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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 35 — Dec. 10, 2007
  • pp: 8453–8460

Estimation of optical constants from multiple-scattered light using approximations for single particle scattering characteristics

Maria A. Velazco-Roa and Suresh N. Thennadil  »View Author Affiliations


Applied Optics, Vol. 46, Issue 35, pp. 8453-8460 (2007)
http://dx.doi.org/10.1364/AO.46.008453


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Abstract

The inversion of multiple-scattered light measurements to extract the optical constant (complex refractive index) is computationally intensive. A significant portion of this time is due to the effort required for computing the single particle characteristics (absorption and scattering cross sections, anisotropy factor, and the phase function). We investigate approximations for computing these characteristics so as to significantly speed up the calculations without introducing large inaccuracies. Two suspensions of spherical particles viz., polystyrene and poly(methyl methacrylate) were used for this investigation. It was found that using the exact Mie theory to compute the absorption and scattering cross sections and the anisotropy factor with the phase function computed using the Henyey–Greenstein approximation yielded the best results. Analysis suggests that errors in the phase functions and thus in the estimated optical constants depend mainly on how closely the approximations match the Mie phase function at small scattering angles.

© 2007 Optical Society of America

OCIS Codes
(290.3030) Scattering : Index measurements
(290.4020) Scattering : Mie theory
(290.4210) Scattering : Multiple scattering
(290.5820) Scattering : Scattering measurements
(290.5850) Scattering : Scattering, particles
(290.5825) Scattering : Scattering theory

ToC Category:
Scattering

History
Original Manuscript: August 6, 2007
Revised Manuscript: October 23, 2007
Manuscript Accepted: October 26, 2007
Published: December 3, 2007

Virtual Issues
Vol. 3, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Maria A. Velazco-Roa and Suresh N. Thennadil, "Estimation of optical constants from multiple-scattered light using approximations for single particle scattering characteristics," Appl. Opt. 46, 8453-8460 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-35-8453

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