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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 18 — Jun. 20, 1999
  • pp: 3931–3936

Angular variation of thermal infrared emissivity for some natural surfaces from experimental measurements

José A. Sobrino and Juan Cuenca  »View Author Affiliations


Applied Optics, Vol. 38, Issue 18, pp. 3931-3936 (1999)
http://dx.doi.org/10.1364/AO.38.003931


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Abstract

Multiangle algorithms for estimating sea and land surface temperature with Along-Track Scanning Radiometer data require a precise knowledge of the angular variation of surface emissivity in the thermal infrared. Currently, few measurements of this variation exist. Here an experimental investigation of the angular variation of the infrared emissivity in the thermal infrared (8–14-µm) band of some representative samples was made at angles of 0°–65° (at 5° increments) to the surface normal. The results show a decrease of the emissivity with increasing viewing angle, with water showing the highest angular dependence (∼7% from 0° to 65° views). Clay, sand, slime, and gravel show variations of approximately 1–3% for the same range of views, whereas a homogeneous grass cover does not show angular dependence. Finally, we include an evaluation of the impact that these data can produce on the algorithms for determining land and sea surface temperature from double-angle views.

© 1999 Optical Society of America

OCIS Codes
(000.2190) General : Experimental physics
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(120.6780) Instrumentation, measurement, and metrology : Temperature
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(260.3060) Physical optics : Infrared
(280.0280) Remote sensing and sensors : Remote sensing and sensors

History
Original Manuscript: November 13, 1998
Revised Manuscript: March 25, 1999
Published: June 20, 1999

Citation
José A. Sobrino and Juan Cuenca, "Angular variation of thermal infrared emissivity for some natural surfaces from experimental measurements," Appl. Opt. 38, 3931-3936 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-18-3931

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