Numerical method of active thermography for the reconstruction of back wall geometry
- The paper presents numerical methods to detect and classify defects and inhomogeneities by means of active thermography. The objective is to determine the wall thickness of structure elements with an inaccessible back wall, for example, of pipes or Containers. As test specimens we used approximately 2 cm thick PVC samples with spatial variations in the back wall geometry. Flash lamps provided the heating. To know the thickness of the wall, we used two inversion methods and compared the results achieved. One is an iterative echo defect shape method and already tested on Steel test specimens with good reconstruction results. The second one is the Levenberg-Marquardt method, applied here to thermographic data for non-destructive testing. Since data capturing using active thermography and the presented numerical methods can easily be automated, the combination of these two procedures is a promising approach providing a broad area of application.
Autor*innen: | Regina Richter, Christiane MaierhoferORCiD, Marc Kreutzbruck, M. Schilling |
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Dokumenttyp: | Beitrag zu einem Tagungsband |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | 6th Workshop 'NDT in progress' (Proceedings) |
Jahr der Erstveröffentlichung: | 2011 |
Herausgeber (Institution): | Czech society for nondestructive testing (Cndt) |
Ausgabe/Heft: | Chapter 8 |
Erste Seite: | 245 |
Letzte Seite: | 252 |
Freie Schlagwörter: | Defect shape reconstruction; Echo defect shape; Impulse-thermography; Inversion; Levenberg-Marquardt method |
Veranstaltung: | 6th Workshop 'NDT in progress' |
Veranstaltungsort: | Prague, Czech Republic |
Beginndatum der Veranstaltung: | 10.10.2011 |
Enddatum der Veranstaltung: | 12.10.2011 |
ISBN: | 978-80-214-4339-6 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 19.02.2016 |
Referierte Publikation: | Nein |