Measurement of colloid concentration in drops using the time-shift technique
Lingxi Li  1, *@  , Can Li  2@  , Simon Rosenkranz  3@  , Walter Schäfer  3@  , Cameron Tropea  4@  
1 : Institute of Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt
Alarich-Weiss-Straße 10 64287 Darmstadt -  Germany
2 : Zhejiang University
38 Zheda Rd, Xihu Qu, Hangzhou Shi, Zhejiang Sheng, China, 310027 -  China
3 : AOM-Systems GmbH
Benzstraße 4, 64646 Heppenheim (Bergstraße) -  Germany
4 : Institute of Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt
Alarich-Weiss-Straße 10, 64287 Darmstadt -  Germany
* : Corresponding author

This study is devoted to the measurement of colloid concentration in drops, as they occur in numerous industrial applications, such as paint sprays, ink-jet printing or the production of pharmaceutical products. A Monte Carlo ray-tracing approach has been used to study the light scattering from such particles, in which the polarization and intensity of all rays impinging onto a defined detector aperture are collected, allowing the signal generation arising from the drop passing through a plane wave or focused Gaussian beam to be simulated. When using a highly focused incident beam, the scattering corresponds to the optical arrangement of the time-shift technique, allowing the measurement of drops with suspended particles to be explored. For validation of the ray-tracing code, comparisons between the simulated time-shift signal and the measured time-shift signal were made, yielding excellent agreement. A model has been formulated to describe these signals; hence, to allow colloid concentration to be estimated directly from the received time-shift signals.

 

 


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