Method and apparatus for monitoring the rotational speed of...

Details Method and apparatus for monitoring the rotational speed of... Method and apparatus for monitoring the rotational speed of...

G - Physics

01

P

G01P 3/66 (2006.01)

Patent

CA 2647306

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 recognises that it is possible to 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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