Effect of validation procedure on step noise amplitude in LDV spectra evaluation

The evaluation of turbulence power spectra from velocity data acquired by LDA is considered. An analysis of the effect of the validation procedure, implemented in many data processors, on the power spectrum obtained by the sample and hold method is reported and compared to experimental results. The...

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Bibliographic Details
Published in:Experiments in fluids 1998-05, Vol.24 (5-6), p.382-388
Main Authors: COGHE, A, COSSALI, G. E
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Instrumentation for fluid dynamics
Physics
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Summary:The evaluation of turbulence power spectra from velocity data acquired by LDA is considered. An analysis of the effect of the validation procedure, implemented in many data processors, on the power spectrum obtained by the sample and hold method is reported and compared to experimental results. The existence of a new term in the measured power spectrum step noise is predicted and experimentally verified, and a procedure for eliminating spectral bias and estimating the Taylor time scale is suggested and applied. (Author)
ISSN:0723-4864
1432-1114
DOI:10.1007/s003480050187