Device and method for monitoring rotor blades of a turbine
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United States of America Patent
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Jun 16, 2015
Grant Date -
Mar 21, 2013
app pub date -
Sep 11, 2012
filing date -
Sep 16, 2011
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Abstract
A device and a method for monitoring the operational state of rotor blades of a turbine from a position facing the blade tip of a passing rotor blade: A wavesource generates an electromagnetic wave and a wave guide directs the wave towards the blade tip. The waveguide is included in a resonator defining at least one discrete resonance frequency of the wave on the waveguide. An aperture at its front end emits an energy fraction of the wave toward the blade tip. The frequency of the wave is adjusted to the resonance frequency of the resonator at the momentary operation conditions, and a measuring unit compares at least one measurement parameter of the wave directed towards the blade tip with the corresponding measurement parameter of the wave reflected from the blade tip.
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