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Applied Optics


  • Vol. 44, Iss. 18 — Jun. 20, 2005
  • pp: 3795–3804

Empirical relationships between extinction coefficient and visibility in fog

Roberto Nebuloni  »View Author Affiliations

Applied Optics, Vol. 44, Issue 18, pp. 3795-3804 (2005)

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Relationships between visibility and an extinction coefficient that is due to fog in optical windows that are free from molecular absorption are derived. The extinction coefficients in the visible (0.55 µm), the near IR (1.2 µm), and the mid IR (3.7 µm) are comparable to and roughly twice as much as that in the far IR (10.6 µm) when visibility is less than a few hundred meters. The advantage of far-IR radiation compared with shorter wavelengths grows as visibility exceeds 500 m. Correspondingly, the relationship between extinction coefficient and visibility becomes more sensitive to variations in the particle-size distribution of fog.

© 2005 Optical Society of America

OCIS Codes
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation
(010.1310) Atmospheric and oceanic optics : Atmospheric scattering
(010.3310) Atmospheric and oceanic optics : Laser beam transmission
(060.4510) Fiber optics and optical communications : Optical communications
(200.2610) Optics in computing : Free-space digital optics

Original Manuscript: November 5, 2003
Revised Manuscript: September 14, 2004
Manuscript Accepted: October 5, 2004
Published: June 20, 2005

Roberto Nebuloni, "Empirical relationships between extinction coefficient and visibility in fog," Appl. Opt. 44, 3795-3804 (2005)

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