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Optical measurement of propeller blade deflectionsA nonintrusive optical method for measurement of propeller blade deflections is described and evaluated. It does not depend on the reflectivity of the blade surface but only on its opaqueness. Deflection of a point at the leading edge and a point at the trailing edge in a plane nearly perpendicular to the pitch axis is obtained using a single light beam generated by a low-power helium-neon laser. Quantitative analyses are performed from taped signals on a digital computer. Averaging techniques are employed to reduce random errors. Measured deflections from a static and a high-speed test are compared with available predicted deflections which are also used to evaluate systematic errors.
Document ID
19880018902
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Kurkov, Anatole P. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 8, 2013
Publication Date
September 1, 1988
Subject Category
Instrumentation And Photography
Report/Patent Number
E-4131
NASA-TP-2841
NAS 1.60:2841
Accession Number
88N28286
Funding Number(s)
PROJECT: RTOP 535-03-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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