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Multiple Scattering Suppression In Planar Laser Imaging Of Dense Sprays By Means Of Structured Illumination

Berrocal, Edouard LU ; Kristensson, Elias LU ; Richter, Mattias LU ; Linne, Mark and Aldén, Marcus LU (2010) In Atomization and Sprays 20(2). p.133-139
Abstract
A novel method to reduce the multiply scattered light contribution to images recorded with planar laser imaging is demonstrated. The technique, structured laser illumination planar imaging (SLIPI), is based on spatially modulated excitation light and is tested here within the dense region of a hollow-cone spray. The main idea is to use a laser sheet that is spatially modulated along the vertical direction. By both shifting the spatial phase of the modulation and using adequate image post processing of the successive recorded images, it is possible to remove a significant amount of the multiply scattered light detected. In this paper, SLIPI is applied for imaging within a typical hollow-cone water spray generated in ambient air at 50 bars... (More)
A novel method to reduce the multiply scattered light contribution to images recorded with planar laser imaging is demonstrated. The technique, structured laser illumination planar imaging (SLIPI), is based on spatially modulated excitation light and is tested here within the dense region of a hollow-cone spray. The main idea is to use a laser sheet that is spatially modulated along the vertical direction. By both shifting the spatial phase of the modulation and using adequate image post processing of the successive recorded images, it is possible to remove a significant amount of the multiply scattered light detected. In this paper, SLIPI is applied for imaging within a typical hollow-cone water spray generated in ambient air at 50 bars injection pressure from a pressure-swirl nozzle. Because this type of spray has a known inner structure, the method can be evaluated, demonstrating that 47% of the detected light arising from multiple scattering can be suppressed, resulting in an increase from 61% to 89 % in image contrast. Such an improvement allows more accurate interpretation and analysis of the near-field region of atomizing sprays. The possibility of extracting instantaneous flow motion is also demonstrated for the case of a dilute nebulizer. All these results indicate promising applications of the technique in denser turbid media, such as air-blast atomizer or diesel sprays. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
image contrast enhancement, multiple scattering, dense spray imaging
in
Atomization and Sprays
volume
20
issue
2
pages
133 - 139
publisher
Begell House
external identifiers
  • wos:000277195600003
  • scopus:77951139695
ISSN
1936-2684
language
English
LU publication?
yes
id
d2a7b92a-5761-43d3-8233-3eb9fda67804 (old id 1619544)
alternative location
http://www.begellhouse.com/journals/6a7c7e10642258cc,164c389809c39877,2c7285730415e992.html
date added to LUP
2010-06-18 11:26:22
date last changed
2018-05-29 09:51:40
@article{d2a7b92a-5761-43d3-8233-3eb9fda67804,
  abstract     = {A novel method to reduce the multiply scattered light contribution to images recorded with planar laser imaging is demonstrated. The technique, structured laser illumination planar imaging (SLIPI), is based on spatially modulated excitation light and is tested here within the dense region of a hollow-cone spray. The main idea is to use a laser sheet that is spatially modulated along the vertical direction. By both shifting the spatial phase of the modulation and using adequate image post processing of the successive recorded images, it is possible to remove a significant amount of the multiply scattered light detected. In this paper, SLIPI is applied for imaging within a typical hollow-cone water spray generated in ambient air at 50 bars injection pressure from a pressure-swirl nozzle. Because this type of spray has a known inner structure, the method can be evaluated, demonstrating that 47% of the detected light arising from multiple scattering can be suppressed, resulting in an increase from 61% to 89 % in image contrast. Such an improvement allows more accurate interpretation and analysis of the near-field region of atomizing sprays. The possibility of extracting instantaneous flow motion is also demonstrated for the case of a dilute nebulizer. All these results indicate promising applications of the technique in denser turbid media, such as air-blast atomizer or diesel sprays.},
  author       = {Berrocal, Edouard and Kristensson, Elias and Richter, Mattias and Linne, Mark and Aldén, Marcus},
  issn         = {1936-2684},
  keyword      = {image contrast enhancement,multiple scattering,dense spray imaging},
  language     = {eng},
  number       = {2},
  pages        = {133--139},
  publisher    = {Begell House},
  series       = {Atomization and Sprays},
  title        = {Multiple Scattering Suppression In Planar Laser Imaging Of Dense Sprays By Means Of Structured Illumination},
  volume       = {20},
  year         = {2010},
}