Near-infrared emission spectrometry measurements for nonintrusive soot diagnostics in flames

Ayranci, Isil
Vaillon, Rodolphe
Selçuk, Nevin
The present study focuses on measurement of line-of-sight emission intensity spectra in the near-infrared range by Fourier-transform infrared spectrometry for use in tomographic soot diagnostics. Measurements are carried out on an axisymmetric, laboratory grade, ethylene/air diffusion flame within the 1.1-1.7 mu m (9000-6000 cm(-1)) spectral range. Presentation of the measurement and calibration methodology is followed by the description of noise and uncertainty assessment procedures. A novel noise characterization approach that accounts for both spectral and spatial fluctuations is introduced. Measured intensities are utilized to infer soot temperature and volume fraction profiles from an inversion technique based on gray refractive index assumption. Predictions at flame axis are found to be in reasonable agreement with properties reported in literature for similar flames, but steep volume fraction peaks at the flame edges are not sufficiently captured due to the expected effects of large beam diameter, suggesting that the present configuration requires improvement in terms of spatial resolution.


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Thermophotovoltaic (TPV) devices convert thermal radiation into electricity by using a thermal emitter and a photovoltaic (PV) cell. TPV systems can utilize variety of heat sources, which makes them suitable for harvesting waste heat. The downside of current TPV technology is its low efficiency due to the spectral mismatch between thermal emission of the emitter and the bandgap of the cell. In this thesis, the effect of nanostructures on radiative properties is studied in order to develop efficient TPV emit...
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Determination of soot temperature, volume fraction and refractive index from flame emission spectrometry
Ayranci, Iail; Vaillon, Rodolphe; Selçuk, Nevin; Andre, Frederic; Escudie, Dany (2007-03-01)
An inversion scheme based on tomographic reconstruction of flame emission spectra has been developed for nonintrusive characterization of soot temperature and volume fraction fields within an optically thin axisymmetric flame by extracting characteristic information on soot refractive index from spectral gradients of emission spectra. Its performance is assessed by providing input data obtained from intensities simulated by a direct code based on experimental data for a flame available in the literature. Pr...
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Gokagac, G; Yildirim, LT; Sonsuz, N; Sen, F (2005-05-01)
The [Cu(C6H2Br2ClO)(2)(NH3)(2)] complex was synthesized and characterized by XRD, UV/vis, FTIR, DSC, elemental analysis and magnetic susceptibility measurements. The structural analysis of the title complex indicated that it is a monomeric centrosymmetric compound which crystallizes in the monoclinic system, P2(1)/c, and has a trans-planar CuO2N2 coordination [Cu-O 1.940(5) and Cu-N 1.978(7) angstrom]. In the coordination sphere of the Cu atom, there are long range interactions with Br2 and the centrosymetr...
Citation Formats
I. Ayranci, R. Vaillon, and N. Selçuk, “Near-infrared emission spectrometry measurements for nonintrusive soot diagnostics in flames,” JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, pp. 349–361, 2008, Accessed: 00, 2020. [Online]. Available: