Turbulence Measurements with a Laser Anemometer Measuring Individual Realizations

Abstract
A laser Doppler anemometer system is described which operates with a noncontinuous signal and measures the velocity of individual scattering centers. Histograms of the instantaneous individual velocity realizations provide accurate and unambiguous estimates of the mean velocity and rms fluctuation velocity in regions of intense turbulence levels. Measurements are presented for a fully developed two-dimensional water channel and a deflected jet of air.