Method and apparatus for monitoring the rotational speed of shaft
US7840370B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2008 |
| Grant date | Nov 23, 2010 |
| Priority date | — |
| Expiry date | Dec 19, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2270/304
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus for monitoring the rotational speed of a shaft, in particular a shaft having a number of spaced features on or rotating with the shaft. Preferred embodiments of the invention are concerned with methods and apparatuses for processing signals in order to calculate, with high accuracy and a fast response time, the rotational speed of a gas turbine shaft. The invention recognizes that it is possible to accurately measure speed between two eddy current sensors (5, 6) by determining the time take for a turbine blade to pass therebetween provided that appropriate compensation is made for the effect of apparent changes in the magnetic distance between the sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.