Substance recognition in the open atmosphere from a single Fourier transform spectroradiometer interferogram

An in-situ technique for identification of substances in the open atmosphere from the analysis of a single Fourier-transform spectroradiometer interferogram is described. A database of spectra of major atmospheric constituents and typical atmospheric paths is compiled to be used for the calculation of an atmospheric path with the following separation of a pollutant spectrum from the experimentally recorded spectrum. The identification of a substance by its spectrum is performed through sorting out substances from the database by the correlation coefficients and a quantitative analysis is performed by minimizing the discrepancy functional between the experimental and database spectra. The technique described is tested in situ.