| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide 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. <P>SOLUTION: In order to allow a reliable monitoring of the blades within the harsh turbine environment, in particular with an improved measurement precision, the invention proposes that the waveguide is included in a resonator defining at least one discrete resonance frequency of the electromagnetic wave on the waveguide and comprises an aperture at the front end thereof, through which a part of the electromagnetic wave can be emitted towards the blade tip. The device further comprises a frequency adjusting unit that is configured to set the frequency of the electromagnetic wave to the resonance frequency of the resonator at the momentary operation conditions, and a measuring unit that is configured to compare at least one measurement parameter of the electromagnetic wave emitted towards the blade tip with the corresponding measurement parameter of the electromagnetic wave reflected from the blade tip. <P>COPYRIGHT: (C)2013,JPO&INPIT |
