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Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Long-range polarimetric imaging through fog.

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    This study demonstrates long-range polarimetric imaging through fog, achieving a fourfold contrast increase using polarized light. This technique enhances visibility in challenging atmospheric conditions for improved imaging.

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    Area of Science:

    • Optics and Photonics
    • Atmospheric Optics
    • Remote Sensing

    Background:

    • Polarimetric imaging utilizes light polarization properties to enhance image quality.
    • Fog and haze significantly degrade visibility in optical imaging systems.
    • Long-range imaging in atmospheric conditions presents challenges for contrast and resolution.

    Purpose of the Study:

    • To experimentally implement and evaluate long-range polarimetric imaging through fog.
    • To assess the effectiveness of polarized light in increasing source contrast under various atmospheric conditions.
    • To quantify the contrast enhancement achieved using different polarimetric signal representations.

    Main Methods:

    • Utilized a snapshot polarimetric camera with a Wollaston prism for simultaneous orthogonal polarization image acquisition.
    • Deployed an incoherent polarized light source at a distance of 1.3 km.
    • Collected extensive datasets under diverse environmental conditions (fog, haze, clear sky, day, night).

    Main Results:

    • Demonstrated a maximum fourfold increase in image contrast under bright background illumination.
    • Compared the efficiency of intensity, polarimetric difference, and polarimetric contrast for signal representation.
    • Showcased the feasibility of polarimetric imaging over kilometric distances in real-world atmospheric settings.

    Conclusions:

    • Polarimetric imaging offers a viable method for enhancing contrast in long-range imaging through fog.
    • Polarimetric difference imaging proved effective in improving source contrast, especially under challenging lighting.
    • The experimental setup validates the potential of polarimetric techniques for atmospheric remote sensing and surveillance.