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@PHDTHESIS{Brysch:60054,
author = {Brysch, Adriane Therese},
othercontributors = {Poprawe, Reinhart},
title = {{L}aser-{E}missionsspektrometrie für die {P}artikelanalyse
von {P}rozessgasen bei der {R}oheisenerzeugung},
address = {Aachen},
publisher = {Publikationsserver der RWTH Aachen University},
reportid = {RWTH-CONV-121784},
pages = {128 S. : Ill., graph. Darst.},
year = {2004},
note = {Prüfungsjahr: 2004. - Publikationsjahr: 2005; Aachen,
Techn. Hochsch., Diss., 2004},
abstract = {The industrial use of laser emission spectrometry for
particle analysis in gas at overpressure is a metrological
challenge due to a reduction of analytical sensitivity
caused by a top gas pressure of up to four bar. In the scope
of this work it is shown that an increase of the gas
pressure affects the electron pressure as well as the
electron density due to collison and relaxation processes.
Plasma properties are changed which lead to a decrease of
line intensity, line broadening and to a decrease of
signal-to-backround ratio. Consequently the gas pressure has
an impact on the plasma dynamics and must be considered as a
relevant parameter for the analysis of gas and particles in
gas. Model calculations proof that the observed change of
the emission line profil can by described by
Stark-Effekt-braodening and Stark-Effekt-shift using a
plasma model with core- and shell- specific electron
temperatures. Double pulses with interpulse separation in
the ns region are used to increase the line intensity of the
LIBS spectra and to avoid the impact of overpressure on the
emission line profil, thus leading to an enhanced
signal-to-backround ratio of the spectral emission lines.
Based on the laboratory results a laser set-up for field
tests in steel industry was developed and tested on-site for
muli-element analysis at different European blast furnaces.
Signal-to-background ratio was optimised by double pulse
excitation to allow the analysis of low-concentrated
cirulting elements in top gas covering a few ppm. Line
broadening and spectral shift is in a way reduced which
makes a re-profilation of the laser-based set-up due to
variations in top gas pressure no longer necessary. A
simultaneous and continous on-line monitoring of the
circulating elements Na, K, Zn und Pb was demonstrated
successfully by performing daily measurements at a maximum
duration of up to 10 hours.},
keywords = {Hochofen (SWD) / Gichtstaub (SWD) / Metallteilchen (SWD) /
Laserinduzierte Breakdown-Spektroskopie (SWD) /
Prozessüberwachung (SWD) / Online-Messung (SWD)},
cin = {400000},
ddc = {660},
cid = {$I:(DE-82)400000_20140620$},
typ = {PUB:(DE-HGF)11},
urn = {urn:nbn:de:hbz:82-opus-11715},
doi = {10.18154/RWTH-CONV-121784},
url = {https://publications.rwth-aachen.de/record/60054},
}
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