Measuring the probability distribution of velocity differences using homodyne correlation spectroscopy

Gregory A. Zimmerli; K. Y. Min; Walter I. Goldburg

doi:10.1117/12.365761

13 October 1999 Measuring the probability distribution of velocity differences using homodyne correlation spectroscopy

Gregory A. Zimmerli, K. Y. Min, Walter I. Goldburg

Proceedings Volume 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids; (1999) https://doi.org/10.1117/12.365761
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

A novel method of measuring the probability density of velocity differences in turbulent flow is described. The method is based on the light-scattering technique known as homodyne correlation spectroscopy. Using fiber optic probes to image two different scattering volumes in a turbulent fluid, it is possible to recover the probability density function of velocity differences without invoking Taylor's frozen turbulence assumption. The design of the instrument is described, together with the optical alignment procedure. Some of the fundamental limitations to the accuracy of the technique are discussed. Measurements of the pdf from uniform and turbulent flow are presented, where the turbulence was generated using a mechanical stirrer in a beaker of water.

Citation Download Citation

Gregory A. Zimmerli, K. Y. Min, and Walter I. Goldburg "Measuring the probability distribution of velocity differences using homodyne correlation spectroscopy", Proc. SPIE 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids, (13 October 1999); https://doi.org/10.1117/12.365761

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