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Development of a temporal filtering technique for suppression of interferences in applied laser-induced fluorescence diagnostics.

Ehn, Andreas LU ; Kaldvee, Billy LU ; Bood, Joakim LU and Aldén, Marcus LU (2009) In Applied Optics 48(12). p.2373-2387
Abstract
A temporal filtering technique, complementary to spectral filtering, has been developed for laser-induced fluorescence measurements. The filter is applicable in cases where the laser-induced interfering signals and the signal of interest have different temporal characteristics. For the interfering-signal discrimination a picosecond laser system along with a fast time-gated intensified CCD camera were used. In order to demonstrate and evaluate the temporal filtering concept two measurement situations were investigated; one where toluene fluorescence was discriminated from interfering luminescence of an aluminum surface, and in the other one Mie scattering signals from a water aerosol were filtered out from acetone fluorescence images. A... (More)
A temporal filtering technique, complementary to spectral filtering, has been developed for laser-induced fluorescence measurements. The filter is applicable in cases where the laser-induced interfering signals and the signal of interest have different temporal characteristics. For the interfering-signal discrimination a picosecond laser system along with a fast time-gated intensified CCD camera were used. In order to demonstrate and evaluate the temporal filtering concept two measurement situations were investigated; one where toluene fluorescence was discriminated from interfering luminescence of an aluminum surface, and in the other one Mie scattering signals from a water aerosol were filtered out from acetone fluorescence images. A mathematical model was developed to simulate and evaluate the temporal filter for a general measurement situation based on pulsed-laser excitation together with time-gated detection. Using system parameters measured with a streak camera, the model was validated for LIF imaging of acetone vapor inside a water aerosol. The results show that the temporal filter is capable of efficient suppression of interfering signal contributions. The photophysical properties of several species commonly studied by LIF in combustion research have been listed and discussed to provide guidelines for optimum use of the technique. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Optics
volume
48
issue
12
pages
2373 - 2387
publisher
OSA
external identifiers
  • wos:000265887200024
  • pmid:19381191
  • scopus:65349098920
ISSN
2155-3165
DOI
10.1364/AO.48.002373
language
English
LU publication?
yes
id
08d98cf3-6406-47f4-903f-74e6d9fd7280 (old id 1391977)
date added to LUP
2009-05-12 09:45:22
date last changed
2017-01-01 05:11:41
@article{08d98cf3-6406-47f4-903f-74e6d9fd7280,
  abstract     = {A temporal filtering technique, complementary to spectral filtering, has been developed for laser-induced fluorescence measurements. The filter is applicable in cases where the laser-induced interfering signals and the signal of interest have different temporal characteristics. For the interfering-signal discrimination a picosecond laser system along with a fast time-gated intensified CCD camera were used. In order to demonstrate and evaluate the temporal filtering concept two measurement situations were investigated; one where toluene fluorescence was discriminated from interfering luminescence of an aluminum surface, and in the other one Mie scattering signals from a water aerosol were filtered out from acetone fluorescence images. A mathematical model was developed to simulate and evaluate the temporal filter for a general measurement situation based on pulsed-laser excitation together with time-gated detection. Using system parameters measured with a streak camera, the model was validated for LIF imaging of acetone vapor inside a water aerosol. The results show that the temporal filter is capable of efficient suppression of interfering signal contributions. The photophysical properties of several species commonly studied by LIF in combustion research have been listed and discussed to provide guidelines for optimum use of the technique.},
  author       = {Ehn, Andreas and Kaldvee, Billy and Bood, Joakim and Aldén, Marcus},
  issn         = {2155-3165},
  language     = {eng},
  number       = {12},
  pages        = {2373--2387},
  publisher    = {OSA},
  series       = {Applied Optics},
  title        = {Development of a temporal filtering technique for suppression of interferences in applied laser-induced fluorescence diagnostics.},
  url          = {http://dx.doi.org/10.1364/AO.48.002373},
  volume       = {48},
  year         = {2009},
}