Abstract
We describe an optical technique for quantitative evaluation of the concentrations of coexisting vapour and liquid phases in a spray. A laser-induced exciplex fluorescence visualization system allows time-resolved two-dimensional fluorescence images of vapour and liquid distributions to be acquired simultaneously using two-colour emission. The method is based on the exciplex formers DMA (N,N-dimethylaniline) and 1,4,6-TMN (trimethylnaphthalene) in a non-polar solvent. We report here methods for quantitatively calibrating the liquid and vapour phases of a solution containing 90% isooctane, 5% DMA and 5% 1,4,6-TMN. The evaluation of fluorescence intensities yields quantitative two-dimensional concentration maps of liquid and vapour phases. This technique is expected to find applications in studying mixture formation in diesel or spark ignition engines with spectrally well-separated fluorescence images obtained from the monomer and exciplex constituents dissolved in a fuel.
Published Version
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