ENHANCEMENTS TO LASER SPECTROSCOPY MODELING BY MEASUREMENT OF HYDROCARBON FUEL GAS COMPOSITIONS

The present disclosure relates to measuring chemical constituents and associated properties of hydrocarbon fuel mixtures, and further relates to tunable diode laser absorption spectrometry gas analyzers having improved chemometric models. Methods described herein include setting gas concentration fit coefficients to a chemometric model for the measured gas concentration data for each of one or more background; wherein the chemometric model employs a broadband offset basis to a final basis set spectrum for the one or more gaseous target components; applying an iterative mathematical model to the measured light absorption data by iteratively adjusting target component fit coefficients until the measured light absorption data matches the chemometric model; and, determining a calculated amount of the one or more target components within the sample gas mixture by applying the gas concentration fit coefficients and the target component fit coefficients to the measured light absorption data and to the measured gas concentration data.