A Measure of Flow Vorticity with Helical Beams of Light

TL;DR

This paper introduces an optical method using Laguerre-Gauss beams to directly measure flow vorticity, offering a potentially accurate and localized sensing technique for complex fluid dynamics in various scientific fields.

Contribution

The paper presents a novel optical sensing technique employing Laguerre-Gauss beams to measure vorticity directly from the azimuthal flow component using the transversal Doppler effect.

Findings

Effective measurement of vorticity using LG beams demonstrated

The method provides accurate estimates of flow vorticity

Optical sensing is simple and adaptable for various fluid flows

Abstract

Vorticity describes the spinning motion of a fluid, i.e., the tendency to rotate, at every point in a flow. The interest in performing accurate and localized measurements of vorticity reflects the fact that many of the quantities that characterize the dynamics of fluids are intimately bound together in the vorticity field, being an efficient descriptor of the velocity statistics in many flow regimes. It describes the coherent structures and vortex interactions that are at the leading edge of laminar, transitional, and turbulent flows in nature. The measurement of vorticity is of paramount importance in many research fields as diverse as biology microfluidics, complex motions in the oceanic and atmospheric boundary layers, and wake turbulence on fluid aerodynamics. However, the precise measurement of flow vorticity is difficult. Here we put forward an optical sensing technique to obtain a direct measurement of vorticity in fluids using Laguerre-Gauss (LG) beams, optical beams which show an azimuthal phase variation that is the origin of its characteristic non-zero orbital angular momentum. The key point is to make use of the transversal Doppler effect of the returned signal that depends only on the azimuthal component of the flow velocity along the ring-shaped observation beam. We found from a detailed analysis of the experimental method that probing the fluid with LG beams is an effective and simple sensing technique capable to produce accurate estimates of flow vorticity.