Effect of non-Poisson samples on turbulence spectra from laser velocimetry
- Tuskegee Univ., Tuskegee, AL (United States)
Spectral estimations from LV data are typically based on the assumption of a Poisson sampling process. It is demonstrated here that the sampling distribution must be considered before spectral estimates are used to infer turbulence scales. A non-Poisson sampling process can occur if there is nonhomogeneous distribution of particles in the flow. Based on the study of a simulated first-order spectrum, it has been shown that a non-Poisson sampling process causes the estimated spectrum to deviate from the true spectrum. Also, in this case the prefiltering techniques do not improve the spectral estimates at higher frequencies. 4 refs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 57280
- Journal Information:
- AIAA Journal, Vol. 32, Issue 12; Other Information: PBD: Dec 1994
- Country of Publication:
- United States
- Language:
- English
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