Photothermal defect imaging in hybrid fiber metal laminates using the virtual wave concept

Lukas Gahleitner, Gregor Thummerer, Bernhard Plank, Johannes Wiedemann, Günther Mayr, Christian Hühne, Peter Burgholzer, Umut Cakmak

Research output: Contribution to journalArticlepeer-review


This study presents photothermal imaging results of subsurface material defects within fiber metal laminates utilizing the virtual wave concept. Therefore, we theoretically analyze the propagation of the virtual wave signal in a hybrid composite laminate via the method of images. For provoking local material damage, the hybrid composite sample is subjected to a defined impact loading. The results obtained from photothermal defect imaging, utilizing rectangular laser pulse excitation, are compared with results obtained from 3D x-ray computed tomography. To sum up, we demonstrate a fast, non-invasive, and easily interpretable reconstruction of defects within macroscopic hybrid composite laminates based on the virtual wave concept.

Original languageEnglish (American)
Article number074903
Number of pages13
JournalJournal of Applied Physics
Issue number7
Publication statusPublished - 21 Feb 2024


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