Data processing: measuring – calibrating – or testing – Measurement system – Speed
Reexamination Certificate
2008-12-19
2010-11-23
Bui, Bryan (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Speed
C324S233000
Reexamination Certificate
active
07840370
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.
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Clifton-Welker Matthew
Kulczyk Wojciech Konrad
Palmer Anthony
Bui Bryan
Nixon & Vanderhye P.C.
Weston Aerospace Limited
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