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Droplet sizing in atomizing sprays using polarization ratio with structured laser illumination planar imaging
Optics Letters
|August 1, 2023
Summary
This study introduces a new method using structured laser illumination and a telecentric objective to accurately measure droplet size in dense sprays, overcoming challenges of multiple light scattering.
Area of Science:
- Fluid Dynamics
- Optical Measurement Techniques
Background:
- The polarization ratio technique is established for characterizing droplet size (D21) in dilute sprays.
- Optically dense sprays present challenges for this technique due to multiple light scattering and signal angular dependence.
Purpose of the Study:
- To develop a novel method for accurate droplet size measurement in optically dense sprays.
- To overcome limitations of the polarization ratio technique in challenging spray environments.
Main Methods:
- Combines a telecentric objective with structured laser illumination.
- Optimizes light detection and suppresses intensity from multiple scattering.
- Applies the polarization ratio technique to atomizing sprays.
Main Results:
- Successfully adapted the polarization ratio technique for optically dense sprays.
- Demonstrated accurate droplet size measurement in hollow-cone water sprays.
- Validated the method for sprays with optical depths up to three at various injection pressures (30, 50, 70 bar).
Conclusions:
- The novel method effectively addresses multiple scattering and angular dependence issues.
- Enables reliable droplet size characterization in challenging atomizing sprays.
- Offers a promising solution for comprehensive spray analysis.
