期刊
OPTICS EXPRESS
卷 24, 期 11, 页码 1762-1767出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.24.011762
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- Air Force Office of Scientific Research (AFOSR) [FA9550-14-1-0312]
- Michigan State University Office of the Vice President of Research and Graduate Studies
Vorticity is one of the most important dynamic flow variables and is fundamental to the basic flow physics of many areas of fluid dynamics, including aerodynamics, turbulent flows and chaotic motion. We report on the direct measurements of fluid flow vorticity using a beam with orbital angular momentum that takes advantage of the rotational Doppler shift from microparticles intersecting the beam focus. Experiments are carried out on fluid flows with well-characterized vorticity and the experimental results are found to be in excellent agreement with the expected values. This method allows for localized real-time determination of vorticity in a fluid flow with three-dimensional resolution. (C)2016 Optical Society of America
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