2012
QC 201307022013-07-022013-07-022013-08-15Bibliographically approved