Gas analysis apparatus
US4547281A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1985 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | May 2, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4075
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas concentration sensing or pumping device is formed of a body of solid electrolyte material which exhibits ionic conduction when the concentration of gas is different between first and second surfaces of the body, or which, upon application of a voltage across the body, will cause gas on one side of the body to be pumped to the other side. A thin film of a composition comprising an element selected from the group consisting of rare earth elements, alkaline earth metals, Ga Pb, In, Sn, Ti, Mo and W wherein Bi is the predominant element is formed on a major surface of the body to enhance conductivity at the electrode/body interface. Conductive electrode layers are formed over the film and an opposing major surface. The conductive layers may be formed of porous LaCrO.sub.3 and the body may be formed of ZrO.sub.2, CeO.sub.2 or ThO.sub.2. An apertured disc or a layer of gas permeable material is formed over the sensor. A voltage is applied across the body of solid electrolyte causing transport of oxygen through the aperture or pores. The output current measures the oxygen concentration passing therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.