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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 1 — Jan. 1, 2007
  • pp: 67–75

Visible and near-infrared backscattering spectroscopy for sizing spherical microparticles

Lucía B. Scaffardi, Fabián A. Videla, and Daniel C. Schinca  »View Author Affiliations

Applied Optics, Vol. 46, Issue 1, pp. 67-75 (2007)

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Scattering is a useful tool for the determination of particle size in solution. In particular, spectroscopic analysis of backscattering renders the possibility of a simplified experimental setup and direct data processing using Mie theory. We show that a simple technique based on near-infrared (NIR) backscattering spectroscopy together with the development of the corresponding algorithm based on Fourier transform (FT) and Mie theory are a powerful tool for sizing microparticles in the range from 8 to 60   μm diameter. There are three wavelength intervals in the NIR, within which different diameter ranges were analyzed. In each one, the FT yields a coarse diameter value with an uncertainty dependent on the wavelength range. A more accurate value is obtained by further applying cross correlation between experimental and theoretical spectra. This latter step reduces the uncertainty in diameter determination between 30 % and 40 % , depending on wavelength interval and particle diameter. These results extend previous information on visible backscattering spectroscopy applied to sizing microparticles in the range between 1 and 24   μm diameter. This technique could be the basis for the construction of a portable and practical instrument.

© 2007 Optical Society of America

OCIS Codes
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(290.1350) Scattering : Backscattering
(300.0300) Spectroscopy : Spectroscopy
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:

Original Manuscript: April 18, 2006
Revised Manuscript: August 3, 2006
Manuscript Accepted: August 25, 2006

Lucía B. Scaffardi, Fabián A. Videla, and Daniel C. Schinca, "Visible and near-infrared backscattering spectroscopy for sizing spherical microparticles," Appl. Opt. 46, 67-75 (2007)

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