Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1989-06-19
1991-02-05
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250339, 250340, G01N 2159
Patent
active
049907808
ABSTRACT:
A method is provided for precisely and concurrently measuring dynamic engine oil consumption and fuel consumption within an internal combustion engine in an automotive environment on a real time basis. Nonradioactive tracer compounds, such as bromine or chlorine in the form of organic bromo- or chloro-compounds are added to the engine oil in small amounts. Upon complete combustion, the bromine or chlorine is converted into either hydrogen bromide or hydrogen chloride. A sample of the exhaust gases generated by the internal combustion engine and comprising the hydrogen bromide or hydrogen chloride is collected and maintained at a pressure where distinction between an absorption line of the tracer specie and the absorption lines of a related isotopic species is discernible. Monochromatic radiation is then transmitted through the gaseous sample at the frequency of an absorption line particular to the tracer specie. Because of the high spectral power density and spectral resolution of the preferred tunable diode lasers, tunable diode laser spectroscopy may be used to measure the amount of tracer isotope within the resultant HCl or HBr gases in the exhaust gases. Corresponding fuel consumption may also be determined from the CO.sub.2 in the exhaust gases by similar methods.
REFERENCES:
G. J. Kemeny, R. S. Eng and A. W. Mantz, "Utilization of Tunable Infrared Diode Lasers for the Determination of Labelled Molecules in Gas Mixtures", Acta Physica Academiae Scientarium Hungaricae, Tomus [Vol.] 48, No. 1 (1980) pp. 93-102.
"The Clinical Spectrum", Scientific American, Dec. issue, variously identified as 1985 or 1987.
Lee Peter S.
Majkowski Richard F.
Schreck Richard M.
General Motors Corporation
Hannaher Constantine
Hartman Domenica N. S.
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