In this work we present a novel analysis of nonlinear filtering. Nonlinear optics are widely applied to different approaches nowadays. In this work, we present a variation of nonlinear filters applied to a spectrometer installed in the Refinery of Salamanca, Guanajuato where we have been producing low sulfur fuels as gasoline and diesel. The study and application of some filters to the fluorescence phenomena and the application to our spectrometer to produce 15 parts per million of sulfur in fuels will be presented.
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