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Three-dimensional measurement of the local extinction coefficient in a dense spray

Wellander, Rikard LU ; Berrocal, Edouard LU ; Kristensson, Elias LU ; Richter, Mattias LU and Aldén, Marcus LU (2011) In Measurement Science & Technology 22(12).
Abstract
Laser extinction, signal attenuation and multiple scattering are the three main phenomena limiting qualitative and quantitative measurements in planar laser imaging of sprays. In this paper, a method is presented where structured laser illumination planar imaging is used to remove the signal contribution from multiply scattered light. Based on this technique, data from side scattering and transmission measurements are obtained simultaneously. An algorithm, compensating for signal attenuation and laser extinction, is further applied to calculate the local extinction coefficient. The method is first demonstrated on a cuvette containing a homogeneous solution of scattering particles with an extinction coefficient (mu) over bar (e) = 0.13... (More)
Laser extinction, signal attenuation and multiple scattering are the three main phenomena limiting qualitative and quantitative measurements in planar laser imaging of sprays. In this paper, a method is presented where structured laser illumination planar imaging is used to remove the signal contribution from multiply scattered light. Based on this technique, data from side scattering and transmission measurements are obtained simultaneously. An algorithm, compensating for signal attenuation and laser extinction, is further applied to calculate the local extinction coefficient. The method is first demonstrated on a cuvette containing a homogeneous solution of scattering particles with an extinction coefficient (mu) over bar (e) = 0.13 mm(-1). Finally the procedure is applied on an air-assisted water spray with a maximum optical depth of OD similar to 3, where the position-dependent extinction coefficient is extracted within the probed volume. To the best of our knowledge, this paper demonstrates for the first time a method to measure the local (mu) over bar (e) within the three dimensions of an inhomogeneous scattering medium using laser sheet illumination, after suppression of the multiple light scattering intensity. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
multiple scattering, laser extinction, signal attenuation, extinction, coefficient, dense sprays, Mie scattering, structured illumination
in
Measurement Science & Technology
volume
22
issue
12
publisher
IOP Publishing
external identifiers
  • wos:000298148200025
  • scopus:81555220981
ISSN
0957-0233
DOI
10.1088/0957-0233/22/12/125303
language
English
LU publication?
yes
id
9426e644-b3eb-4652-acf8-22cd2c625040 (old id 2333232)
date added to LUP
2012-02-06 13:44:58
date last changed
2017-09-10 04:10:24
@article{9426e644-b3eb-4652-acf8-22cd2c625040,
  abstract     = {Laser extinction, signal attenuation and multiple scattering are the three main phenomena limiting qualitative and quantitative measurements in planar laser imaging of sprays. In this paper, a method is presented where structured laser illumination planar imaging is used to remove the signal contribution from multiply scattered light. Based on this technique, data from side scattering and transmission measurements are obtained simultaneously. An algorithm, compensating for signal attenuation and laser extinction, is further applied to calculate the local extinction coefficient. The method is first demonstrated on a cuvette containing a homogeneous solution of scattering particles with an extinction coefficient (mu) over bar (e) = 0.13 mm(-1). Finally the procedure is applied on an air-assisted water spray with a maximum optical depth of OD similar to 3, where the position-dependent extinction coefficient is extracted within the probed volume. To the best of our knowledge, this paper demonstrates for the first time a method to measure the local (mu) over bar (e) within the three dimensions of an inhomogeneous scattering medium using laser sheet illumination, after suppression of the multiple light scattering intensity.},
  articleno    = {125303},
  author       = {Wellander, Rikard and Berrocal, Edouard and Kristensson, Elias and Richter, Mattias and Aldén, Marcus},
  issn         = {0957-0233},
  keyword      = {multiple scattering,laser extinction,signal attenuation,extinction,coefficient,dense sprays,Mie scattering,structured illumination},
  language     = {eng},
  number       = {12},
  publisher    = {IOP Publishing},
  series       = {Measurement Science & Technology},
  title        = {Three-dimensional measurement of the local extinction coefficient in a dense spray},
  url          = {http://dx.doi.org/10.1088/0957-0233/22/12/125303},
  volume       = {22},
  year         = {2011},
}