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Turbulent transport measurements with a laser Doppler velocimeter

Author
Edwards, R. V.
Published
JAN 1, 1972.
Physical Description
1 electronic document
Additional Creators
Angus, J. C. and Dunning, J. W., Jr.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
The power spectrum of phototube current from a laser Doppler velocimeter operating in the heterodyne mode has been computed. The spectrum is obtained in terms of the space time correlation function of the fluid. The spectral width and shape predicted by the theory are in agreement with experiment. For normal operating parameters the time average spectrum contains information only for times shorter than the Lagrangian integral time scale of the turbulence. To examine the long time behavior, one must use either extremely small scattering angles, much longer wavelength radiation or a different mode of signal analysis, e.g., FM detection.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19730007948.
Accession ID: 73N16675.
NASA-TM-X-68184.
E-7299.
Pacific Chem. Eng. Meeting; 10-14 Oct. 1972; Kyoto; Japan.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15944103