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Imaging through fog using quadrature lock-in discrimination

Abstract : We report experiments conducted in the field in the presence of fog, that were aimed at imaging under poor visibility. By means of intensity modulation at the source and twodimensional quadrature lock-in detection by software at the receiver, a significant enhancement of the contrast-to-noise ratio was achieved in the imaging of beacons over hectometric distances. Further by illuminating the field of view with a modulated source, the technique helped reveal objects that were earlier obscured due to multiple scattering of light. This method, thus, holds promise of aiding in various forms of navigation under poor visibility due to fog.
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Contributor : Fabien Bretenaker <>
Submitted on : Wednesday, May 12, 2021 - 9:19:24 AM
Last modification on : Monday, July 12, 2021 - 10:14:07 AM


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Shashank Kumar, Bapan Debnath, Meena M. S, Julien Fade, Sankar Dhar, et al.. Imaging through fog using quadrature lock-in discrimination. OSA Continuum, OSA Publishing, 2021, 4, pp.1649-1657. ⟨10.1364/osac.425499⟩. ⟨hal-03224905⟩



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