Power spectra of fluid velocities measured by laser Doppler velocimetry

Ronald Adrian, C. S. Yao

Research output: Contribution to journalArticle

124 Citations (Scopus)

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 1986
Externally publishedYes

Fingerprint

Power spectrum
Velocity measurement
power spectra
Laser Doppler velocimeters
Fluids
Lasers
fluids
White noise
lasers
laser doppler velocimeters
Turbulence
noise spectra
Sampling
white noise
bursts
turbulence
sampling

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Computational Mechanics
  • Fluid Flow and Transfer Processes

Cite this

Power spectra of fluid velocities measured by laser Doppler velocimetry. / Adrian, Ronald; Yao, C. S.

In: Experiments in Fluids, Vol. 5, No. 1, 01.1986, p. 17-28.

Research output: Contribution to journalArticle

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