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Applied Optics

Applied Optics


  • Vol. 17, Iss. 19 — Oct. 1, 1978
  • pp: 3169–3176

Forwardscattering corrections for optical extinction measurements in aerosol media. 2: Polydispersions

Adarsh Deepak and Michael A. Box  »View Author Affiliations

Applied Optics, Vol. 17, Issue 19, pp. 3169-3176 (1978)

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This paper, second of two parts, presents a parametric study of the forwardscattering corrections for experimentally measured optical extinction coefficients in polydisperse particulate media, since some forward scattered light invariably enters, along with the direct beam, into the finite aperture of the detector. Forwardscattering corrections are computed by two methods: (1) using the exact Mie theory, and (2) the approximate Rayleigh diffraction formula for spherical particles. A parametric study of the dependence of the corrections on mode radii, real and imaginary parts of the complex refractive index, and half-angle of the detector’s view cone has been carried out for three different size distribution functions of the modified Gamma type. In addition, a study has been carried out to investigate the range of these parameters in which the approximate formulation is valid. The agreement is especially good for small-view cone angles and large particles, which improves significantly for slightly absorbing aerosol particles. Also discussed is the dependence of these corrections on the experimental design of the transmissometer systems.

© 1978 Optical Society of America

Original Manuscript: December 22, 1977
Published: October 1, 1978

Adarsh Deepak and Michael A. Box, "Forwardscattering corrections for optical extinction measurements in aerosol media. 2: Polydispersions," Appl. Opt. 17, 3169-3176 (1978)

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  1. A. Deepak, M. A. Box, “Forwardscattering Corrections for Optical Extinction Measurements in Aerosol Media. Part 1: Monodispersions” Appl. Opt. 17, 2900 (1978). [CrossRef] [PubMed]
  2. D. Deirmendjian, Electromagnetic Scattering on Spherical Polydispersions (Elsevier, New York, 1969).
  3. A. Deepak, O. H. Vaughan, Appl. Opt. 17, 374 (1977). [CrossRef]
  4. A. E. S. Green, A. Deepak, B. J. Lipofsky, Appl. Opt. 10, 1263 (1971). [CrossRef] [PubMed]
  5. A. Deepak, G. P. Box, “Analytical Modeling of Aerosol Size Distributions” (Paper IFAORS-106-77, in preparation).
  6. H. C. van de Hulst, Light Scattering by Small Particles (Wiley, New York, 1957).

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