| 摘要 |
The invention relates to a device for determining the distance (.DELTA.x) between at least one rotor blade (14) and at least one wall (111) of a gas turbine, surrounding the at least one rotor blade (14). Said device comprise s a wave guide (40) for guiding electromagnetic waves (31, 32) and emitting electromagnetic waves (31) in the direction of the rotor blade (14) through at least one wave guide opening (41) facing the rotor blade (14), at least o ne means (51) for injecting the electromagnetic waves (31) into the wave gui de (40), and at least one means (52) for receiving reflected portions (32) o f the electromagnetic waves (31) to be injected into the wave guide (40). Th e device also comprises an evaluation unit (60) for evaluating the reflected portions (32) to be received of the electromagnetic waves (31) to be inject ed, comprising means (61) for comparing the phase of the electromagnetic wav es (31) to be injected to the phase of the reflected portions (32) of the el ectromagnetic waves (31) to be injected, a phase comparison value being dete rmined for every frequency by means of the evaluation unit and the distance (.DELTA.x) being determined from a comparison of the phase comparison values . The wave guide (40) is configured from at least two wave guide segments (4 2a, 42b, 42c) which are made from different materials, the temperature stabi lity and the damping capacity for the electromagnetic waves (31, 32) of the materials increasing in the direction of the segment (42a) having the wave g uide opening (41) starting from the segment (42c) that is connected to the m eans (51, 52) for injecting and receiving the waves.
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