Underwater polarization characteristics and their impact on water visibility

Jing Zhou; Alberto Tonizzo; Alex Gilerson; Barry Gross; Fred Moshary; Sam Ahmed

doi:10.1117/12.851021

20 April 2010 Underwater polarization characteristics and their impact on water visibility

Jing Zhou, Alberto Tonizzo, Alex Gilerson, Barry Gross, Fred Moshary, Sam Ahmed

Proceedings Volume 7678, Ocean Sensing and Monitoring II; 76780J (2010) https://doi.org/10.1117/12.851021
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

In this paper we examine the impact of measured underwater polarization characteristics on visibility. Underwater characteristics were measured both in the principal plane and outside the principal plane, with data collected during several cruises in the Chesapeake/Virginia and New York Harbor/Hudson River areas using a multi-angular hyperspectral sensor system. This system, recently developed by us, consists of three hyperspectral Satlantic radiance sensors, each with a polarizer positioned in front of it, and with polarization axes aligned at 0, 90 and 45 deg. Underwater measurements are made with scattering angles from 0-180 degrees with respect to the solar illumination. At the same time as the hyperspectral measurements are made, the inherent optical properties such as absorption and attenuation were also recorded. The waters studied varied from clear open ocean water with attenuation of less than 0.25m^-1 at 550nm c (550), to turbid coastal waters with a c(550) of more than 4m^-1. In order to examine the extent that polarization techniques can help to improve underwater visibility in these types of field conditions, we computed the related modulation transfer functions from the polarized field measurements, and included the examination of the impact of scattered polarized veiling light, inherent in the field data. Various water parameters are then explored to examine the impact of the polarization of the background light in the principal plane on underwater visibility.

Citation Download Citation

Jing Zhou, Alberto Tonizzo, Alex Gilerson, Barry Gross, Fred Moshary, and Sam Ahmed "Underwater polarization characteristics and their impact on water visibility", Proc. SPIE 7678, Ocean Sensing and Monitoring II, 76780J (20 April 2010); https://doi.org/10.1117/12.851021

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KEYWORDS

Scattering

Polarization

Light scattering

Polarizers

Visibility

Cameras

Modulation transfer functions

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