, Volume 26, Issue 5, pp 402-426

Spectroscopic Detection of Sulfur Oxides in the Aircraft Wake

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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).