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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 3 — Jan. 20, 1999
  • pp: 585–593

Estimate of the incoherent-scattering contribution to lidar backscatter from clouds

David A. de Wolf, Herman W. J. Russchenberg, and Leo P. Ligthart  »View Author Affiliations


Applied Optics, Vol. 38, Issue 3, pp. 585-593 (1999)
http://dx.doi.org/10.1364/AO.38.000585


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Abstract

Lidar backscatter from clouds in the Delft University of Technology experiment is complicated by the fact that the transmitter has a narrow beam width, whereas the receiver has a much wider one. The issue here is whether reception of light scattered incoherently by cloud particles can contribute appreciably to the received power. The incoherent contribution can come from within as well as from outside the transmitter beam but in any case is due to at least two scattering processes in the cloud that are not included in the coherent forward scatter that leads to the usual exponentially attenuated contribution from single-particle backscatter. It is conceivable that a sizable fraction of the total received power within the receiver beam width is due to such incoherent-scattering processes. The ratio of this contribution to the direct (but attenuated) reflection from a single particle is estimated here by means of a distorted-Born approximation to the wave equation (with an incident cw monochromatic wave) and by comparison of the magnitude of the doubly scattered to that of the singly scattered flux. The same expressions are also obtained from a radiative-transfer formalism. The ratio underestimates incoherent multiple scattering when it is not small. Corrections that are due to changes in polarization are noted.

© 1999 Optical Society of America

OCIS Codes
(010.1310) Atmospheric and oceanic optics : Atmospheric scattering
(260.2110) Physical optics : Electromagnetic optics
(290.1090) Scattering : Aerosol and cloud effects
(290.1310) Scattering : Atmospheric scattering
(290.1350) Scattering : Backscattering
(290.4210) Scattering : Multiple scattering
(290.7050) Scattering : Turbid media

History
Original Manuscript: January 20, 1998
Revised Manuscript: October 15, 1998
Published: January 20, 1999

Citation
David A. de Wolf, Herman W. J. Russchenberg, and Leo P. Ligthart, "Estimate of the incoherent-scattering contribution to lidar backscatter from clouds," Appl. Opt. 38, 585-593 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-3-585

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