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Proceedings Paper

Polarization characteristics of coastal waters and their impact on in-water visibility
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Paper Abstract

Polarization characteristics of coastal waters were recently measured during a cruise on the R/V "Connecticut" in the areas of New York Harbor - Sandy Hook, NJ region using a new Stokes vector instrument developed by the Optical Remote Sensing Laboratory at CCNY. The instrument has three hyperspectral Satlantic radiance sensors each with a polarizer positioned in front of it, with polarization axes aligned at 0, 90 and 45°. The measured degrees of polarization (DOPs) and normalized radiances as a function of angle and wavelength match very well with simulated ones obtained with a Monte Carlo radiative transfer code for the atmosphere-ocean system. In order to numerically reproduce the polarized images for underwater horizontal imaging system the measured typical underwater polarized radiance was used to estimate the polarized components of the background veiling light and the blurring effects were modeled by point spread functions obtained from the measured volume scattering functions from this cruise and other typical oceanic environments. It is shown that the visibility can be improved for unpolarized target by placing a polarizer oriented orthogonally to the partially polarized direction of the veiling light before camera. The blurring effects strongly depend on the small angle scattering in the forward directions. For polarized targets the Monte Carlo simulation of slab geometry for polarized pencil light shows that the scattering medium with high g value has a very strong ability to retain the polarization status of the incident light, which can be utilized to improve the image contrasts for targets with very different polarized reflection properties.

Paper Details

Date Published: 29 April 2009
PDF: 8 pages
Proc. SPIE 7317, Ocean Sensing and Monitoring, 73170H (29 April 2009); doi: 10.1117/12.820738
Show Author Affiliations
Jing Zhou, City College, CUNY (United States)
Alberto Tonizzo, City College, CUNY (United States)
Alex Gilerson, City College, CUNY (United States)
Michael Twardowski, WET Labs, Inc. (United States)
Deric Gray, Naval Research Lab. (United States)
Alan Weidemann, Naval Research Lab. (United States)
Robert Arnone, Naval Research Lab. (United States)
Barry Gross, City College, CUNY (United States)
Fred Moshary, City College, CUNY (United States)
Sam Ahmed, City College, CUNY (United States)

Published in SPIE Proceedings Vol. 7317:
Ocean Sensing and Monitoring
Weilin (Will) Hou, Editor(s)

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