Strömungsbeschleunigungsmessungen bei der Laser-Doppler-Anemometrie (Distortions within the Measuring Volume and Fluid Acceleration Measurements by Laser-Doppler-Anemometry)

2002 ◽  
Vol 69 (11/2002) ◽  
Author(s):  
K. Schröder ◽  
P. Lehmann ◽  
Armin Schöne
Keyword(s):  
Laser Doppler Anemometry ◽  
Laser Doppler ◽  
Measuring Volume

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

1990 ◽  
Vol 112 (2) ◽  
pp. 142-148 ◽  
Author(s):  
Y. Kliafas ◽  
A. M. K. P. Taylor ◽  
J. H. Whitelaw
Keyword(s):  
Laser Doppler Anemometry ◽  
Particle Diameter ◽  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Beam Diameter ◽  
Particle Sizing ◽  
Measuring Volume ◽  
Void Fractions ◽  
Random Fluctuations ◽  
Rms Errors

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.

scholarly journals Estimation of laser-Doppler anemometry measuring volume displacement in cylindrical pipe flow

2012 ◽  
Vol 16 (4) ◽  
pp. 1027-1042 ◽  
Author(s):  
Slavica Ristic ◽  
Jelena Ilic ◽  
Djordje Cantrak ◽  
Ognjen Ristic ◽  
Novica Jankovic
Keyword(s):  
Pipe Flow ◽  
Pipe Wall ◽  
Laser Doppler Anemometry ◽  
Laser Doppler ◽  
Test Rig ◽  
Axial Fan ◽  
Optical Aberrations ◽  
Cylindrical Pipe ◽  
Measuring Volume ◽  
Uncertainty Sources

Laser-Doppler anemometry application in measurements of the 3-D swirl turbulent flow velocity in the cylindrical pipe, behind the axial fan, have been analysed. This paper presents a brief overview of uncertainty sources in the laser-Doppler anemometry measurements. Special attention is paid to estimation of laser-Doppler anemometry measuring volume positioning in cylindrical pipe flow due to optical aberrations, caused by the pipe wall curvature. The hypothesis, that in the central part of the pipe (r/R < 0.6) exists a small, or negligible pipe wall influence on laser- -Doppler anemometry measuring position, is investigate. The required corrections, for measurements of axial, tangential, and radial velocity components such: shift of measuring volume and its orientation are analyzed and determined for used test rig and for some other pipe geometries.

Micropositioning of a measuring volume in laser Doppler anemometry

1993 ◽  
Vol 16 (1) ◽  
pp. 70-72 ◽  
Author(s):  
C. Bertrand ◽  
P. Desevaux ◽  
J. P. Prenel
Keyword(s):  
Laser Doppler Anemometry ◽  
Laser Doppler ◽  
Measuring Volume

Acoustic power flow measurement in a thermoacoustic resonator by means of laser Doppler anemometry (L.D.A.) and microphonic measurement

2000 ◽  
Vol 60 (1) ◽  
pp. 1-11 ◽  
Author(s):  
H. Bailliet ◽  
P. Lotton ◽  
M. Bruneau ◽  
V. Gusev ◽  
J.C. Valière ◽  
...  
Keyword(s):  
Flow Measurement ◽  
Power Flow ◽  
Laser Doppler Anemometry ◽  
Acoustic Power ◽  
Laser Doppler
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