The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 20, 1998
Filed:
Apr. 30, 1997
Eleftherios M Logothetis, Birmingham, MI (US);
Michael D Hurley, Ann Arbor, MI (US);
Richard E Soltis, Saline, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
A method for determining an amount of a gas of interest contained in a measurement gas 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 specified gas that can react non-linearly with the gas of interest at a second predetermined frequency, adding the modulated flux of the specified gas to the modulated flux of the measurement gas, passing the mixture of the two modulated gas fluxes through a reactor where the gas of interest reacts with the specified gas to produce a third gas, exposing a gas sensor that can respond to the third gas present in the gas mixture after the reactor, measuring the sensor output at zero frequency (DC) and at specified frequencies (AC), and determining the original concentration of the gas of interest in the measurement gas from the measured sensor output at zero frequency and at the specified frequencies.