Gas sensor with pH-sensitive FET transducer
US4409980A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1981 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Aug 17, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4141
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas sensor which includes a reference electrode deposited on the surface of a pH-sensitive transducer having a gate-insulated field-effect transistor (FET) structure and adjacent a gate region of the FET, the transducer and reference electrode being housed in a flexible tube so that the gate region of the FET is located in an opening provided at the front end of or on the side wall of the tube. Lead wires connected to the FET and to the reference electrode extend along the tube. Between the inner wall of the tube and lead-wire FET bonding part is placed electrical insulation resin filling to stop the tube. A hydrophilic polymer layer containing electrolyte is provided which at least extends over both the FET gate region and a part of the reference electrode. A gas permeable membrane is laid over the polymer layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.