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We report experiments conducted in the field in the presence of fog, thatwere aimed at imaging under poor visibility. By means of intensity modulationat the source and two-dimensional quadrature lock-in detection by software atthe receiver, a significant enhancement of the contrast-to-noise ratio wasachieved in the imaging of beacons over hectometric distances. Further byilluminating the field of view with a modulated source, the technique helpedreveal objects that were earlier obscured due to multiple scattering of light.This method, thus, holds promise of aiding in various forms of navigation underpoor visibility due to fog.

Imaging through fog using quadrature lock-in discrimination