Method for detecting and obtaining information about changers in variables
US5235286A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1991 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | May 9, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/165
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An elongate sensor for detecting and locating presence of a liquid, e.g. water or a hydrocarbon. The sensor includes first and second elongate members which are spaced apart from each other and each of which is a metal conductor covered by a conductive polymer; a third, insulated elongate conductor; and an elongate insulating core. At least one of the elongate members is helically wrapped around the core. Presence of the liquid at any point along the length of the sensor causes the first and second members to be electrically connected at that point, creating a system in which the potential drop down one of the members can be measured and the location of the connection determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.