Investigations on photothermal super resolution reconstruction using 2D-structured illumination patterns

Julien Lecompagnon; Samim Ahmadi; Philipp Hirsch; Christian Rupprecht; Mathias Ziegler

doi:10.1117/12.2603838

14 November 2021 Investigations on photothermal super resolution reconstruction using 2D-structured illumination patterns

Julien Lecompagnon, Samim Ahmadi, Philipp Hirsch, Christian Rupprecht, Mathias Ziegler

Author Affiliations +

Proceedings Volume 11914, SPIE Future Sensing Technologies 2021; 119140S (2021) https://doi.org/10.1117/12.2603838
Event: SPIE Future Sensing Technologies, 2021, Online Only

Abstract

Active thermography as a nondestructive testing modality suffers greatly from the limitations imposed by the diffusive nature of heat conduction in solids. As a rule of thumb, the detection and resolution of internal defects/inhomogeneities is limited to a defect depth to defect size ratio greater than or equal to one. Earlier, we demonstrated that this classical limit can be overcome for 1D and 2D defect geometries by using photothermal laser-scanning super resolution. In this work we report a new experimental approach using 2D spatially structured illumination patterns in conjunction with compressed sensing and computational imaging methods to significantly decrease the experimental complexity and make the method viable for investigating larger regions of interest.

Conference Presentation

Citation Download Citation

Julien Lecompagnon, Samim Ahmadi, Philipp Hirsch, Christian Rupprecht, and Mathias Ziegler "Investigations on photothermal super resolution reconstruction using 2D-structured illumination patterns", Proc. SPIE 11914, SPIE Future Sensing Technologies 2021, 119140S (14 November 2021); https://doi.org/10.1117/12.2603838

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