High-resolution visualization of fluid dynamics with Doppler optical coherence tomography

In this paper, we introduce a non-invasive high-resolution imaging technique, called Doppler optical coherence tomography (DOCT), to visualize the structural and fluid flow information in the complex flow geometry for industrial applications. The technique is based on the combination of laser Doppler velocimetry with the recently developed optical coherence tomography to obtain simultaneously high-resolution tomographic images of static and moving constituents in highly scattering media. It is shown that DOCT is capable of non-invasively monitoring complex flow geometry with a volumetric resolution of about 10³ cubic micrometres.