High sensitivity phase transformation-based oxygen sensors for p

Details High sensitivity phase transformation-based oxygen sensors for p High sensitivity phase transformation-based oxygen sensors for p

1997-08-04

1999-03-02

Snay, Jeffrey

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

422 95, 338 34, G01N 2712

Patent

active

058766731

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 an electrical heating source, 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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