Signal processing system for flow velocity in laser doppler velo

Details Signal processing system for flow velocity in laser doppler velo Signal processing system for flow velocity in laser doppler velo

1989-07-10

1991-04-02

Lall, Parshotam S.

Boots, shoes, and leggings

364510, 356 285, G01P 336

Patent

active

050051440

ABSTRACT:
A period of a correlation signal from a laser Doppler velocimeter is calculated from crossing points at which a correlation function crosses over a threshold level by clipping and digitizing a Doppler burst signal, thereby enabling an accurate and real time measurement to be made of a flow velocity, even in low SNR Doppler signals. Smoothing the waveform of a correlation signal further improves measurement accuracy. When the threshold level is set to be the 1/2 value of the autocorrelation function at .tau.=0, a crossing point is precisely detected even in an uneven correlation function or small amplitude of the crosscorrelation function, thus further increasing measurement accuracy.

REFERENCES:
patent: 3777133 (1973-12-01), Beck et al.
patent: 3824015 (1974-07-01), Petit et al.
patent: 3842252 (1974-10-01), Jakeman et al.
patent: 4019038 (1977-04-01), Critten et al.
patent: 4244026 (1981-01-01), Dickey, Jr.
patent: 4596254 (1986-06-01), Adrian et al.
patent: 4843564 (1989-06-01), Jenson
Adrian, "High Speed Correlation Techniques", TSI Quarterly, pp. 3-9, 1982.
Matovic et al., "Frequency Estimation of LDA Signals by Model Parameter Estimation," Proceedings: The Use of Computers in Laser Velocimetry, ISL, 22-1-22-7, 1987.
Adrian et al., "Correlation and Spectrum of Doppler Signal Zero Crossings Using a Photon Correlation Computer," J. Phys. E. Sci. Instru., 21, 743-748 (1988).
Radke et al., "Fluid Flow Investigations in Rotating Axial Pump Impellers Using a Burst-Spectrum Analyzer," 1988 (supported by Technical University of Berlin).

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