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

Günther Mayr; Gregor Thummerer; Holger Plasser; Peter Burgholzer

doi:10.1117/12.2553327

28 April 2020 Virtual wave concept with prior information for high-resolution 3D thermographic image reconstruction (Conference Presentation)

Günther Mayr, Gregor Thummerer, Holger Plasser, Peter Burgholzer

Author Affiliations +

Proceedings Volume 11409, Thermosense: Thermal Infrared Applications XLII; 114090O (2020) https://doi.org/10.1117/12.2553327
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

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.

Conference Presentation

Citation Download Citation

Günther Mayr, Gregor Thummerer, Holger Plasser, and Peter Burgholzer "Virtual wave concept with prior information for high-resolution 3D thermographic image reconstruction (Conference Presentation)", Proc. SPIE 11409, Thermosense: Thermal Infrared Applications XLII, 114090O (28 April 2020); https://doi.org/10.1117/12.2553327

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