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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
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Neutral lines and model-measurement closure in oceanic polarized light fields.

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    Area of Science:

    • Ocean optics and remote sensing
    • Polarized light phenomena in marine environments

    Background:

    • Polarization of light in the ocean offers insights into water constituents.
    • Understanding polarization formation is crucial for ocean optics and remote sensing applications.

    Purpose of the Study:

    • To measure, model, and interpret the degree and angle of linear polarization (DoLP and AoLP) and neutral points/lines in oceanic light fields.
    • To revisit open questions on non-principal plane neutral points and resolve ambiguities in Mueller matrix measurements.

    Main Methods:

    • Utilized an optical closure experiment with PixPol (polarized radiance fisheye camera) and MASCOT (in-water Mueller matrix instrument).
    • Employed Layertran, an ocean-atmosphere vectorial Monte Carlo model for simulations.
    • Analyzed empirical measurements against model predictions for polarized light fields.

    Main Results:

    • Achieved good closure between measurements and modeling for DoLP, AoLP, and neutral lines, particularly in red wavelengths (670 nm).
    • Observed systematically lower measured DoLP than modeled DoLP in blue/green wavelengths (444 nm, 500 nm), with undetermined causes.
    • Demonstrated that non-principal plane neutral points depend on atmospheric light balance and may be influenced by instrument shading (observer effect).

    Conclusions:

    • The study provides a baseline for polarimetry methods in ocean optics.
    • Results validate smooth interpolation of Mueller matrices for scattering angles >150°.
    • Highlights potential for exploiting polarized light data from NASA PACE missions (SPEXone, HARP2).