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Two-photon fluorescence laser sheet imaging for high contrast visualization of atomizing sprays

Berrocal, Edouard LU ; Conrad, Chris ; Püls, Jeremias LU ; Arnold, Cord L. LU ; Wensing, Michael ; Linne, Mark LU and Miranda, Miguel LU (2019) In OSA Continuum 2(3). p.983-993
Abstract
Two-photon excitation laser induced fluorescence (2p-LIF) is used here for imaging an optically dense atomizing spray. The main advantage of the approach is that very little fluorescence interference originating from multiple light scattering is generated. This leads to high image contrast and a faithful description of the imaged fluid structures. While point measurement 2p-LIF imaging is a well-known approach used in life science microscopy, it has, to the best of the authors' knowledge, never been tested for analyzing liquid structures in spray systems. We take advantage of this process, here, at a macroscopic scale (textblackslashsim 5textblackslashtimes 5$5texttimes5 mm field of view) by imaging the central part of a light sheet of 10... (More)
Two-photon excitation laser induced fluorescence (2p-LIF) is used here for imaging an optically dense atomizing spray. The main advantage of the approach is that very little fluorescence interference originating from multiple light scattering is generated. This leads to high image contrast and a faithful description of the imaged fluid structures. While point measurement 2p-LIF imaging is a well-known approach used in life science microscopy, it has, to the best of the authors' knowledge, never been tested for analyzing liquid structures in spray systems. We take advantage of this process, here, at a macroscopic scale (textblackslashsim 5textblackslashtimes 5$5texttimes5 mm field of view) by imaging the central part of a light sheet of 10 mm height. To generate enough 2p-LIF signal at such a scale and with single-shot detection, ultra-short laser pulses of 25 fs, centered at 800 nm wavelength and having 2.5 mJ pulse energy, have been used. The technique is demonstrated by imaging a single spray plume from a 6 hole commercial Gasoline Direct Injection (GDI) system running at 200 bar injection pressure. The proposed approach is very promising for detailed analysis of liquid breakups in optically dense sprays and can be used for other fluid mechanics related applications. (Less)
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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Elastic scattering, Imaging techniques, Laser induced fluorescence, Laser scattering, Multiple scattering, X ray imaging
in
OSA Continuum
volume
2
issue
3
pages
11 pages
publisher
Optical Society of America
external identifiers
  • scopus:85069187719
ISSN
2578-7519
DOI
10.1364/OSAC.2.000983
language
English
LU publication?
yes
id
c84e5e6d-96b5-42df-a157-55e267f25ad3
date added to LUP
2019-05-17 17:41:06
date last changed
2022-04-18 05:15:25
@article{c84e5e6d-96b5-42df-a157-55e267f25ad3,
  abstract     = {{Two-photon excitation laser induced fluorescence (2p-LIF) is used here for imaging an optically dense atomizing spray. The main advantage of the approach is that very little fluorescence interference originating from multiple light scattering is generated. This leads to high image contrast and a faithful description of the imaged fluid structures. While point measurement 2p-LIF imaging is a well-known approach used in life science microscopy, it has, to the best of the authors' knowledge, never been tested for analyzing liquid structures in spray systems. We take advantage of this process, here, at a macroscopic scale (textblackslashsim 5textblackslashtimes 5$5texttimes5 mm field of view) by imaging the central part of a light sheet of 10 mm height. To generate enough 2p-LIF signal at such a scale and with single-shot detection, ultra-short laser pulses of 25 fs, centered at 800 nm wavelength and having 2.5 mJ pulse energy, have been used. The technique is demonstrated by imaging a single spray plume from a 6 hole commercial Gasoline Direct Injection (GDI) system running at 200 bar injection pressure. The proposed approach is very promising for detailed analysis of liquid breakups in optically dense sprays and can be used for other fluid mechanics related applications.}},
  author       = {{Berrocal, Edouard and Conrad, Chris and Püls, Jeremias and Arnold, Cord L. and Wensing, Michael and Linne, Mark and Miranda, Miguel}},
  issn         = {{2578-7519}},
  keywords     = {{Elastic scattering; Imaging techniques; Laser induced fluorescence; Laser scattering; Multiple scattering; X ray imaging}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{3}},
  pages        = {{983--993}},
  publisher    = {{Optical Society of America}},
  series       = {{OSA Continuum}},
  title        = {{Two-photon fluorescence laser sheet imaging for high contrast visualization of atomizing sprays}},
  url          = {{https://lup.lub.lu.se/search/files/85448415/osac_2_3_983.pdf}},
  doi          = {{10.1364/OSAC.2.000983}},
  volume       = {{2}},
  year         = {{2019}},
}