Gas detecting sensor
US4453397A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1982 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | Mar 4, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas detecting sensor for precisely detecting the partial pressure of oxygen gas in the exhaust gases without being affected by the change of the temperature of the environment thereof, is disclosed. The sensor is provided with a ceramic base member, a film-shaped gas sensing element having a characteristic in response to the partial pressure of oxygen gas which is held by the base member so as to be exposed to the exhaust gases, a film shaped temperature sensing element having temperature coefficient of resistance substantially equal to that of the gas sensing element, which is held by the base member so as to be isolated from the exhaust gases, and an electric current wherein the gas and the temperature sensing elements are connected to each other in series to form an electric junction therebetween, from which output voltage is taken. In the preferred embodiment, the temperature sensing element is embedded within the base member and a heating member is further provided for maintaining both elements within a temperature range in which temperature coefficient of resistance of both elements are substantially equal to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.