Radiation properties of water vapor in IR range for the thermodynamically inhomogeneous optical paths

摘要

The report is devoted to the research of IR spectrum of high temperature (T < 3000 K) and thermodynamic inhomogeneous heat water vapor. The physical models of the description factors of absorption and emissivity within the framework of direct accounts line by line are discussed. The main attention is given to the form of the spectral lines parameters databases of water vapor based on generating information system HOTGAS-H_2O. Assuming that the radiation diffusion and local thermodynamic balance are fulfilled inside a layer, the emissivity calculations for various path conditions of concentration and temperatures 300-3000 K are designed. Thus, stratified environment formed by an user was simulated by layers of various thickness. Approximations of absorption coefficients simplifying considerably calculations are proposed. The estimation of the nonselective absorption of water vapor in the range 8-12 microns for temperatures 1500-3000 K are given for the first time. The work is supported by "Universities of Russia" scientific program (grant N ur. 01.01.393).