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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 36, Iss. 12 — Apr. 20, 1997
  • pp: 2642–2649

Nephelometer optical response model for the interpretation of atmospheric aerosol measurements

James M. Rosen, Ronald G. Pinnick, and Dennis M. Garvey  »View Author Affiliations


Applied Optics, Vol. 36, Issue 12, pp. 2642-2649 (1997)
http://dx.doi.org/10.1364/AO.36.002642


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Abstract

A numerical model evaluating the response of a typical integrating nephelometer is described. The model incorporates the actual scattering geometry as well as the effects of a finite light source, detector size, and a nonideal Lambertian diffuser. An angular scattering weighting function is introduced to provide a tractable approach in numerical calculations and easy application. Using established size distribution ensembles associated with a few representative aerosol types, we compare the calculated response of a real nephelometer with that of an ideal, or perfect, nephelometer. The results indicate that, frequently, the nephelometer-produced aerosol-scattering coefficient is of the order of 10–20% too small; but for some naturally occurring aerosols, the difference may be as large as 40–50%. For a multiple-wavelength nephelometer, the response model can be employed to estimate the expected error in the aerosol-scattering coefficients directly from the measurements themselves.

© 1997 Optical Society of America

History
Original Manuscript: May 28, 1996
Revised Manuscript: September 30, 1996
Published: April 20, 1997

Citation
James M. Rosen, Ronald G. Pinnick, and Dennis M. Garvey, "Nephelometer optical response model for the interpretation of atmospheric aerosol measurements," Appl. Opt. 36, 2642-2649 (1997)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-36-12-2642

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