Enhancements to laser spectroscopy modeling by measurement of hydrocarbon fuel gas compositions

A method for determining target components in a sample gas mixture comprising:

• obtaining measured gas concentration data for each of one or more background gases present in the sample gas mixture from a concentration measurement instrument, the gas concentration measurement instrument configured to measure gas concentrations of the one or more background gases;
• obtaining measured light absorption data of each of one or more gaseous target components from a laser spectroscopy instrument indicative of an amount of absorption of light by the sample gas mixture at a frequency of each of the one or more gaseous target components, the laser spectroscopy instrument configured to measure light absorption of the one or more gaseous target components within the sample gas, each of the one or more gaseous target components having an absorption spectrum at the frequency of light or at a combination of frequencies of frequencies of light;
• applying an iterative mathematical model to the measured light absorption data by iteratively adjusting gas concentration fit coefficients and target component fit coefficients until the measured light absorption data matches the chemometric model;
• wherein the chemometric model employs a broadband offset basis to a final basis set spectrum for the one or more gaseous target components;
• applying a correction function to the iterative mathematical model, wherein input parameters of the correction function are the measured gas concentration data and one or more of the iterated gas concentration fit coefficients and target component fit coefficients from the iterative mathematical model;
• and,
• determining a calculated amount of the one or more target components within the sample gas mixture by applying the fit coefficient to the measured light absorption data and to the measured gas concentration data.