Sub-diffusion flow velocimetry with number fluctuation optical coherence tomography

Journal article (2023)

Authors

K. Cheishvili ImPhys/Kalkman group - AS
J. Kalkman ImPhys/Computational Imaging - AS , ImPhys/Kalkman group - AS
Research Group
ImPhys/Kalkman group (AS) (TU Delft)
Copyright: © 2023 K. Cheishvili, J. Kalkman
DOI: https://doi.org/10.1364/OE.474279
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Published Date

2023

Language

English

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Faculty

Applied Sciences

Department

ImPhys/Imaging Physics

Research Group

ImPhys/Kalkman group

Abstract

We have implemented number fluctuation dynamic light scattering optical coherence tomography (OCT) for measuring extremely slow, sub-diffusion flows of dilute particle suspensions using the second-order autocovariance function. Our method has a lower minimum measurable velocity than conventional correlation-based OCT or phase-resolved Doppler OCT, as the velocity estimation is not affected by the particle diffusion. Similar to non-dilute correlation-based OCT, our technique works for any Doppler angle. With our analysis we can quantitatively determine the concentration of particles under flow. Finally, we demonstrate 2D sub-diffusion flow imaging with a scanning OCT system at high rate by performing number fluctuation correlation analysis on subsequent B-scans

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