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Laser Induced Fluorescence Spectroscopy for measuring hydroxyl concentration in flames.

Heusinkveld, Hanneke (2019) Laser Induced Fluorescence Spectroscopy for measuring hydroxyl concentration in flames. Research Project 1, Energy and Environmental Sciences.


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In this research the hydroxyl concentration in methane/air flames was measured by the technique of Laser Induced Fluorescence (LIF). Two approaches can be used to determine the hydroxyl (OH) concentration. First, a fitting program was used to determine the OH concentration from a measured spectrum. The influence of the temperature dependence on the linewidth in this fitting program was tested by generating theoretical spectra at various temperatures and fitting them with a spectrum with linewidth at fixed temperature 2000 K. The difference between the actual temperature or concentration and fitted temperature or concentration was in all cases less than $5\%$. Second, the OH concentration was determined by a calibration procedure, where the fluorescence intensity was measured at different OH concentrations. At a fixed equivalence ratio the calibration curve is approximated by a line. However, the slope changed with different equivalence ratio's. This could be caused by the uncertainty in for example the flow rates. Each calibration line can be used separately for future quantitative LIF measurements.

Item Type: Thesis (Research Project 1)
Supervisor nameSupervisor E mail
Degree programme: Energy and Environmental Sciences
Thesis type: Research Project 1
Language: English
Date Deposited: 11 Jun 2019
Last Modified: 12 Jun 2019 12:21

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