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• W2005804567 abstract "Phase Doppler anemometry (PDA) is a laser optical method to determine particle diameters and velocities within two-phase or multiphase flows simultaneously and with high spatial and temporal resolution. The measured phase difference between two Doppler bursts is related to the particle diameter. The proposed method for signal processing is based on a combined Hilbert transform and Fast Fourier transform (FFT) phase Doppler burst analysis. The numerical determination of the burst envelopes gives an estimation of the time delay between two related signals or, more generally, of the burst maximum position within the record time. This estimate is completed by the conventional FFT based signal analysis which is used to estimate frequency and phase difference. By this two-step estimation the restriction to the interval resulting from conventional signal processing can be avoided. The feasibility of the method in terms of an on-line determination of absolute phase differences is investigated by Monte Carlo simulations and demonstrated by means of a standard PDA arrangement with ball lenses rotating as spherical particles through the measurement volume. Phase differences up to were determined reliably. In addition, algorithms to calculate Doppler frequencies and Doppler intensities, burst lengths and further characteristic parameters taking the signal quality into account are introduced and studied by Monte Carlo simulations. Based on these results validation strategies to reduce the influence of maltriggered bursts, trajectory or Gaussian beam effects on measurement results can be developed. Furthermore, by using the information of burst length and maximum position, optimized signal processing algorithms can be realized in order to achieve maximum accuracy in frequency, phase difference and signal-to-noise ratio (SNR) estimation." @default.
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• W2005804567 date "1997-04-01" @default.
• W2005804567 modified "2023-09-26" @default.
• W2005804567 title "Features of a combined FFT and Hilbert transform for phase Doppler signal processing" @default.
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• W2005804567 doi "https://doi.org/10.1088/0957-0233/8/4/008" @default.
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