Document Detail


Underwater light polarization and radiance fluctuations induced by surface waves.
MedLine Citation:
PMID:  16799688     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The underwater light field is an ever-changing environment. Surface waves induce variability in the radiance and the light's polarization. We examined the dependence of the polarization fluctuations associated with diffuse light (not including contribution from direct skylight) on the viewing zenith angle (30 degrees, 70 degrees, and 90 degrees), solar zenith angle (23 degrees -72 degrees), depth of 0.5-3 m, and light wavelength (380-650 nm) while observing within the azimuthal plane in the wind-wave direction. Polarization and radiance fluctuated with time. Light variability (presented by the coefficient of variation calculated over a series of fluctuations in the radiance and percent polarization, and by the standard deviation calculated over a series of fluctuations in the e-vector orientation) was highest at a viewing zenith angle of 70 degrees , depended positively on the solar zenith angle, and decreased with depth at viewing zenith angles of 30 degrees and 70 degrees . Additionally, the variability of the percent polarization was significantly higher than that of the radiance. The temporal light fluctuations offer possibilities, such as enhancing the detection of transparent and reflecting objects; however, they set constraints on the optimal underwater polarization vision by both animals and by the use of instruments.
Authors:
Shai Sabbah; Nadav Shashar
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  45     ISSN:  0003-6935     ISO Abbreviation:  Appl Opt     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-06-26     Completed Date:  2006-08-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4726-39     Citation Subset:  -    
Affiliation:
Interuniversity Institute for Marine Sciences in Eilat and Department of Evolution, Systematics and Ecology, Hebrew University of Jerusalem, Israel.
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