Method of observing change in a shape

Details Method of observing change in a shape Method of observing change in a shape

1984-09-18

1986-10-14

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

356426, G01B 1124

Patent

active

046169326

ABSTRACT:
Gas turbine engine compressor blades tend to untwist and decamber when subjected to working loads. Previous methods of observing the phenomenum and recording the magnitude of distortion have been restricted to the blade outer extremity, and to delayed display of the results. The invention provides a laser beam which is movable lengthwise of the blades and which effectively traverses each blade in a chordal direction. Photo devices pick up the light spot on each blade in turn and the signals produced are combined with signals representative of the speed of revolution of the blades and passed to an oscilloscope e.g. which immediately displays the shape of the blades.

REFERENCES:
patent: 4049644 (1977-09-01), Wennerstrom
patent: 4060329 (1977-11-01), Ellis

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