## Laser velocimeter systems analysis applied to a flow survey above a stalled wing |

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Airfoil surface angle of attack autocorrelations with respect average velocity backscatter mode bias error calculated common volume Correlations and Fourier Crosscorrelations and autocorrelations data-acquisition double peaks dropout zone flow field free-stream velocity fringe pattern fringe spacing high-pass filter high-speed burst counter Histogram moments Histograms above transducer histograms with Ul kerosene kHz h Langley Research Center laser beams laser velocimeter measured laser velocimeter optics low-pass filter m/sec Mach number mean velocity Measured histograms median moments for scan msec Frequency path center line percent chord photomultiplier pressure pulse pressure transducers prime direction probability density function reference clock Reynolds number scan above transducer shown in figure Simulated histograms skew smoke standard deviation trailing edge transducer 9 transducer position transforms of correla tufts Turbulence uncertainty upstream variation velocity and standard velocity bias velocity interval velocity measurements vortex model vortex path center vortices