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Thermometry using OH laser-induced fluorescence excitation spectra: A feasibility study

Malmqvist, Elin LU (2013) PHYM01 20131
Atomic Physics
Mathematical Physics
Abstract
In this thesis, rotational spectra, acquired through laser-induced fluorescence (LIF) on the OH-radical, were used to evaluate temperatures in different combustion environments. By comparing experimental spectra with theoretical ones of known temperature, the temperature can be determined. A MATLAB-code has been developed that evaluates temperature by comparing experimental spectra with a library of theoretical spectra, using a least-square algorithm. The theoretical spectra database was generated with the software LIFBASE. The code was used to evaluate temperature from OH-spectra acquired from already existing excitation scans recorded in an HCCI-engine, using photofragmentation LIF (PF-LIF). The LIF-signal was detected with ICCD-cameras.... (More)
In this thesis, rotational spectra, acquired through laser-induced fluorescence (LIF) on the OH-radical, were used to evaluate temperatures in different combustion environments. By comparing experimental spectra with theoretical ones of known temperature, the temperature can be determined. A MATLAB-code has been developed that evaluates temperature by comparing experimental spectra with a library of theoretical spectra, using a least-square algorithm. The theoretical spectra database was generated with the software LIFBASE. The code was used to evaluate temperature from OH-spectra acquired from already existing excitation scans recorded in an HCCI-engine, using photofragmentation LIF (PF-LIF). The LIF-signal was detected with ICCD-cameras. The measurements are thus spatially resolved in two dimensions. This spatial resolution was utilized to get spatially resolved, quantitative temperature measurements. Some reference excitation scans were performed during this project using both LIF and PF-LIF. These were acquired in premixed, laminar flames and in a free flow of hydrogen peroxide-vapor at ambient conditons. (Less)
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author
Malmqvist, Elin LU
supervisor
organization
course
PHYM01 20131
year
type
H2 - Master's Degree (Two Years)
subject
keywords
laser-induced fluorescence, LIF, temperature, temperature measurements, OH
language
English
id
3858131
date added to LUP
2013-10-31 14:32:33
date last changed
2015-12-14 13:32:32
@misc{3858131,
  abstract     = {In this thesis, rotational spectra, acquired through laser-induced fluorescence (LIF) on the OH-radical, were used to evaluate temperatures in different combustion environments. By comparing experimental spectra with theoretical ones of known temperature, the temperature can be determined. A MATLAB-code has been developed that evaluates temperature by comparing experimental spectra with a library of theoretical spectra, using a least-square algorithm. The theoretical spectra database was generated with the software LIFBASE. The code was used to evaluate temperature from OH-spectra acquired from already existing excitation scans recorded in an HCCI-engine, using photofragmentation LIF (PF-LIF). The LIF-signal was detected with ICCD-cameras. The measurements are thus spatially resolved in two dimensions. This spatial resolution was utilized to get spatially resolved, quantitative temperature measurements. Some reference excitation scans were performed during this project using both LIF and PF-LIF. These were acquired in premixed, laminar flames and in a free flow of hydrogen peroxide-vapor at ambient conditons.},
  author       = {Malmqvist, Elin},
  keyword      = {laser-induced fluorescence,LIF,temperature,temperature measurements,OH},
  language     = {eng},
  note         = {Student Paper},
  title        = {Thermometry using OH laser-induced fluorescence excitation spectra: A feasibility study},
  year         = {2013},
}