Evaluation of optical arrangements for ballistic imaging in sprays

Research output: Contribution to journalArticle

Abstract

This work investigates the imaging performance, in terms of contrast and resolution, of two different time-gated ballistic imaging setups commonly used in spray research. It is shown that the two setups generate similar spatial resolution in the presence of scattering media. The simpler (2f) setup, however, is less sensitive to component misalignments and time-gate induced aberrations than the commonly used (4f) system. Measurements comparing both arrangements indicated slightly higher contrast for the 2f system under the densest conditions for small scatterers. Subsequent computational modeling confirmed the observed tolerance of the 2f system to misalignment and gate effects. The best performing setup was also compared experimentally to its non-time-gated shadow-imaging equivalent, to establish when the time-gate enhances imaging performance. It is shown that the time-gated setup generates higher contrast under almost all of the scattering conditions tested, while the non-time-gated setup generates higher spatial resolution only in the lower scatterer size range at the lowest scatterer concentrations. (C) 2015 Optical Society of America

Details

Authors
  • Mattias Rahm
  • Megan Paciaroni
  • Zhenkan Wang
  • David Sedarsky
  • Mark Linne
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
Original languageEnglish
Pages (from-to)22444-22462
JournalOptics Express
Volume23
Issue number17
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes

Related research output

Wang, Z., 2018 May 4, Lund University: Division of Combustion Physics, Department of Physics, Lund University. 387 p.

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