An estimate of the average cosine for the radiance distribution resulting from a point source in the ocean

Kenneth J. Voss, Robert A. Maffione

Research output: Contribution to journalConference articlepeer-review

Abstract

We have shown in an earlier paper that by measuring the decay of the irradiance field due to a point source, the absorption coefficient of the medium can be determined. A central parameter in this method is the average cosine of the radiance distribution at each measurement point. From measurements of the Point Spread Function (PSF), an estimate of the average cosine can be determined. However, experimentally the PSF is routinely measured only to 12 degrees. We have also previously shown a method which relates the small angle PSF measurements to an empirically derived analytic formulation of the Beam Spread Function (BSF) which extends to 90 degrees. We will present an independent test of this method, and then use the BSF to determine the average cosine for varying ranges (from the point source) and water properties. In this way we can estimate how rapidly the average cosine varies, and its relative importance in the field measurements of the absorption coefficient with these techniques.

Original languageEnglish (US)
Pages (from-to)256-263
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2258
DOIs
StatePublished - Oct 26 1994
EventOcean Optics XII 1994 - Bergen, Norway
Duration: Jun 13 1994Jun 15 1994

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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