Application of Laser Techniques for Combustion Studies
Author
Summary, in English
The aim for this work has been to increase the applicability of
laser spectroscopy techniques for studies of combustion processes,
both what regards in-flame experiments, exhaust-gas analysis
and remote sensing of the atmosphere.
Raman spectroscopy has been used for analysis of exhaust gases
from flames, model fires of wood and for inflame measurements.
Coherent anti-Stokes Raman Spectroscopy CARS, has been used for
detection of several flame constituents e.g. o2 , CO, H2o,
CH4 and H2 . Flame temperatures are measured using CARS
spectra from N2 molecules. The CARS technique has also been
used for simultaneous detection of several species e.g. N2/CO,
co2;o2 and CO/H2 . The applications of broadband rotational
CARS have also been demonstrated in non-flame gases, whereas
scanning rotational CARS has been used for flame experiments.
Laser-induced fluorescence LIF is especially attractive for
radical detection, and LIF spectra for several flame radicals are
presented, e.g. OH, CN, CH and c2 as well as relative
concentration profiles for different radicals as a function of
height above the burner.
Special emphasis has been paid to space-resolved detection of
radicals in flames, e.g. OH using a diode array detector. In a
refined experiment, both c2 and OH were spatially detected
using two laser systems.
Two-photon excitation is a rather new and fascinating approach
for detection of flame species that absorb in spectral regions
not accessible for laser sources. In this way oxygen atoms have
been detected in an acetylene/oxygen flame.
Closely connected to combustion studies using laser methods is
remote sensing of pollutants in the atmosphere using laser
7
techniques. These techniques have been used for laboratory
experiments and in real-world measurements. E.g., NO has been
detected using long-path absorption, whereas remote detection of
Hg atoms has been performed using the dial technique.
laser spectroscopy techniques for studies of combustion processes,
both what regards in-flame experiments, exhaust-gas analysis
and remote sensing of the atmosphere.
Raman spectroscopy has been used for analysis of exhaust gases
from flames, model fires of wood and for inflame measurements.
Coherent anti-Stokes Raman Spectroscopy CARS, has been used for
detection of several flame constituents e.g. o2 , CO, H2o,
CH4 and H2 . Flame temperatures are measured using CARS
spectra from N2 molecules. The CARS technique has also been
used for simultaneous detection of several species e.g. N2/CO,
co2;o2 and CO/H2 . The applications of broadband rotational
CARS have also been demonstrated in non-flame gases, whereas
scanning rotational CARS has been used for flame experiments.
Laser-induced fluorescence LIF is especially attractive for
radical detection, and LIF spectra for several flame radicals are
presented, e.g. OH, CN, CH and c2 as well as relative
concentration profiles for different radicals as a function of
height above the burner.
Special emphasis has been paid to space-resolved detection of
radicals in flames, e.g. OH using a diode array detector. In a
refined experiment, both c2 and OH were spatially detected
using two laser systems.
Two-photon excitation is a rather new and fascinating approach
for detection of flame species that absorb in spectral regions
not accessible for laser sources. In this way oxygen atoms have
been detected in an acetylene/oxygen flame.
Closely connected to combustion studies using laser methods is
remote sensing of pollutants in the atmosphere using laser
7
techniques. These techniques have been used for laboratory
experiments and in real-world measurements. E.g., NO has been
detected using long-path absorption, whereas remote detection of
Hg atoms has been performed using the dial technique.
Department/s
Publishing year
1983
Language
English
Publication/Series
Lund Reports in Atomic Physics
Volume
LRAP-22
Full text
- Available as PDF - 68 MB
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Document type
Dissertation
Topic
- Atom and Molecular Physics and Optics
Keywords
- Keywords: Laser-induced fluorescence
- Raman Spectroscopy
- Coherent anti-Stokes Raman Scattering (CARS)
- flames
- laserspectroscopy
- dye laser
- lidar
- remote sensing
- combustion
- air pollution
- radicals
- optical multichannel analyzer.
- Fysicumarkivet A:1983:Aldén
Status
Published
Supervisor
ISBN/ISSN/Other
- ISSN: 0281-2762
Defence date
1 January 1983
Defence time
01:01
Defence place
n/a
Opponent
- [unknown unknown]