Checking the location of moving parts in a machine

Details Checking the location of moving parts in a machine Checking the location of moving parts in a machine

1980-08-01

1982-08-24

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

324 355B, G01S 1308, G01R 2704

Patent

active

043463835

ABSTRACT:
In order to monitor the clearance between turbine blades and the casing of a turbine engine millimetric microwave radiation of wavelength .lambda. is propagated along a waveguide and through an aperture to a turbine blade. The aperture is small in relation to the area of the blade facing the aperture, and the aperture has a spacing of .lambda./4 or less from the blade. A balanced mixer compares the phase of the wave reflected from the blade with a reference pulse to provide a measure of the clearance.
Circuits may be provided for monitoring the spacings between blades, and to indicate blades which are damaged.

REFERENCES:
patent: 3199103 (1965-08-01), Augustine
patent: 3973259 (1976-08-01), Hellgren et al.
patent: 4045727 (1977-08-01), Yu et al.
patent: 4200921 (1980-04-01), Buckley

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