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Optimization of fringe-type laser anemometers for turbine engine component testingThe fringe type laser anemometer is analyzed using the Cramer-Rao bound for the variance of the estimate of the Doppler frequency as a figure of merit. Mie scattering theory is used to calculate the Doppler signal wherein both the amplitude and phase of the scattered light are taken into account. The noise from wall scatter is calculated using the wall bidirectional reflectivity and the irradiance of the incident beams. A procedure is described to determine the optimum aperture mask for the probe volume located a given distance from a wall. The expected performance of counter type processors is also discussed in relation to the Cramer-Rao bound. Numerical examples are presented for a coaxial backscatter anemometer. Previously announced in STAR as N84-25019
Document ID
19840057461
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Seasholtz, R. G.
(NASA Lewis Research Center Cleveland, OH, United States)
Oberle, L. G.
(NASA Lewis Research Center Cleveland, OH, United States)
Weikle, D. H.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
June 1, 1984
Subject Category
Instrumentation And Photography
Report/Patent Number
AIAA PAPER 84-1459
Accession Number
84A40248
Distribution Limits
Public
Copyright
Other

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