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 turbine engine, surrounding the at least one rotor blade (14). Said device comprises a wave guide (40) for guiding electromagnetic waves (31a, 31b, 32a, 32b) of different frequencies and for emitting electromagnetic waves (31a) of at least one frequency 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 (31a, 31b) of different frequencies into the wave guide (40), and at least one means (52) for receiving reflected portions (32a, 32b) of the electromagnetic waves (31a, 31b) to be injected into the wave guide (40). The device also comprises an evaluation unit (60) for evaluating the reflected portions (32a, 32b) to be received of the electromagnetic waves (31a, 31b) to be injected. The evaluation means (60) comprises means (61) for comparing the respective phases of the electromagnetic waves (31a, 31b) to be injected to the phases of the reflected portions (32a, 32b) of the electromagnetic waves (31a, 31b) to be injected, at least one 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 provided with at least one sealing element (70a) which is configured to be transmissible for the electromagnetic waves (31a, 32a) of the at least one frequency and which has two opposite surfaces (71a, 72a) in the direction of guidance of the electromagnetic waves (31a, 31b, 32a, 32b).