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The measurement of turbulence intensities using real-time laser-Doppler velocimetry

Published online by Cambridge University Press:  29 March 2006

William K. George
William K. George
Affiliation:
Applied Research Laboratory, The Pennsylvania State University, State College Present address: Department of Mechanical Engineering, State University of New York at Buffalo, New York 14214.
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Abstract

A technique by which the effect of the random phase fluctuations or Doppler ambiguity can be removed from measurements of turbulence intensities by the laser-Doppler velocimeter is proposed. Because the ambiguity is often much broader band than the turbulence, it is proposed that a sequence of low-pass filters at frequencies above those of the turbulence be used in the measurement of turbulence intensities. The true turbulence intensity is given by the extrapolation of these measurements to zero frequency.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 66 , Issue 1 , 21 October 1974 , pp. 11 - 16
Copyright
© 1974 Cambridge University Press

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Footnotes

The term real-time has been adopted to distinguish this from discrete-realization velocimetry.

References

Abramowitz, M. & Stegun, I. A. 1964 Handbook of Mathematical Functions, p. 297. Washington: Nat. Bur. Stand.
Berman, N. S. & Dunning, J. 1973 J. Fluid Mech. 61, 289.
George, W. K. & Berman, N. S. 1973 Appl. Phys. Lett. 23, 222.
George, W. K. & Lumley, J. L. 1973 J. Fluid Mech. 60, 321.
Jenkins, G. M. & Watts, D. G. 1968 Spectral Analysis and Its Applications, pp. 38–39. San Francisco: Holden Day.
Rowe, D. S. 1973 Pacific N.W. 'Lab., Richland, Wash., Atomic Energy Comm. Rep. BNWL–1736.