Method of detecting deflections of parts of a rotating mass

Details Method of detecting deflections of parts of a rotating mass Method of detecting deflections of parts of a rotating mass

B - Operations, Transporting

64

C

354/18, 73/58

B64C 27/04 (2006.01) G01B 11/16 (2006.01) G01B 17/04 (2006.01) G01M 17/00 (2006.01) G06G 7/70 (2006.01)

Patent

CA 1212771

ABSTRACT In a method of detecting the deflection of the blades (13) of a helicopter rotor as it rotates, a beam (14) of radiation from a transmitter/receiver (11) encounters the tips of the rotating blades which send reflected signals to the receiver. The phase difference due to deflection of the blade tip can be used to give a measure of the deflection of each blade, and that can be displayed graphically for the various blades at various speeds. The measured deflections can be recorded for subsequent use. In prior proposals the blade tips were examined visually but no per- manent recording was made.

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