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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 10 — Apr. 1, 2003
  • pp: 1839–1846

Systematic errors in the measurement of emissivity caused by directional effects

Abraham Kribus, Irna Vishnevetsky, Eyal Rotenberg, and Dan Yakir  »View Author Affiliations


Applied Optics, Vol. 42, Issue 10, pp. 1839-1846 (2003)
http://dx.doi.org/10.1364/AO.42.001839


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Abstract

Accurate knowledge of surface emissivity is essential for applications in remote sensing (remote temperature measurement), radiative transport, and modeling of environmental energy balances. Direct measurements of surface emissivity are difficult when there is considerable background radiation at the same wavelength as the emitted radiation. This occurs, for example, when objects at temperatures near room temperature are measured in a terrestrial environment by use of the infrared 8–14-μm band. This problem is usually treated by assumption of a perfectly diffuse surface or of diffuse background radiation. However, real surfaces and actual background radiation are not diffuse; therefore there will be a systematic measurement error. It is demonstrated that, in some cases, the deviations from a diffuse behavior lead to large errors in the measured emissivity. Past measurements made with simplifying assumptions should therefore be reevaluated and corrected. Recommendations are presented for improving experimental procedures in emissivity measurement.

© 2003 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(260.3060) Physical optics : Infrared
(300.2140) Spectroscopy : Emission

History
Original Manuscript: June 18, 2002
Revised Manuscript: December 4, 2002
Published: April 1, 2003

Citation
Abraham Kribus, Irna Vishnevetsky, Eyal Rotenberg, and Dan Yakir, "Systematic errors in the measurement of emissivity caused by directional effects," Appl. Opt. 42, 1839-1846 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-10-1839

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