Laser Doppler velocimeter system for turbine stator cascade studies and analysis of statistical biasing errors
National Aeronautics and Space Administration, 1977 - Technology & Engineering - 46 pages
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1-microsecond OSM 6.25 micrometers amplitude analysis angle between fringe angle biasing error beam crossing point beam radius beam waists calculated centimeters complex radius computing counter cross section crossing angle data processing distance between waist divide-by-eight counter Doppler burst Doppler frequency equation equivalent thin lens flip-flop flow angle focusing lens fringe intensity fringe normals fringe spacing gate Gaussian beam Gaussian mode high-pass filter laser cavity laser Doppler velocimeter laser output mirror LDV optical system LDV system lenses mean flow direction mean velocity megahertz mode matching multivibrator normals and mean number of fringes optical path length parameters particle diameter particle size distribution path length photomultiplier tube plane preset probe volume diameter radii radius of curvature receiving optics Schmitt trigger shown in figure single thin lens spherical aberration standard deviation stator cascade facilities system gain turbine stator cascade turbulence intensity turbulent flow velocity component velocity magnitude waist radius wavefront radius wavelength