Errors Due to Turbidity in Particle Sizing Using Laser-Doppler Anemometry

[+] Author and Article Information
Y. Kliafas, A. M. K. P. Taylor, J. H. Whitelaw

Department of Mechanical Engineering, Imperial College of Science and Technology, London SW7 2BX, England

J. Fluids Eng 112(2), 142-148 (Jun 01, 1990) (7 pages) doi:10.1115/1.2909377 History: Received August 30, 1986; Online May 23, 2008


Flow turbidity, when introduced between the transmitting and receiving optics and the measuring volume of a laser-Doppler anemometer, changes the pedestal amplitude and visibility of the signal. The purpose of this work is to assess the effect on the accuracy of particle sizing, based on measurements of these two quantities, for depths of field of 5 and 10 cm, interrupting particle diameters between 14 to 212 μm in three discrete ranges and void fractions up to 0.1 percent. The turbidity introduces random fluctuations in visibility which increase with void fraction and the resulting rms errors in particle diameter for turbidity introduced on the receiving side of the optics are smaller than 10 percent at void fractions below 0.1 percent. For particles larger than about one third of the beam diameter, the influence of turbidity is largely due to the interruption of the incident beams over the 5 cm nearest to the measuring volume.

Copyright © 1990 by The American Society of Mechanical Engineers
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