Influence of thermodynamic parameters on the spectral characteristics of heated carbon and nitrogen oxides

Olga K. Voitsekhovskaya; Alexander Yu. Zaprjagaev; Igor V. Golub

doi:10.1117/12.675805

21 April 2006 Influence of thermodynamic parameters on the spectral characteristics of heated carbon and nitrogen oxides

Olga K. Voitsekhovskaya, Alexander Yu. Zaprjagaev, Igor V. Golub

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Proceedings Volume 6160, Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics; 616021 (2006) https://doi.org/10.1117/12.675805
Event: Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 2005, Tomsk, Russian Federation

Abstract

Passive methods of remote analysis of gases of industrial enterprises and aircraft engines and gases ejected in eruptions of volcanoes, in fires, and in other processes disturbing the atmosphere are now of limited utility because of the lack of well-developed mathematical techniques for solving the inverse problems of gas analysis. The current status of research does not offer reliable tools for finding spatial distributions of thermodynamic parameters of a gas medium from passive remote measurements. Possible significant concentrations and temperatures, typical, for example, of forest fire, lead to an optically dense medium for which exponential relations, such as the Bouguer law, are not informative. This calls for the the new ways for processing optical measurements, some of them are suggested in the paper. The current status of research does not offer reliable tools for finding spatial distribution of thermodynamic parameters of the gas medium from remote measurements. At the same time the direct task to determine the spectral gas characteristics requires additional development too. In the given paper the consideration for gaseous carbon and nitrogen oxides and analysis of an error arising at application of homogeneous layer approximation to gas volume with essential gradients of temperatures and concentration will be carried out. The account of transmissivity and emissivity of gases was made in the spectral region of the fundamental bands from 1400 up to 24OOcm^-1 for temperatures 300-3000K. The most effective possibility to analyze the reliability of calculated spectral line parameter databases fully is the Planck-mean absorption coefficient and the comparison with the other authors calculation results was fulfilled.

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Olga K. Voitsekhovskaya, Alexander Yu. Zaprjagaev, and Igor V. Golub "Influence of thermodynamic parameters on the spectral characteristics of heated carbon and nitrogen oxides", Proc. SPIE 6160, Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 616021 (21 April 2006); https://doi.org/10.1117/12.675805

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KEYWORDS

Absorption

Carbon monoxide

Temperature metrology

Databases

Thermodynamics

Oxides

Spectroscopy

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