Title: SLIPI-polarization ratio imaging: A new technique for sizing droplets in optically dense sprays
| Date | - |
| Heure | 13h30 - 17h00 |
| Adresse | hall Carnot |
| Contact | |
Abstract:
Previous research has shown that the polarization ratio technique allows sizing droplets generated from dilute spray systems. The polarization ratio technique is based on the acquisition of the perpendicular and parallel polarized components of Lorenz-Mie scattered light, which ratio is proportional to the surface mean diameter, D21. One of the main advantage of this technique, compared to some other laser imaging techniques (e.g. LIF/Mie droplet sizing), is that no fluorescent dye is required. This makes the technique suitable for the characterization of sprays under evaporating conditions. However, its application to optically dense sprays has posed significant challenges and restrictions due to the presence and detection of multiple light scattering.
A novel approach, presented in this talk, consists in combining the polarization ratio approach with Structured Laser Illumination Planar Imaging - SLIPI - a technique that allows suppressing efficiently the unwanted multiple light scattering intensity. Thanks to this suppression of unwanted light, the method offers a promising solution for accurate and comprehensive 2D characterization of challenging atomizing sprays. Note that the SLIPI-polarization ratio technique is calibrated using Phase Doppler Anemometry and applied, here, to a hollow-cone water spray running from 20 and 100 bar injection pressure.
Summarized Bio:
Working positions:
2019 - now: Associate Professor at the Department of Physics, Division of Combustion Physics, Lund University - Sweden. 2015 - 2019: Associate Senior University Lecturer. 2011 - 2015: Assistant Professor. 2007 - 2011: Post-doctoral fellowship.
2014 - now: Guest Professor at Erlangen Graduate School in Advanced Optical Technologies (SAOT), University of Erlangen-Nuremberg - Germany.
2002 - 2006: Ph.D. in Engineering Physics, titled: “Multiple scattering of Light in Optical Diagnostics of Dense Sprays and other Complex Turbid Media” School of Engineering, Cranfield University - England.
Research activities: Author of over 85 peer-reviewed scientific articles published in peer-reviewed journals; 50 peer-reviewed proceedings from international conferences and 7 international patents. Selected as Committee Member of the ILASS-Europe (2023-2025) - Institute of Liquid Atomization & Spray System (https://ilasseurope.org/committee/). Selected as Advisory Committee Member of the “International Symposium on Applications of Laser and Imaging Techniques to Fluid Mechanics”. Biennial conference in Lisbon. (https://lisbon-lasersymposium.org/LXLASER2024/committees/advisory-committee).
Innovation of new instruments: 2020 - Main founder of the start-up company Spec-Imaging AB (https://www.spec-imaging.com/). 2019 - Co-developer of the on-line software “Multi-Scattering” for GPU-based Monte Carlo simulation of light propagation through scattering media (https://multi-scattering.com/). 2017 - Co-developer of the FRAME instrument for simultaneous recording of multiple images on a single camera sensor. Commercialized by the company LaVision GmbH. 2008 - Co-inventor of the SLIPI instrument for removing blurring effects in laser sheet imaging. Commercialized by the company LaVision GmbH.