Application of structured illumination for multiple scattering suppression in planar laser imaging of dense sprays.
(2008) In Optics Express 16(22). p.17870-17881- Abstract
- A novel approach to reduce the multiple light scattering contribution in planar laser images of atomizing sprays is reported. This new technique, named Structured Laser Illumination Planar Imaging (SLIPI), has been demonstrated in the dense region of a hollow-cone water spray generated in ambient air at 50 bars injection pressure. The idea is based on using an incident laser sheet which is spatially modulated along the vertical direction. By properly shifting the spatial phase of the modulation and using post-processing of the successive recorded images, the blurring effects from multiple light scattering can be mitigated. Since hollow-cone sprays have a known inner structure in the central region, the efficiency of the method could be... (More)
- A novel approach to reduce the multiple light scattering contribution in planar laser images of atomizing sprays is reported. This new technique, named Structured Laser Illumination Planar Imaging (SLIPI), has been demonstrated in the dense region of a hollow-cone water spray generated in ambient air at 50 bars injection pressure. The idea is based on using an incident laser sheet which is spatially modulated along the vertical direction. By properly shifting the spatial phase of the modulation and using post-processing of the successive recorded images, the blurring effects from multiple light scattering can be mitigated. Since hollow-cone sprays have a known inner structure in the central region, the efficiency of the method could be evaluated. We demonstrate, for the case of averaged images, that an unwanted contribution of 44% of the detected light intensity can be removed. The suppression of this diffuse light enables an increase from 55% to 80% in image contrast. Such an improvement allows a more accurate description of the near-field region and of the spray interior. The possibility of extracting instantaneous flow motion is also shown, here, for a dilute flow of water droplets. These results indicate promising applications of the technique to denser two-phase flows such as air-blast atomizer and diesel sprays. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1261851
- author
- Berrocal, Edouard LU ; Kristensson, Elias LU ; Richter, Mattias LU ; Linne, Mark LU and Aldén, Marcus LU
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Optics Express
- volume
- 16
- issue
- 22
- pages
- 17870 - 17881
- publisher
- Optical Society of America
- external identifiers
-
- wos:000260865900075
- pmid:18958069
- scopus:55349147352
- ISSN
- 1094-4087
- DOI
- 10.1364/OE.16.017870
- language
- English
- LU publication?
- yes
- id
- 53341071-e378-45e7-b518-a317bdd19365 (old id 1261851)
- date added to LUP
- 2016-04-01 14:09:16
- date last changed
- 2022-03-14 03:56:07
@article{53341071-e378-45e7-b518-a317bdd19365,
abstract = {{A novel approach to reduce the multiple light scattering contribution in planar laser images of atomizing sprays is reported. This new technique, named Structured Laser Illumination Planar Imaging (SLIPI), has been demonstrated in the dense region of a hollow-cone water spray generated in ambient air at 50 bars injection pressure. The idea is based on using an incident laser sheet which is spatially modulated along the vertical direction. By properly shifting the spatial phase of the modulation and using post-processing of the successive recorded images, the blurring effects from multiple light scattering can be mitigated. Since hollow-cone sprays have a known inner structure in the central region, the efficiency of the method could be evaluated. We demonstrate, for the case of averaged images, that an unwanted contribution of 44% of the detected light intensity can be removed. The suppression of this diffuse light enables an increase from 55% to 80% in image contrast. Such an improvement allows a more accurate description of the near-field region and of the spray interior. The possibility of extracting instantaneous flow motion is also shown, here, for a dilute flow of water droplets. These results indicate promising applications of the technique to denser two-phase flows such as air-blast atomizer and diesel sprays.}},
author = {{Berrocal, Edouard and Kristensson, Elias and Richter, Mattias and Linne, Mark and Aldén, Marcus}},
issn = {{1094-4087}},
language = {{eng}},
number = {{22}},
pages = {{17870--17881}},
publisher = {{Optical Society of America}},
series = {{Optics Express}},
title = {{Application of structured illumination for multiple scattering suppression in planar laser imaging of dense sprays.}},
url = {{https://lup.lub.lu.se/search/files/3817658/2342644.pdf}},
doi = {{10.1364/OE.16.017870}},
volume = {{16}},
year = {{2008}},
}