Spectroscopic Detection of Sulfur Oxides in the Aircraft Wake |
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Authors: | O G Buzykin S V Ivanov A A Ionin A A Kotkov A Yu Kozlov |
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Institution: | (1) Central Aerohydrodynamic Institute, Zhukovsky-3, Moscow Region, 140160, Russia;(2) Institute on Laser Information Technologies, Russian Academy of Sciences, Pionerskaya 2, Troitsk, Moscow Region, 142190, Russia;(3) P. N. Lebedev Physical Institute, Russian Academy of Sciences, Leninskii Pr. 53, Moscow, 119991, Russia |
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Abstract: | The absorption/emission spectral regions of SO, SO2, SO3, S2O and HSO are analyzed for the range from UV (λ ≥ 0.2 μm) to IR (λ < 30 μm) and are compared with the atmospheric transmission
spectrum. It is shown that many vibrational bands of the compounds considered fall into atmospheric transmission windows.
For the vibrational bands of SO, SO2, SO3, S2O, and HSO molecules there are some gases which hinder the absorption diagnostics of the indicated compounds. These interfering
gases are natural components of atmospheric air as well as specific gases of aircraft engine exhaust. It is found that the
least influence of the interference takes place in the 2400–2700 cm−1 IR region. The spectroscopic techniques used for the detection of aircraft engine exhaust compounds are briefly reviewed,
with much consideration given to SO2. The IR absorption spectra of SO2 and other gases are calculated for the conditions of the aircraft engine nozzle exit. Narrow spectral intervals suitable
for SO2 detection in a hot flow are determined. An analysis is made for the detection capabilities of CO2 lasers (including isotope CO2 lasers) and CO lasers (both fundamental band and first-overtone ones) as applied to SO2 detection in aircraft engine exhaust.
Published in English as Preprint No. 5 of the P. N. Lebedev Physical Institute, Moscow (2004). |
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Keywords: | sulfur oxides spectroscopic detection CO2 laser CO laser aircraft engine exhaust |
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