TY - JOUR
T1 - Efficient defect reconstruction from temporal non-uniform pulsed thermography data using the virtual wave concept
AU - Gahleitner, Lukas
AU - Mayr, Gernot
AU - Mayr, Günther
AU - Burgholzer, Peter
AU - Cakmak, Umut
N1 - Publisher Copyright:
© 2024 The Author(s)
PY - 2024
Y1 - 2024
N2 - In this study, we present an extension of the virtual wave concept to enable photothermal reconstruction from temporal non-uniform pulsed thermography data. Therefore, we introduce a generalized discrete transformation kernel, which allows to account for arbitrary temporal sampling strategies. First, we show the evidence of the proposed strategy for analytical temperature signals. Moreover, we demonstrate the advantages of the strategy for simulated temperature signals, obtained from an orthotropic sample with defect interfaces at various depth positions. For experimental verification, we apply pulsed thermography in the pulse-echo configuration for a carbon fiber-reinforced polymer sample with different embedded defects. It can be shown that efficient time sampling in the virtual wave concept allows a significant reduction in the number of data points compared to uniform sampling, without compromising the quality of the reconstruction results.
AB - In this study, we present an extension of the virtual wave concept to enable photothermal reconstruction from temporal non-uniform pulsed thermography data. Therefore, we introduce a generalized discrete transformation kernel, which allows to account for arbitrary temporal sampling strategies. First, we show the evidence of the proposed strategy for analytical temperature signals. Moreover, we demonstrate the advantages of the strategy for simulated temperature signals, obtained from an orthotropic sample with defect interfaces at various depth positions. For experimental verification, we apply pulsed thermography in the pulse-echo configuration for a carbon fiber-reinforced polymer sample with different embedded defects. It can be shown that efficient time sampling in the virtual wave concept allows a significant reduction in the number of data points compared to uniform sampling, without compromising the quality of the reconstruction results.
KW - Defect imaging
KW - Fibrous composites
KW - Non-uniform sampling
KW - Photothermal reconstruction
KW - Pulsed thermography
KW - Virtual wave concept
UR - http://www.scopus.com/inward/record.url?scp=85200328806&partnerID=8YFLogxK
U2 - 10.1016/j.ndteint.2024.103200
DO - 10.1016/j.ndteint.2024.103200
M3 - Artikel
SN - 0963-8695
VL - 147
JO - NDT and E International
JF - NDT and E International
IS - 103200
M1 - 103200
ER -