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Proceedings Paper

Virtual wave concept with prior information for high-resolution 3D thermographic image reconstruction (Conference Presentation)

Paper Abstract

In active thermography, the structure below the surface can be reconstructed from measured surface temperature signals. The main drawback in active thermographic is the degradation of the spatial resolution with imaging depth. Recently, we used a mathematical compensation method to transform each measured surface temperature signal into a virtual acoustic wave, which is the solution of the wave equation and therefore ultrasound image reconstruction methods can be used. This allows a 3D thermo-tomography, which combines the advantages of thermographic and ultrasonic imaging, but the degradation of spatial resolution for deeper lying structures is still significant. A possibility to overcome this degradation is to incorporate prior information such as positivity and sparsity in the reconstruction process. Based on pulsed thermography data we show that the thermographic detection limit is extendible by a factor of four.

Paper Details

Date Published: 28 April 2020
Proc. SPIE 11409, Thermosense: Thermal Infrared Applications XLII, 114090O (28 April 2020); doi: 10.1117/12.2553327
Show Author Affiliations
Günther Mayr, FH Oberösterreich (Austria)
Gregor Thummerer, FH Oberösterreich (Austria)
Holger Plasser, FH Oberösterreich (Austria)
Peter Burgholzer, Research Ctr. for Non Destructive Testing GmbH (Austria)

Published in SPIE Proceedings Vol. 11409:
Thermosense: Thermal Infrared Applications XLII
Beate Oswald-Tranta; Joseph N. Zalameda, Editor(s)

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