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Efficient Monte Carlo simulation reveals significant multiple scattering errors in underwater angular scattering

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    Multiple scattering significantly impacts optical instrument accuracy. Advanced Monte Carlo simulations show errors are negligible only for low scattering coefficients (<1 m⁻¹), increasing with forward-peaked phase functions.

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    Area of Science:

    • Optical physics
    • Ocean optics
    • Instrumentation

    Background:

    • Multiple scattering errors affect optical measurements.
    • LISST-VSF instruments measure volume scattering functions.
    • Accurate optical instrumentation is crucial for various scientific applications.

    Purpose of the Study:

    • To improve a Monte Carlo model for simulating volume scattering functions.
    • To analyze multiple scattering errors using variance reduction techniques.
    • To assess the impact of scattering coefficients and phase functions on measurement accuracy.

    Main Methods:

    • Implemented variance reduction methods to enhance a Monte Carlo simulation.
    • Simulated volume scattering functions using Fournier-Forand (FF) phase functions.
    • Analyzed the impact of multiple scattering on key optical parameters.

    Main Results:

    • Achieved over a tenfold increase in simulation efficiency.
    • Demonstrated significant multiple scattering errors in scattering and backscattering coefficients.
    • Identified that errors are negligible (<10%) only for scattering coefficients below 1 m⁻¹.
    • Showed errors increase with higher scattering coefficients and more forward-peaked phase functions.

    Conclusions:

    • Multiple scattering introduces substantial errors in optical measurements, particularly at higher scattering coefficients.
    • The accuracy of LISST-VSF instruments is compromised by multiple scattering effects.
    • Accurate simulation and error correction are essential for reliable optical instrumentation.