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Two-phase SLIPI for instantaneous LIF and Mie imaging of transient fuel sprays

Storch, Michael; Mishra, Yogeshwar Nath LU ; Koegl, Matthias; Kristensson, Elias LU ; Will, Stefan ; Berrocal, Edouard LU and Zigan, Lars (2016) In Optics Letters 41(23). p.5422-5425
Abstract
We report in this Letter a two-phase structured laser illumination planar imaging [two-pulse SLIPI (2p-SLIPI)] optical setup where the "lines structure" is spatially shifted by exploiting the birefringence property of a calcite crystal. By using this optical component and two cross-polarized laser pulses, the shift of the modulated pattern is not "time-limited" anymore. Consequently, two sub-images with spatially mismatched phases can be recorded within a few hundred of nanoseconds only, freezing the motion of the illuminated transient flow. In comparison with previous setups for instantaneous imaging based on structured illumination, the current optical design presents the advantage of having a single optical path, greatly simplifying its... (More)
We report in this Letter a two-phase structured laser illumination planar imaging [two-pulse SLIPI (2p-SLIPI)] optical setup where the "lines structure" is spatially shifted by exploiting the birefringence property of a calcite crystal. By using this optical component and two cross-polarized laser pulses, the shift of the modulated pattern is not "time-limited" anymore. Consequently, two sub-images with spatially mismatched phases can be recorded within a few hundred of nanoseconds only, freezing the motion of the illuminated transient flow. In comparison with previous setups for instantaneous imaging based on structured illumination, the current optical design presents the advantage of having a single optical path, greatly simplifying its complexity. Due to its virtue of suppressing the effects from multiple light scattering, the 2p-SLIPI technique is applied here in an optically dense multi-jet direct-injection spark-ignition (DISI) ethanol spray. The fast formation of polydispersed droplets and appearance of voids after fuel injection are investigated by simultaneous detection of Mie scattering and liquid laser-induced fluorescence. The results allow for significantly improved analysis of the spray structure. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Letters
volume
41
issue
23
pages
4 pages
publisher
Optical Society of America
external identifiers
  • scopus:85005950527
  • wos:000389654000002
ISSN
1539-4794
DOI
10.1364/OL.41.005422
language
English
LU publication?
yes
id
47aca7db-096c-4f03-8574-28cb4579904c
date added to LUP
2016-11-16 17:21:49
date last changed
2017-09-18 11:30:35
@article{47aca7db-096c-4f03-8574-28cb4579904c,
  abstract     = {We report in this Letter a two-phase structured laser illumination planar imaging [two-pulse SLIPI (2p-SLIPI)] optical setup where the "lines structure" is spatially shifted by exploiting the birefringence property of a calcite crystal. By using this optical component and two cross-polarized laser pulses, the shift of the modulated pattern is not "time-limited" anymore. Consequently, two sub-images with spatially mismatched phases can be recorded within a few hundred of nanoseconds only, freezing the motion of the illuminated transient flow. In comparison with previous setups for instantaneous imaging based on structured illumination, the current optical design presents the advantage of having a single optical path, greatly simplifying its complexity. Due to its virtue of suppressing the effects from multiple light scattering, the 2p-SLIPI technique is applied here in an optically dense multi-jet direct-injection spark-ignition (DISI) ethanol spray. The fast formation of polydispersed droplets and appearance of voids after fuel injection are investigated by simultaneous detection of Mie scattering and liquid laser-induced fluorescence. The results allow for significantly improved analysis of the spray structure.},
  author       = {Storch, Michael and Mishra, Yogeshwar Nath  and Koegl, Matthias and Kristensson, Elias and Will, Stefan  and Berrocal, Edouard and Zigan, Lars},
  issn         = {1539-4794},
  language     = {eng},
  month        = {11},
  number       = {23},
  pages        = {5422--5425},
  publisher    = {Optical Society of America},
  series       = {Optics Letters},
  title        = {Two-phase SLIPI for instantaneous LIF and Mie imaging of transient fuel sprays},
  url          = {http://dx.doi.org/10.1364/OL.41.005422},
  volume       = {41},
  year         = {2016},
}