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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 35, Iss. 36 — Dec. 20, 1996
  • pp: 7144–7150

Prediction of apparent extinction for optical transmission through rain

H. Vasseur and C. J. Gibbins  »View Author Affiliations


Applied Optics, Vol. 35, Issue 36, pp. 7144-7150 (1996)
http://dx.doi.org/10.1364/AO.35.007144


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Abstract

At optical wavelengths, geometrical optics holds that the extinction efficiency of raindrops is equal to two. This approximation yields a wavelength-independent extinction coefficient that, however, can hardly be used to predict accurately rain extinction measured in optical transmissions. Actually, in addition to the extinct direct incoming light, a significant part of the power scattered by the rain particles reaches the receiver. This leads to a reduced apparent extinction that depends on both rain characteristics and link parameters. A simple method is proposed to evaluate this apparent extinction. It accounts for the additional scattered power that enters the receiver when one considers the forward-scattering pattern of the raindrops as well as the multiple-scattering effects using, respectively, the Fraunhofer diffraction and Twersky theory. It results in a direct analytical formula that enables a quick and accurate estimation of the rain apparent extinction and highlights the influence of the link parameters. Predictions of apparent extinction through rain are found in excellent agreement with measurements in the visible and IR regions.

© 1996 Optical Society of America

History
Original Manuscript: January 16, 1996
Revised Manuscript: May 15, 1996
Published: December 20, 1996

Citation
H. Vasseur and C. J. Gibbins, "Prediction of apparent extinction for optical transmission through rain," Appl. Opt. 35, 7144-7150 (1996)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-36-7144


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