An analysis of a laser anemometer is given. The anemometer is based on the cross correlation of the random signals generated by the scattering from -- and/or extinction of -- two parallel laser beams. The basic set-up is compared with the laser Doppler anemometer.
It is shown that the correlation function exhibits a broadening and generally also a skewness - equivalent to the broadening (transit time) and skewness (velocity gradients) of the Doppler spectrum.
The conditions for "instantaneous point" measurements are derived.
It is shown how a particle (drop/bubble) size versus particle velocity spectrum can be obtained by appropriate electronic filtering before the signals are correlated, provided the particle diameters are much larger than the beam diameters.
A specific application in a two-phase flow is described.
Lading, L., "Analysis of a Laser Correlation Anemometer" (1973). Symposia on Turbulence in Liquids. 112.
3rd Biennial Symposium on Turbulence in Liquids (1973: Sep., Rolla, MO)
Chemical and Biochemical Engineering
Article - Conference proceedings
© 1973 University of Missouri--Rolla, All rights reserved.