Long wave infrared wavefront sensing through a thin diffuser

Anwesh Bhattacharya; Pascal Berto; Valentina Krachmalnicoff; Ignacio Izeddin; Gilles Tessier; Yannick De Wilde

doi:10.1117/12.2618788

27 May 2022 Long wave infrared wavefront sensing through a thin diffuser

Anwesh Bhattacharya, Pascal Berto, Valentina Krachmalnicoff, Ignacio Izeddin, Gilles Tessier, Yannick De Wilde

Proceedings Volume 12109, Thermosense: Thermal Infrared Applications XLIV; 1210904 (2022) https://doi.org/10.1117/12.2618788
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

Long wave infrared (LWIR) radiation (7-14 μm) allows illumination-less imaging, and spectroscopic chemical identification. Infrared imaging is ubiquitous in defense thermography, airborne and atmospheric sensing, fault detection, and medical testing. Visible speckle imaging can successfully image through complex scattering media. We describe a novel broadband LWIR speckle imaging-based wavefront sensor, utilizing a thin diffuser with an uncooled microbolometric camera. Due to the thin diffuser, local phase gradients produce speckle deformations which are estimated by a rapid image registration algorithm to generate a phase gradient map, whose 2-D integration yields the reconstructed wavefront. We demonstrate LWIR wavefront reconstruction using our setup in infrared optical samples, with future applications for LWIR imaging through visually non-transparent materials.

Conference Presentation

Citation Download Citation

Anwesh Bhattacharya, Pascal Berto, Valentina Krachmalnicoff, Ignacio Izeddin, Gilles Tessier, and Yannick De Wilde "Long wave infrared wavefront sensing through a thin diffuser", Proc. SPIE 12109, Thermosense: Thermal Infrared Applications XLIV, 1210904 (27 May 2022); https://doi.org/10.1117/12.2618788

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