Power spectra of fluid velocities measured by laser Doppler velocimetry

R. J. Adrian, C. S. Yao

Research output: Contribution to journalArticlepeer-review

130 Scopus citations

Abstract

The power spectrum and the correlation of the laser Doppler velocimeter velocity signal obtained by sampling and holding the velocity at each new Doppler burst are studied. Theory valid for low fluctuation intensity flows shows that the measured spectrum is filtered at the mean sample rate and that it contains a filtered white noise spectrum caused by the steps in the sample and hold signal. In the limit of high data density, the step noise vanishes and the sample and hold signal is statistically unbiased for any turbulence intensity.

Original languageEnglish (US)
Pages (from-to)17-28
Number of pages12
JournalExperiments in Fluids
Volume5
Issue number1
DOIs
StatePublished - Jan 1 1986
Externally publishedYes

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

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