Droplet thermometry based on an optimized two dye two-color laser-induced fluorescence concept

H Ulrich, S Sigl, M Möhnle, E Berrocal, L Zigan - Frontiers in Physics, 2023 - frontiersin.org
In this work two-color laser-induced fluorescence (2c-LIF) is applied to calibrate and
measure the temperature in a micrometric monodisperse ethanol droplet chain. A dye …

Characterization of fluorescence tracers for thermometry and film thickness measurements in liquid coolants relevant for thermal management of electric and …

M Koegl, M Delwig, L Zigan - Sensors, 2022 - mdpi.com
This study investigated a novel two-color LIF (laser-induced fluorescence) technique for
thermometry in coolants relevant for electric components. In principle, this diagnostic …

3D mapping of droplet Sauter mean diameter in sprays

YN Mishra, M Koegl, K Baderschneider, B Hofbeck… - Applied Optics, 2019 - opg.optica.org
In this study, we report on the three-dimensional (3D) characterization of a spray in terms of
its droplet Sauter mean diameter (SMD) using the laser-induced fluorescence (LIF)/Mie ratio …

[HTML][HTML] Investigation of five organic dyes in ethanol and butanol for two-color laser-induced fluorescence ratio thermometry

YN Mishra, A Yoganantham, M Koegl, L Zigan - Optics, 2020 - mdpi.com
In this article, we compare absorption and temperature-dependent fluorescence spectra of
five organic dyes for 2c-LIF (two-color laser-induced fluorescence) thermometry in ethanol …

Fluorescence spectroscopy for studying evaporating droplets using the dye eosin-Y

M Koegl, C Weiß, L Zigan - Sensors, 2020 - mdpi.com
Laser-induced fluorescence (LIF) spectroscopy using dyes is frequently applied for
characterization of liquids and two-phase flows. The technique is utilized eg, for mixing …

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

M Koegl, H Dai, K Baderschneider, H Ulrich, L Zigan - Applied Optics, 2022 - opg.optica.org
The present study deals with droplet sizing based on laser-induced fluorescence (LIF) and
Mie scattering for varied polarization of the utilized laser (parallel or perpendicular). The …

Application of SLIPI-based techniques for droplet size, concentration, and liquid volume fraction mapping in sprays

YN Mishra, T Tscharntke, E Kristensson, E Berrocal - Applied Sciences, 2020 - mdpi.com
Structured laser illumination planar imaging (SLIPI)-based techniques have been employed
during the past decade for addressing multiple light scattering issues in spray imaging. In …

Characterization of fuel/water mixtures and emulsions with ethanol using laser-induced fluorescence

M Koegl, C Mull, YN Mishra, S Will, L Zigan - Applied optics, 2020 - opg.optica.org
In charged spark-ignition engines, additional water injection allows for the reduction of
temperature under stoichiometric mixture conditions. However, a higher complexity of the …

Characterization of nile red as a tracer for laser-induced fluorescence spectroscopy of gasoline and kerosene and their mixture with biofuels

M Koegl, C Mull, K Baderschneider, J Wislicenus… - Sensors, 2019 - mdpi.com
Suitable fluorescence tracers (“dyes”) are needed for the planar measurement of droplet
sizes by using a combination of laser-induced fluorescence (LIF) and Mie scattering …

Planar droplet sizing for studying the influence of ethanol admixture on the spray structure of gasoline sprays

M Koegl, YN Mishra, K Baderschneider, C Conrad… - Experiments in …, 2020 - Springer
A novel planar droplet sizing (PDS) technique based on laser-induced fluorescence (LIF)
and Mie-scattering is utilized for the characterization of the spray structure under gasoline …