Measuring and testing – Gas analysis – With compensation detail
Patent
1997-04-30
1998-11-03
Brock, Michael
Measuring and testing
Gas analysis
With compensation detail
G01N 700
Patent
active
058311459
ABSTRACT:
A method of introducing selectivity to a non-selective gas sensor for determining an amount of a gas of interest contained in a measurement gas wherein the non-selective gas sensor responds not only to the gas of interest but also to other interfering gases contained in the measurement gas, the method includes the steps of periodically modulating a specified flux of a measurement gas at a first predetermined frequency, periodically modulating a specified flux of a gas of interest at a second predetermined frequency, adding the modulated flux of the gas of interest to the modulated flux of the measurement gas, exposing a non-selective gas sensor to the combination of the modulated flux of the measurement gas and the modulated flux of the gas of interest, measuring a sensor output of the non-selective gas sensor at zero frequency (DC) and at specified frequencies (AC), and determining an original concentration of the gas of interest in the measurement gas from the measured sensor output at zero frequency and at the specified frequencies.
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Hurley Michael D.
Logothetis Eleftherios M.
Soltis Richard E.
Brock Michael
Ford Global Technologies Inc.
May, Esq. Roger L.
Melotik Esq. Lorraine S.
Politzer Jay L.
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