DEVICE FOR DETERMINING THE DISTANCE BETWEEN WORKING ENVIRONMENT blades and the rotor blades of the machine FOR FLOW conversion of kinetic energy into mechanical energy

摘要

The invention relates to a device for determining the distance (?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 comprises 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 one means (51) for injecting the electromagnetic waves (31) into the wave guide (40), and at least one means (52) for receiving reflected portions (32) of the electromagnetic waves (31) to be injected into the wave guide (40). The device also comprises an evaluation unit (60) for evaluating the reflected portions (32) to be received of the electromagnetic waves (31) to be injected, comprising means (61) for comparing the phase of the electromagnetic waves (31) to be injected to the phase of the reflected portions (32) of the electromagnetic waves (31) to be injected, a phase comparison value being determined for every frequency by means of the evaluation unit and the distance (?x) being determined from a comparison of the phase comparison values. The wave guide (40) is configured from at least two wave guide segments (42a, 42b, 42c) which are made from different materials, the temperature stability and the damping capacity for the electromagnetic waves (31, 32) of the materials increasing in the direction of the segment (42a) having the wave guide opening (41) starting from the segment (42c) that is connected to the means (51, 52) for injecting and receiving the waves.