کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5429205 | 1508701 | 2013 | 8 صفحه PDF | دانلود رایگان |
Optical emission spectra of rich HMDSO/propane/air and propane/air flames (equivalence ratio Φ=1.33) were recorded using an imaging spectrometer in combination with an intensified CCD camera. The probe area was about 1Ã0.2 mm2. This is small for the OES signal and allows scans of high spectral and spatial resolution across the flame.Emission lines of Siâ (â¼252 nm) and SiOâ (220-265 nm) were registered at different heights above the slit burner. Siâ and SiOâ were found up to 10 and 40 mm above the burner, respectively. Up to a HMDSO concentration of 0.015% in the total gas flow a linear dependence between Siâ and HMDSO concentration could be proved. Gas temperatures were determined using Raman scattering by N2 molecules and compared with temperatures derived from simulations of CHâ (A-X) and OHâ (A-X) spectra. N2 and CHâ temperatures are within (1950±50) K and (2400±500) K in a good agreement, respectively. At a height of 12 mm above the burner the OHâ (A-X) molecules have a temperature of (6700±500) K. We suggest to position substrates for coating applications in a distance of 8 to 10 mm from the burner to use the high OHâ concentration for SiO2 layer deposition.
⺠We analyzed a SiO2 nanoparticle forming propane/air flame using OES spectroscopy. ⺠The experimental set-up was optimized to get a spatial resolution of 1 mm2. ⺠We present horizontal scans of Siâ, SiOâ, OHâ, and CHâ at different heights through the flame. ⺠We measured gas temperatures based on N2 Raman scattering as well as OES spectra. ⺠OHâ temperatures of up to 7000 K were found (N2 Raman scattering: 1950 K).
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 114, January 2013, Pages 101-108