Measurement of Particle Accelerations with the Laser Doppler Technique
H. Nobach, M. Kinzel, R. Zimmermann, C. Tropea, E. Bodenschatz
Second International Conference on Turbulence and Interaction, May 31-June 5, 2009, Karibea Resort Sainte-Luce, Sainte-Luce, Martinique
Abstract An extension of the laser Doppler technique for measuring particle acceleration is shown. The basic principles of the technique follow closely those introduced in Lehmann et al. (2002), although numerous improvements have been implemented in the signal processing for increasing the reliability of individual estimates of particle acceleration. The main contribution of this study is to assess the accuracy of the estimates and to quantify the errors due to optical fringe divergence in the detection volume and due to the signal processing. These error estimates are verified using a dedicated experiment involving a falling wire and by comparison to acceleration measurements made by the particle tracking technique in a highly turbulent flow. Noteworthy is the fact that all measurements were performed using a commercial off-the-shelf laser Doppler system.
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