Full-frame thermographic super-resolution with 2D-structured laser heating

  • Thermographic super-resolution techniques allow the resolution of defects/inhomogeneities beyond the classical limit, which is governed by the diffusion properties of thermal wave propagation. Photothermal super-resolution is based on a combination of an experimental scanning strategy and a numerical optimization which has been proven to be superior to standard thermographic methods in the case of 1D linear defects. In this contribution, we report on the extension of this approach towards a full frame 2D photothermal super-resolution technique. The experimental approach is based on a repeated spatially structured heating using high power lasers. In a second post-processing step, several measurements are coherently combined using mathematical optimization and taking advantage of the (joint) sparsity of the defects in the sample. In our work we extend the possibilities of the method to efficiently detect and resolve defect cross sections with a fully 2D-structured blind illumination.

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  • Thermosense2021_Le_2D-Full-frame thermographic super-resolution with 2D-structured laser heating.pdf
    eng
  • Thermosense2021_Le_2D-Full-frame thermographic super-resolution with 2D-structured laser heating.mp4
    eng

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Metadaten
Autoren/innen:Julien Lecompagnon
Koautoren/innen:Samim Ahmadi, Philipp-Daniel Hirsch, Mathias Ziegler
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2021
Organisationseinheit der BAM:8 Zerstörungsfreie Prüfung
8 Zerstörungsfreie Prüfung / 8.7 Thermografische Verfahren
DDC-Klassifikation:Naturwissenschaften und Mathematik / Chemie / Analytische Chemie
Freie Schlagwörter:Image resolution; Inspection; NDT; Super-resolution; Thermography
Themenfelder/Aktivitätsfelder der BAM:Analytical Sciences
Analytical Sciences / Zerstörungsfreie Prüfung und Spektroskopie
Veranstaltung:Thermosense: Thermal Infrared Applications XLIII
Veranstaltungsort:Online meeting
Beginndatum der Veranstaltung:12.04.2021
Enddatum der Veranstaltung:16.04.2021
URL:https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11743/117430T/Full-frame-thermographic-super-resolution-with-2D-structured-laser-heating/10.1117/12.2586093.full
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:29.04.2021
Referierte Publikation:Nein