Diagnostics of combustion plasmas with highly biased wing intensities

摘要

The applicability of a newly proposed relationship between the optical depth and the atomic absorption coefficient (AAC) to measure the optical cross section and emission atom density of alkali seeded combustion plasmas was examined with numerical models and experimental emission - absorption data. Numerical calculation showed that the depth-AAC relationship could be applied to plasmas with highly biased wing spectral intensities like seeded coal combustion plasmas. If this condition is met, thewing bias level from the Voight or Lorentz profile can be determined simultaneously together with the spectral properties and the density. This conclusion was confirmed with two typical plasma data. One is those of optically thick coal combustion plasmas. The other is those of optically thin plasmas with almost theoretical wing spectra.