Single blade proximity probe

Details Single blade proximity probe Single blade proximity probe

1978-03-23

1979-12-25

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

250224, 356 23, 415118, G01B 1114

Patent

active

041803299

ABSTRACT:
A single blade proximity probe uses fiber optics to direct a laser output at turbine engine blades and to return the reflected light to an image intensifier probe which provides an output indicative of blade clearance. To enable the system to measure the clearance of a single blade tip on an operating turbine, a second light beam having a different wavelength from the laser output is directed over the laser light path to count the blades and to strobe the laser on the desired blade.

REFERENCES:
patent: 3327584 (1967-06-01), Kissinger
patent: 3599002 (1971-08-01), Beutelspacher et al.
patent: 3856410 (1974-12-01), Swift et al.
patent: 3908444 (1975-09-01), Peter
patent: 3917432 (1975-11-01), Feuerstein et al.
Drinkuth et al., "Laser Proximity Probes for Measurement of Running Turbine Tip Clearance," ISA Paper, 20th Annual Aerospace Instrument Symposium, May 21-23, 1974.

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