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Ballistic Imaging of Transient Phenomena in Turbid Media

Sedarsky, David LU (2009)
Abstract
Ballistic imaging (BI) was developed as an optical diagnostic capable of ascertaining velocity and spatial information within dense sprays with relevance to liquid-fuel injection and combustion. This development includes a full model of light scattering within the complete imaging system, enabling the performance of the instrument to be examined, optimized and quantified. BI is a laser-based measurement for enhanced visualization of strong gradient disturbances within inhomogeneous highly scattering media. The technique is a specialized shadow-imaging method, closely related to schlieren and shadowgraph techniques, which focuses on eliminating stray and multiply-scattered source light from a line-of-sight integrated 2-D signal, detected in... (More)
Ballistic imaging (BI) was developed as an optical diagnostic capable of ascertaining velocity and spatial information within dense sprays with relevance to liquid-fuel injection and combustion. This development includes a full model of light scattering within the complete imaging system, enabling the performance of the instrument to be examined, optimized and quantified. BI is a laser-based measurement for enhanced visualization of strong gradient disturbances within inhomogeneous highly scattering media. The technique is a specialized shadow-imaging method, closely related to schlieren and shadowgraph techniques, which focuses on eliminating stray and multiply-scattered source light from a line-of-sight integrated 2-D signal, detected in a forward-collection geometry. Experimental investigations of two turbulent sprays were conducted, and new spray behavior was observed over the course of both measurement campaigns: Bifurcation in a two-phase flow was observed for the first time, in a jet-in-crossflow, and overall flowrate effects were shown to influence the breakup characteristics in an effervescent spray. Analysis methods were developed to apply spatial correlation to BI results, enabling the determination of velocity vectors throughout a dense spray. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Professor Dunn-Rankin, Derek, University of California, USA
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Mie scattering, Laser Combustion Diagnostics, Imaging, Spray Diagnostics, Turbid Media, Velocity
defense location
Sal A, Fysiska institutionen, Sölvegatan 14 C, Lund.
defense date
2009-11-27 10:15
ISBN
978-91-628-7963-1
language
English
LU publication?
yes
id
1fcfcab2-5970-462a-86cc-be17dd0ea7d6 (old id 1502202)
date added to LUP
2009-11-05 14:22:34
date last changed
2016-09-19 08:45:18
@misc{1fcfcab2-5970-462a-86cc-be17dd0ea7d6,
  abstract     = {Ballistic imaging (BI) was developed as an optical diagnostic capable of ascertaining velocity and spatial information within dense sprays with relevance to liquid-fuel injection and combustion. This development includes a full model of light scattering within the complete imaging system, enabling the performance of the instrument to be examined, optimized and quantified. BI is a laser-based measurement for enhanced visualization of strong gradient disturbances within inhomogeneous highly scattering media. The technique is a specialized shadow-imaging method, closely related to schlieren and shadowgraph techniques, which focuses on eliminating stray and multiply-scattered source light from a line-of-sight integrated 2-D signal, detected in a forward-collection geometry. Experimental investigations of two turbulent sprays were conducted, and new spray behavior was observed over the course of both measurement campaigns: Bifurcation in a two-phase flow was observed for the first time, in a jet-in-crossflow, and overall flowrate effects were shown to influence the breakup characteristics in an effervescent spray. Analysis methods were developed to apply spatial correlation to BI results, enabling the determination of velocity vectors throughout a dense spray.},
  author       = {Sedarsky, David},
  isbn         = {978-91-628-7963-1},
  keyword      = {Mie scattering,Laser Combustion Diagnostics,Imaging,Spray Diagnostics,Turbid Media,Velocity},
  language     = {eng},
  title        = {Ballistic Imaging of Transient Phenomena in Turbid Media},
  year         = {2009},
}