NASA Technical ' Mem 6 andum 100072 Laser Doppler Anemometry
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The application of time series analysis to Laser Doppler Anemometry data
Turbulence data is analysed with time series analysis. The data was measured in a shallow flow facility with Laser Doppler Anemometry (LDA). A regularly sampled signal is extracted from the irregular LDA-data using Nearest Neighbor Resampling (NNR). NNR is used because it is robust and provides an unbiased estimate of the variance. From the resampled signal a time series model is estimated. The...
متن کاملSizing of inhomogeneous particles by a differential laser Doppler anemometer
A particle moving across the interference pattern of two intersecting laser beams scatters the incident light with a temporal variation that enables the calculation of particle velocity. This idea was realized in laser Doppler anemometry (LDA). By recording the light scattering pattern with a fast line scan sensor, the spatial modulation of the signal is also detected. This yields, in addition ...
متن کاملFlow Generated by an Aerated Rushton Impeller: Two-phase PIV Experiments and Numerical Simulations
Experiments Most publications of velocity measurements in stirred tanks concern measurements in single-phase flows. An excellent review of these studies was made by Ranade and Joshi (1990a). Literature concerning velocity measurements in aerated stirred tanks is scarcer however. An overview of literature is given in Table 1. Lu and Ju (1987) used constant temperature anemometry (CTA) in order t...
متن کاملPresent methods to estimate the cross-correlation and cross-spectral density for two-channel laser Doppler anemometry
For the estimation of the autocorrelation and the auto-spectral density from irregularly sampled laser Doppler data sets three types of estimators are known, the slotting technique, the direct spectral estimation and the interpolation with filter correction. In this paper similar estimation techniques are discussed for the cross-correlation and the cross-spectral density case of two randomly sa...
متن کاملThe Development of Multi - Point Laser Doppler Anemometry ( MPLDA ) : A New Method to Estimate Fluid Flow Statistics
In this paper we describe a method to measure fluid flow fields that we call Multi-Point Laser Doppler Anemometry (MPLDA). Like Doppler Global Velocimetry (DGV) and single point Laser Doppler Anemometry (LDA), the technique derives information from the Doppler shift observed when light is scattered from a moving particle and exploits the advantages of these techniques. The method retains the el...
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تاریخ انتشار 2003