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Light sheet fluorescence microscopic imaging for the primary breakup of diesel and gasoline sprays with real-world fuels

Durst, Alexander ; Wensing, Michael and Berrocal, Edouard LU (2018) In Applied Optics 57(10). p.2704-2714
Abstract

This paper describes the adaptation of the laser-induced fluorescence measurement technique for the investigation of the primary breakup of modern diesel and gasoline direct injection sprays. To investigate the primary breakup, a microscopic technique is required, and with the help of special tracer dyes, a high fluorescence signal can be achieved in the visible range of the electromagnetic spectrum, resulting in good image quality with a nonintensified camera. Besides the optimization of the optical setup for the microscopic field of view, different tracer dyes are compared, and their solubility and fluorescence are tested in the desired surrogate and real-world fuels. As a tracer, the phenoxazine dye Nile Red was found to provide... (More)

This paper describes the adaptation of the laser-induced fluorescence measurement technique for the investigation of the primary breakup of modern diesel and gasoline direct injection sprays. To investigate the primary breakup, a microscopic technique is required, and with the help of special tracer dyes, a high fluorescence signal can be achieved in the visible range of the electromagnetic spectrum, resulting in good image quality with a nonintensified camera. Besides the optimization of the optical setup for the microscopic field of view, different tracer dyes are compared, and their solubility and fluorescence are tested in the desired surrogate and real-world fuels. As a tracer, the phenoxazine dye Nile Red was found to provide sufficient solubility in alkanes as well as suitable emission and excitation spectrum for the use of the second-harmonic frequency of a Nd:YAG laser (532 nm). The good quantum efficiency delivered by Nile Red also meant that single-shot images clearly showing spray structures in regions measuring up to 3 mm by 3 mm around the nozzle outlet could be recorded. Compared to relatively easy shadowgraph techniques and complex and costly x-ray synchrotron measurements, light sheet fluorescence microscopic imaging is not overly complex yet delivers excellent data on spray structures as well as qualitative fuel distribution.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Optics
volume
57
issue
10
pages
11 pages
publisher
Optical Society of America
external identifiers
  • pmid:29714263
  • scopus:85044825838
ISSN
1559-128X
DOI
10.1364/AO.57.002704
language
English
LU publication?
yes
id
ae3be1a7-9319-44e1-8740-e08502ac8240
date added to LUP
2018-04-13 14:08:37
date last changed
2020-05-26 04:43:15
@article{ae3be1a7-9319-44e1-8740-e08502ac8240,
  abstract     = {<p>This paper describes the adaptation of the laser-induced fluorescence measurement technique for the investigation of the primary breakup of modern diesel and gasoline direct injection sprays. To investigate the primary breakup, a microscopic technique is required, and with the help of special tracer dyes, a high fluorescence signal can be achieved in the visible range of the electromagnetic spectrum, resulting in good image quality with a nonintensified camera. Besides the optimization of the optical setup for the microscopic field of view, different tracer dyes are compared, and their solubility and fluorescence are tested in the desired surrogate and real-world fuels. As a tracer, the phenoxazine dye Nile Red was found to provide sufficient solubility in alkanes as well as suitable emission and excitation spectrum for the use of the second-harmonic frequency of a Nd:YAG laser (532 nm). The good quantum efficiency delivered by Nile Red also meant that single-shot images clearly showing spray structures in regions measuring up to 3 mm by 3 mm around the nozzle outlet could be recorded. Compared to relatively easy shadowgraph techniques and complex and costly x-ray synchrotron measurements, light sheet fluorescence microscopic imaging is not overly complex yet delivers excellent data on spray structures as well as qualitative fuel distribution.</p>},
  author       = {Durst, Alexander and Wensing, Michael and Berrocal, Edouard},
  issn         = {1559-128X},
  language     = {eng},
  month        = {04},
  number       = {10},
  pages        = {2704--2714},
  publisher    = {Optical Society of America},
  series       = {Applied Optics},
  title        = {Light sheet fluorescence microscopic imaging for the primary breakup of diesel and gasoline sprays with real-world fuels},
  url          = {http://dx.doi.org/10.1364/AO.57.002704},
  doi          = {10.1364/AO.57.002704},
  volume       = {57},
  year         = {2018},
}