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Towards the Application of 2D Elastic Full-Waveform Inversion to Ultrasonic Data for Non-Destructive Testing

Ntengue Chatue, Priscilla

Abstract (englisch):
Non-destructive testing (NDT) has been used over the last years to test materials in order to assure safety and improve product reliability. It usually makes use of ultrasonic waves. This study aims to evaluate if the 2D elastic full-waveform inversion (FWI) of ultrasonic waves can reconstruct the properties of materials in a pipe embedded in a concrete block. The data were acquired at the Fraunhofer Institute for Non-Destructive Testing (IZPF). Prior to the inversion of lab data, synthetic inversion tests on numerically modelled waves are conducted to investigate the feasibility of such a test. On one hand, full data content inversion only simulates the position and shape of the pipe. On the other hand, the inversion of tapered transmitted waves partly displays the characteristics of the material in the pipe. Improvement in result leads to perform a cross talk test, which shows that the high velocity contrast between the concrete and materials in the pipe may contribute to the bad resolution imaging. In the realistic application, only tapered transmitted waves are inverted due to the complexity of late arrivals coda. It was possible to either locate the pipe to an extend but not to size it correctly or designate the material in it. ... mehr

Volltext §
DOI: 10.5445/IR/1000134081
Veröffentlicht am 25.06.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Hochschulschrift
Publikationsdatum 12.05.2021
Sprache Englisch
Identifikator KITopen-ID: 1000134081
Verlag Karlsruher Institut für Technologie (KIT)
Umfang IV, 72 S.
Art der Arbeit Abschlussarbeit - Master
Prüfungsdaten 12.5.2021
Schlagwörter Full-Waveform Inversion
Referent/Betreuer Bohlen, Professor T.
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