Full-frame thermographic super-resolution with 2D-structured laser heating

Julien Lecompagnon; Samim Ahmadi; Philipp Hirsch; Mathias Ziegler

doi:10.1117/12.2586093

12 April 2021 Full-frame thermographic super-resolution with 2D-structured laser heating

Julien Lecompagnon, Samim Ahmadi, Philipp Hirsch, Mathias Ziegler

Proceedings Volume 11743, Thermosense: Thermal Infrared Applications XLIII; 117430T (2021) https://doi.org/10.1117/12.2586093
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Thermographic super-resolution techniques allow the resolution of defects/inhomogeneities beyond the classical limit, which is governed by the diffusion properties of thermal wave propagation. Photothermal super-resolution is based on a combination of an experimental scanning strategy and a numerical optimization which has been proven to be superior to standard thermographic methods in the case of 1D linear defects. In this contribution, we report on the extension of this approach towards a full frame 2D photothermal super-resolution technique. The experimental approach is based on a repeated spatially structured heating using high power lasers. In a second post-processing step, several measurements are coherently combined using mathematical optimization and taking advantage of the (joint) sparsity of the defects in the sample. In our work we extend the possibilities of the method to efficiently detect and resolve defect cross sections with a fully 2D-structured blind illumination.

Conference Presentation

Citation Download Citation

Julien Lecompagnon, Samim Ahmadi, Philipp Hirsch, and Mathias Ziegler "Full-frame thermographic super-resolution with 2D-structured laser heating", Proc. SPIE 11743, Thermosense: Thermal Infrared Applications XLIII, 117430T (12 April 2021); https://doi.org/10.1117/12.2586093

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