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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 35, Iss. 31 — Nov. 1, 1996
  • pp: 6120–6125

Temperature dependence of the band emittance for nongray bodies

Örjan Staaf, Carl G. Ribbing, and Stefan K. Andersson  »View Author Affiliations


Applied Optics, Vol. 35, Issue 31, pp. 6120-6125 (1996)
http://dx.doi.org/10.1364/AO.35.006120


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Abstract

The general problem of obtaining correct emittance values from broadband IR radiometric measurements on nongray samples is discussed. If the spectral emittance has structure in a band, the emittance, averaged over that band, will be temperature dependent, even if the spectral emittance is insensitive to the temperature change. We point out that a widely used expression, with correction for radiance from the surroundings reflected by the sample, is valid only if the spectral emittance is temperature and wavelength independent, i.e., gray. If the spectral emittance is nongray, the conventional emission factor, as determined by a broadband radiometer, is temperature dependent and the numerical value is significantly different from the averaged band emittance sought. Two algorithms are suggested to extract the correct band-averaged emittance from the temperature-dependent radiometric emission factor obtained with the conventional expression. The algorithms are demonstrated with a step model for the spectral emittance, and it is shown that the agreement with the correct average band emittance is significantly improved.

© 1996 Optical Society of America

History
Original Manuscript: November 27, 1995
Revised Manuscript: June 17, 1996
Published: November 1, 1996

Citation
Örjan Staaf, Carl G. Ribbing, and Stefan K. Andersson, "Temperature dependence of the band emittance for nongray bodies," Appl. Opt. 35, 6120-6125 (1996)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-31-6120

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