Abstract
In order to develop techniques of combustion-gas analysis in situ, we have studied quantitative relations between infrared spectral transmittances of combustion gases and concentrations of the respective infrared-absorbing species. We found that for CO2 at 4.40 μ the statistical band model can be used to establish quantitative relationships for use in gas analysis. We determined the necessary statistical model parameters from 600° to 2400°K, and developed a procedure for using the statistical model to measure concentrations. The method was tested by determining CO2 concentrations in situ in shock-heated gases, with good results.
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