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Measurement of temperature and concentration of OH in a laminar flat flame using the Direct Absorption and the Laser Induced Fluorescence method

Nieuwenhuis, Marjo (2019) Measurement of temperature and concentration of OH in a laminar flat flame using the Direct Absorption and the Laser Induced Fluorescence method. Bachelor's Thesis, Physics.

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Abstract

An experimental study has been carried out to measure the concentration of OH molecules using the direct absorption and the laser induced fluorescence method. Rotational transitions of OH in the A2Σ+ - X2Π(0,0) system have been examined in a premixed CH4/air flame above a McKenna burner. By applying the direct absorption method, the absorption coefficient has been determined by measuring the transmitted intensity of the laser beam sent through the flame by a photodiode. The best result has been obtained by dual path spectroscopy. From the absorption spectra a Boltzmann plot was made and from this plot, the temperature and mole fraction have been derived, which were in agreement with theory. The second method applied for finding the temperature and concentration made use of a photomultiplier to measure the intensity of fluorescence radiation. The excitation spectra obtained showed large discrepancy in intensity of the transitions with the LIFBASE. In future research, improvements in the model and setup should be made. With help of a calibration procedure, the concentration of OH can be found.

Item Type: Thesis (Bachelor's Thesis)
Supervisor:
Supervisor nameSupervisor E mail
Mokhov, A.V.A.V.Mokhov@rug.nl
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 03 Jul 2019
Last Modified: 03 Jul 2019 12:14
URI: http://fse.studenttheses.ub.rug.nl/id/eprint/19829

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