Indirect method for determining oxygenate content using near-infrared absorption spectra
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United States of America Patent
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Nov 8, 1994
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app pub date -
May 10, 1993
filing date -
May 27, 1992
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Abstract
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.
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