Application of Laser Techniques for Combustion Studies

Research output: ThesisDoctoral Thesis (compilation)

Abstract

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
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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.

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • 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.
Original languageEnglish
QualificationDoctor
Awarding Institution
Supervisors/Assistant supervisor
Award date1983 Jan 1
Publication statusPublished - 1983
Publication categoryResearch

Bibliographic note

Defence details Date: 1983-01-01 Time: 01:01 Place: n/a External reviewer(s) Name: [unknown], [unknown] Title: [unknown] Affiliation: [unknown] --- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Atomic physics (011013005), Physics, Faculty of Technology (011013200)