INDIREKTES VERFAHREN ZUR BESTIMMUNG DES INHALTS AN SAUERSTOFFEINHALTENDEN SUBSTANZEN MIT VERWENDUNG VON NAH-INFRAROT ABSORPTIONSSPEKTRON

摘要

Method for determining oxygenate content and/or octane of hydrocarbon fuels suitable for automotive vehicles. Selecting nanometer frequencies in the range 1,300 to 1,350 reduces the temperature dependence of calibration equations that predict values representative of both oxygenate content and octane. This can be further improved by using only derivatives of selected temperature-dependent frequencies in addition to those in the 1,300 to 1,350 nanometer range. The selected frequencies preferably primarily correspond to C-H vibrational modes.