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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 24 — Aug. 20, 1999
  • pp: 5229–5231

Size parameter for thermally emitting particles

David K. Lynch and Stephan Mazuk  »View Author Affiliations


Applied Optics, Vol. 38, Issue 24, pp. 5229-5231 (1999)
http://dx.doi.org/10.1364/AO.38.005229


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Abstract

For thermal emission from particles the conventional size parameter X = 2πa/λ does not distinguish between small and large particles. We show that the opacity parameter Ω = 4πka/λ = 2kX is a more accurate means of demarcating the two emission regimes. Ω is approximately equal to the particle’s mean optical depth, and it can be derived from both scattering theory and geometrical optics.

© 1999 Optical Society of America

OCIS Codes
(290.2200) Scattering : Extinction
(290.4020) Scattering : Mie theory
(290.5850) Scattering : Scattering, particles

History
Original Manuscript: March 2, 1999
Revised Manuscript: May 21, 1999
Published: August 20, 1999

Citation
David K. Lynch and Stephan Mazuk, "Size parameter for thermally emitting particles," Appl. Opt. 38, 5229-5231 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-24-5229

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