title: Low-coherence self-referencing velocimetry.
abstract: Low-coherence self-referencing velocimetry optically measures the relative velocity between a point in a particle-laden fluid and a (potentially moving) reference surface. Low-coherence light scattered off the particles and off the reference surface is coupled into an interferometer with variable optical delay in one arm and an acousto-optical modulator in the second arm. The measurement location is set relative to the reference surface. Its location can be scanned along a line by adjusting the optical delay in the interferometer. The spatial resolution is typically tens of micrometers. Only one low-coherence light beam is required for each component of the velocity vector. Proof-of-principle measurements in Taylor-Couette flow are presented.
authors: Institute of Fluid Dynamics, ETH Zürich, Zürich, Switzerland. kempe@ifd.mavt.ethz.ch
authors: Andreas
authors: A
authors: Kempe
authors: Stefan
authors: S
authors: Schlamp
authors: Thomas
authors: T
authors: Rösgen