Chemistry: analytical and immunological testing – Oxygen containing – Molecular oxygen
Patent
1997-08-04
1998-08-25
Snay, Jeffrey
Chemistry: analytical and immunological testing
Oxygen containing
Molecular oxygen
436137, 436151, 436167, G01N 2712
Patent
active
057982694
ABSTRACT:
The invention is a sensing method and an oxygen sensor for detecting a change of oxygen partial pressure in an ambient atmosphere. The sensor includes a sensing material selected from metal or its oxides which, when at an elevated temperature and exposed to a gas containing E 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. Heating elements, connectable to a power source, able to maintain a temperature gradient across said sensing material are necessary to maintain the material, during active sensing operation, in at least two of the phases defining a boundary line therebetween which is generally perpendicular to the longitudinal axis of the temperature gradient. The boundary line traverses longitudinally along the axis in response to changes in the oxygen partial pressure of the ambient atmosphere to which the sensing material is exposed. The sensor also includes a device for furnishing an output signal in response to the traversal of the boundary line across a fixed detecting location of the sensing material. Hence, the invention senses the passage of the boundary line at some specific location in the material to detect a specific P.sub.02,c.
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Logothetis Eleftherios Miltiadis
Soltis Richard E.
Ford Global Technologies Inc.
Melotik Lorraine S.
Snay Jeffrey
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