Patent ID: 8683866
Filing Date: 2014-04-01
Classification: G01H

Abstract:
1. A method of matching sensors in a multi-probe blade vibration monitor for a turbine, said turbine comprising a blade structure formed by a plurality of radially extending blades mounted on a rotor for rotation about a rotational axis, said blade structure including a plurality of targets located at radially outer locations of said blade structure, the method comprising: providing at least two probes mounted in a casing of said turbine adjacent to said blade structure, each of said probes including a sensor; generating signals from each of said sensors corresponding to target passing events when each said target passes said sensors; analyzing said signals to create, for each said sensor, a set of synchronous harmonics wherein each set of synchronous harmonics is synchronous to the rotational speed of said rotor; and positioning said sensors including moving at least one of said sensors such that, for at least two of said sensors, said sets of synchronous harmonics are substantially matched, indicating that said at least two sensors are at matched axial locations relative to said plurality of targets.