TY - JOUR
T1 - 3D photothermal imaging of subsurface defects in composite materials
AU - Thummerer, G.
AU - Mayr, G.
AU - Burgholzer, P.
N1 - Funding Information:
The financial support by the Austrian Federal Ministry of Science, Research and Economy and the National Foundation for Research, Technology and Development is gratefully acknowledged. Furthermore, this work has been supported by the project multimodal and in-situ characterization of inhomogeneous materials (MiCi), by the Federal Government of Upper Austria and the European Regional Development Fund (EFRE) in the framework of the EU-program IWB2020. Signal and data processing was funded by the Austrian Science Fund ( FWF ), project P 33019-N.
Publisher Copyright:
© 2021 The Author(s)
PY - 2021/9
Y1 - 2021/9
N2 - In this work, we show the application of the virtual wave concept for 3D “pulse-echo” photothermal defect imaging in anisotropic materials. We consider a woven and a unidirectional carbon fiber reinforced material including flat bottom holes with varying diameter-to-depth ratios. We discuss the characteristics of the virtual wave signal due to disturbed heat diffusion caused by a defect and the resulting consequences for our defect reconstruction method regarding the incorporation of prior information. In addition, we optimize the virtual wave concept in terms of computation time by performing a parameter study and a physical-based derivation that suggest reasonable values for the temporal and spatial discretization, respectively. The paper presents a very fast, easily interpretable and efficient 3D reconstruction tool for active thermography testing of anisotropic materials.
AB - In this work, we show the application of the virtual wave concept for 3D “pulse-echo” photothermal defect imaging in anisotropic materials. We consider a woven and a unidirectional carbon fiber reinforced material including flat bottom holes with varying diameter-to-depth ratios. We discuss the characteristics of the virtual wave signal due to disturbed heat diffusion caused by a defect and the resulting consequences for our defect reconstruction method regarding the incorporation of prior information. In addition, we optimize the virtual wave concept in terms of computation time by performing a parameter study and a physical-based derivation that suggest reasonable values for the temporal and spatial discretization, respectively. The paper presents a very fast, easily interpretable and efficient 3D reconstruction tool for active thermography testing of anisotropic materials.
KW - Active thermography
KW - Carbon fiber reinforced polymer
KW - Image reconstruction
KW - Photothermal technique
KW - Virtual wave concept
UR - http://www.scopus.com/inward/record.url?scp=85107629659&partnerID=8YFLogxK
U2 - 10.1016/j.ndteint.2021.102476
DO - 10.1016/j.ndteint.2021.102476
M3 - Article
AN - SCOPUS:85107629659
SN - 0963-8695
VL - 122
JO - NDT and E International
JF - NDT and E International
M1 - 102476
ER -