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Analytic beam spread function for ocean optics applications.

Richard Sanchez1, Norman J McCormick

  • 1Direction des Etudes Nucléaires, Commissariat á l'Energie Atomique de Saclay, Gif-sur-Yvette, France. richard.sanchez@cea.fr

Applied Optics
|October 25, 2002
PubMed
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A new discrete ordinates code accurately computes the beam spread function (BSF) for underwater imaging. This tool predicts detector response to scattered light without approximations, aiding visibility model development.

Area of Science:

  • Optics
  • Computational Physics
  • Oceanography

Background:

  • Accurate modeling of light propagation in water is crucial for underwater imaging and visibility studies.
  • Existing methods often rely on approximations like small-angle scattering or computationally intensive Monte Carlo simulations.

Purpose of the Study:

  • To develop a novel discrete ordinates code for computing the beam spread function (BSF).
  • To predict detector response to collimated light beams in various aquatic environments without small-angle scattering approximations or Monte Carlo methods.

Main Methods:

  • Development of a discrete ordinates code for radiative transfer calculations.
  • Computation of the beam spread function (BSF) for different water types (clear ocean, coastal ocean, turbid harbor).

Related Experiment Videos

  • Analysis of detector response based on distance, angle to the beam, and detector orientation.

    • Main Results:

    • The code successfully computes the BSF, predicting significant changes (six orders of magnitude) in detector response due to scattered photons.
    • Detector response was found to be highly sensitive to location but less sensitive to orientation.
    • Numerical results were obtained for diverse water models simulating oceanic and harbor environments.

    Conclusions:

    • The developed discrete ordinates code offers a robust method for calculating BSF and predicting underwater detector responses.
    • This capability is vital for assessing the sensitivity of underwater imaging systems and visibility models to scattered light.
    • The findings support improved interpretation of time-independent underwater imaging and visibility data.