Effect of Surface Unevenness on In Situ Measurements and Theoretical Simulation in Non-Contact Surface Wave Measurements Using a Rolling Microphone Array
2015 (English)In: NDT-CE2015 proceedings, Berlin: NDT , 2015Conference paper (Refereed)
Non-destructive seismic testing using air-coupled microphones is today an attractive alternative to the more conventional stationary accelerometer testing, in order to perform fast and reliable material characterization on pavement structures. A multichannel microphone array enables fast mobile data collection using a rolling trolley. It is essential that the microphone array and the material surface are perfectly aligned to receive a correct result. This study presents estimations of the calculation errors due to misalignments between the microphone array and the material surface. It is shown that even small misalignments can cause large errors. A realistic pavement roughness is simulated in order to quantify the errors in different situations and for different materials (stiffness). A simple solution to correct the errors under certain circumstances is also presented.
Place, publisher, year, edition, pages
Berlin: NDT , 2015.
Surface waves, surface unevenness, non-contact measurements, air-coupled measurements
IdentifiersURN: urn:nbn:se:kth:diva-185950OAI: oai:DiVA.org:kth-185950DiVA: diva2:924912
International Symposium Non-Destructive Testing in Civil Engineering, September 15-17,2015 Berlin, Germany
QC 201605032016-04-292016-04-292016-05-03Bibliographically approved