Abstract

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

Numerical evaluation of droplet sizing based on the ratio of fluorescent and scattered light intensities (LIF/Mie technique)

Georgios Charalampous and Yannis Hardalupas
Appl. Opt. 50(9) 1197-1209 (2011)

Polarization-dependent LIF/Mie ratio for sizing of micrometric ethanol droplets doped with Nile red

Matthias Koegl, Hongfei Dai, Kevin Baderschneider, Hannah Ulrich, and Lars Zigan
Appl. Opt. 61(14) 4204-4214 (2022)

3D mapping of droplet Sauter mean diameter in sprays

Yogeshwar Nath Mishra, Matthias Koegl, Kevin Baderschneider, Bernhard Hofbeck, Edouard Berrocal, Chris Conrad, Stefan will, and Lars Zigan
Appl. Opt. 58(14) 3775-3783 (2019)

Method to reduce errors of droplet sizing based on the ratio of fluorescent and scattered light intensities (laser-induced fluorescence/Mie technique)

Georgios Charalampous and Yannis Hardalupas
Appl. Opt. 50(20) 3622-3637 (2011)

Analysis of LIF and Mie signals from single micrometric droplets for instantaneous droplet sizing in sprays

Matthias Koegl, Bernhard Hofbeck, Kevin Baderschneider, Yogeshwar Nath Mishra, Franz J. T. Huber, Edouard Berrocal, Stefan Will, and Lars Zigan
Opt. Express 26(24) 31750-31766 (2018)