Measuring and testing – Gas analysis – Gas of combustion
Patent
1997-08-04
1999-08-24
Williams, Hezron
Measuring and testing
Gas analysis
Gas of combustion
73 2901, 73 3101, 73 3105, 422 83, 422 90, 436137, G01N 2712, G01N 2746
Patent
active
059426748
ABSTRACT:
The invention is a sensing method and an oxygen sensor for detecting a change of oxygen partial pressure in an ambient atmosphere through a change of a measurable physical property of a sensing material. The sensor includes a sensing material selected from metal or its oxides which, when at an elevated temperature and exposed to a gas containing a changing partial pressures of oxygen, is capable of changing from one metal or metal oxide phase to another such oxide phase and vice versa. Associated with such phase change is a change in a measurable physical property of the material. The sensor also includes heating means, connectable to a power source, maintaining a temperature gradient across the sensing material since it is critical that the sensing material exist in at least two phases during active sensing. An output signal is furnished in response to the change in a physical property, like electrical resistance, of a portion of or of the entire material in response to change in oxygen partial pressure.
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Logothetis Eleftherios Miltiadis
Soltis Richard E.
Ford Global Technologies Inc.
Melotik Lorraine S.
Wiggins J. David
Williams Hezron
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