Actions for Optimization of fringe-type laser anemometers for turbine engine component testing

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Optimization of fringe-type laser anemometers for turbine engine component testing

Author
Seasholtz, R. G.
Published
JAN 1, 1984.
Physical Description
1 electronic document
Additional Creators
Weikle, D. H. and Oberle, L. G.
Online Version

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Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
The 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.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19840016951.
Accession ID: 84N25019.
NASA-TM-83658.
NAS 1.15:83658.
E-2099.
AIAA PAPER 84-1459.
Joint Propulsion Conf.; 11-13 Jun. 1984; Cincinnati, OH; United States.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15707928