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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 12 — Apr. 20, 2010
  • pp: 2363–2370

Numerical analysis of diameter influence on droplet fluorescence

Bruno Frackowiak and Cameron Tropea  »View Author Affiliations

Applied Optics, Vol. 49, Issue 12, pp. 2363-2370 (2010)

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Laser-induced fluorescence (LIF) is used in planar droplet sizing, assuming that the signal integrated over the droplet is proportional to its volume. Nevertheless, this assumption is rigorously valid in nonabsorbing mixtures. We performed an examination of the LIF signal with a fluorescence model, based on the Lorenz–Mie theory and on ray-tracing methods, for n-heptane droplets seeded by 3-pentanone. A parametrical study quantifies the bias caused not only by the absorption of the laser, but also by shadow zones in the droplets, which do not contribute to the fluorescence signal. Moreover, the effect of the first- and higher-order internal reflections is examined. The results of this study have immediately implications for the design of measurement techniques.

© 2010 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(260.2510) Physical optics : Fluorescence
(300.2530) Spectroscopy : Fluorescence, laser-induced
(350.4990) Other areas of optics : Particles
(080.2468) Geometric optics : First-order optics

ToC Category:
Physical Optics

Original Manuscript: December 22, 2009
Manuscript Accepted: March 14, 2010
Published: April 14, 2010

Bruno Frackowiak and Cameron Tropea, "Numerical analysis of diameter influence on droplet fluorescence," Appl. Opt. 49, 2363-2370 (2010)

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