Method and device for detecting the concentration of an...

Details Method and device for detecting the concentration of an... Method and device for detecting the concentration of an...

2006-07-11

2006-07-11

Williams, Hezron (Department: 2856)

Measuring and testing

Gas analysis

Gas of combustion

C204S424000

Reexamination Certificate

active

07073369

ABSTRACT:
A method and an arrangement for determining the concentration of an oxygen-containing compound in a test gas in an external volume are presented with the external volume containing also additional oxygen. The method utilizes a sensor having a first cavity which is connected to the external volume via a first diffusion barrier and a second cavity which is connected to the first cavity via a further diffusion barrier. In addition, means for reducing the oxygen concentration in the first cavity and means for detecting the concentration of oxygen in the second cavity are provided. The reduction of the oxygen concentration in the first cavity takes place in a first phase to a value at which a change of the concentration of the oxygen-containing compound does not occur. In a second phase, a further reduction takes place in the first chamber to a value at which also a reduction of the concentration of the first oxygen-containing compound occurs. An index for the sought-after concentration is formed as the difference of the oxygen concentrations detected in the first and second phases in the second cavity.

REFERENCES:
patent: 5763763 (1998-06-01), Kato et al.
patent: 5879525 (1999-03-01), Kato
patent: 6010615 (2000-01-01), Kato et al.
patent: 6071393 (2000-06-01), Oshima et al.
patent: 6635162 (2003-10-01), Sugaya et al.
patent: 0392447 (1990-10-01), None
patent: 0678740 (1995-10-01), None
patent: WO 99 57556 (1999-11-01), None
“Thick Film ZrO2 NOx Sensor” by Kato et al, SAE Technical Paper Series 960334, International Congress & Exposition, Detroit, Michigan, 1996, pp. 137 to 142.

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