Apparatus for precise detection of blade passing times in a steam turbine
US4922757A · kind A · utility
23Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1988 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Jun 13, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H1/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for detecting blade passing times includes a sensor for producing an input signal each time a blade passes the sensor. A zero crossing detector produces an output signal each time the input signal crosses a reference axis. A phase shifter shifts the phase of the input signal to produce a gating signal coinciding with the expected arrival time of the blade at the sensor. A gating device is responsive to the gating signal for conducting output signals which occur during the expected arrival time of the blade at the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.