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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 23 — Aug. 10, 2004
  • pp: 4598–4602

Experimental measurements for studying angular and spectral variation of thermal infrared emissivity

Juan Cuenca and José A. Sobrino  »View Author Affiliations


Applied Optics, Vol. 43, Issue 23, pp. 4598-4602 (2004)
http://dx.doi.org/10.1364/AO.43.004598


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Abstract

One condition for precise multiangle algorithms for estimating sea and land surface temperature with the data from the Advanced Along Track Scanning Radiometer is accurate knowledge of the angular variation of surface emissivity in the thermal IR spectrum region. Today there are very few measurements of this variation. The present study is conducted to provide angular emissivity measurements for five representative samples (water, clay, sand, loam, gravel). The measurements are made in one thermal IR broadband (8–13 μm) and three narrower bands (8.2–9.2, 10.3–11.3, and 11.5–12.5 μm) at angles of 0°–60° (at 5° increments) to the surface normal. The results show a general decrease in emissivity with increasing viewing angles, with the 8.2–9.2-μm channel the most sensitive to this dependence and sand the sample showing the greatest variation.

© 2004 Optical Society of America

OCIS Codes
(000.2190) General : Experimental physics
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.6780) Instrumentation, measurement, and metrology : Temperature
(160.4760) Materials : Optical properties
(260.3060) Physical optics : Infrared

History
Original Manuscript: January 29, 2004
Revised Manuscript: May 3, 2004
Published: August 10, 2004

Citation
Juan Cuenca and José A. Sobrino, "Experimental measurements for studying angular and spectral variation of thermal infrared emissivity," Appl. Opt. 43, 4598-4602 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-23-4598


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References

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