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 language||English (US)|
|Title of host publication||American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED|
|Editors||Alexander Dybbs, Phillip A. Pfund|
|Place of Publication||New York, NY, USA|
|Number of pages||12|
|State||Published - 1985|
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