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Applied Optics

Applied Optics


  • Vol. 38, Iss. 15 — May. 20, 1999
  • pp: 3157–3165

Degree of linear polarization in spectral radiances from water-viewing infrared radiometers

Joseph A. Shaw  »View Author Affiliations

Applied Optics, Vol. 38, Issue 15, pp. 3157-3165 (1999)

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Infrared radiances from water become partially polarized at oblique viewing angles through both emission and reflection. I describe computer simulations that show how the state of polarization for water varies with environmental conditions over a wavelength range of 3–15 µm with 0.05-µm resolution. Polarization at wavelengths longer than approximately 4 µm generally is negative (p, or vertical) and increases with incidence angle up to approximately 75°, beyond which the horizontally polarized reflected atmospheric radiance begins to dominate the surface emission. The highest p polarization (∼4–10%) is found in the atmospheric window regions of approximately 4–5 and 8–14 µm. In the 3–5-µm spectral band, especially between 3 and 4 µm, reflected atmospheric radiance usually is greater than surface emission, resulting in a net s polarization (horizontal). The results of these simulations agree well with broadband measurements of the degree of polarization for a water surface viewed at nadir angles of 0–75°.

© 1999 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(010.7340) Atmospheric and oceanic optics : Water
(260.3060) Physical optics : Infrared
(260.5430) Physical optics : Polarization
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(300.6340) Spectroscopy : Spectroscopy, infrared

Original Manuscript: September 21, 1998
Revised Manuscript: March 2, 1999
Published: May 20, 1999

Joseph A. Shaw, "Degree of linear polarization in spectral radiances from water-viewing infrared radiometers," Appl. Opt. 38, 3157-3165 (1999)

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