G - Physics – 01 – H
Patent
G - Physics
01
H
340/148
G01H 11/00 (2006.01) G01H 1/00 (2006.01) G01M 1/22 (2006.01) G01M 13/00 (2006.01)
Patent
CA 1234201
23 ABSTRACT OF THE DISCLOSURE A plurality of sensors are disposed equally about a blade row in a turbine with each sensor being operable to provide an output signal in response to a passing blade. A blade is selected for monitoring purposes by designating its degree location relative to a reference position ? some angular distance constituting a small window. As the selected blade passes a sensor, its output signal, properly conditioned to form a pulse, is grated during the time period corresponding to the window. The sequential pulses of the sensors form a pulse train which is modulated by any blade vibration. An FM detector is provided for demodu- lating the pulse train to derive vibration information.
484780
Oldham And Company
Westinghouse Electric Corporation
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