Electrode structure for a high temperature capacitance probe for sensing turbine speed
US4329644A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1980 |
| Grant date | May 11, 1982 |
| Priority date | — |
| Expiry date | Apr 3, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/483
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A probe is constructed for placement in the hot turbine section of a gas turbine engine. A housing containing two electrodes extends through the turbine shroud into the tip clearance area of the turbine rotor. A voltage impressed across the electrodes will generate an electric field in the vicinity of the turbine blades which will be distorted as the blades pass, thereby generating a charge pulse at the output of the probe. The electrode conductors are imbedded in pins which are retained by insulating rings brazed in place. The electrodes extend slightly outward from the surrounding insulating surfaces to create an air gap around each electrode. This air gap provides additional insulation and prevents contamination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.