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Evaluation of optical arrangements for ballistic imaging in sprays

Mattias Rahm (Institutionen för tillämpad mekanik, Förbränning) ; David Sedarsky (Institutionen för tillämpad mekanik, Förbränning) ; Megan Paciaroni ; Zhenkan Wang ; Mark Linne (Institutionen för tillämpad mekanik, Förbränning)
Optics Express (1094-4087). Vol. 23 (2015), 17, p. 22444-22462.
[Artikel, refereegranskad vetenskaplig]

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.



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Denna post skapades 2015-08-18. Senast ändrad 2015-11-11.
CPL Pubid: 220762

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Förbränning

Ämnesområden

Transport
Hållbar utveckling
Optik
Mekanisk energiteknik

Chalmers infrastruktur

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