Indirect method for determining oxygenate content using near-inf

Details Indirect method for determining oxygenate content using near-inf Indirect method for determining oxygenate content using near-inf

1993-05-10

1994-11-08

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250343, G01N 2135

Patent

active

053629655

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.

REFERENCES:
"Detection of Methanol in Gasolines Using Near-Infrared Spectroscopy & an Optical Fiber", Applied Spectroscopy, vol. 41, No. 8, 1987, pp. 1388-1392.
"Detection of Ethanol in Wines Using Optical-Fiber Measurements & Near-Infrared Analysis", Applied Spectroscopy, vol. 42, No. 6, 1988, pp. 1106-1111.
"Determination of Carbon-Hydrogen Groups in High Molecular Weight Hydrocarbons", A. Evans, R. R. Hibbard and A. S. Powell Analytical Chemistry, vol. 23, No. 11, Nov. 1951, pp. 1604-1610.

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