One specific velocity visualization in flows with complex geometry

摘要

Flows with complex geometries, converging flows in a symmetric die-entry and an asymmetric oblique dieentryare investigated by means of direction sensitive one specific velocity (OSV) imaging. Near infrared, 1.3nm, low coherence source giving resolution of about 10 micron is used for two-dimensional velocitymapping of the flows. Structural optical coherence tomography (OCT) images of a Y-junction of humansubcutaneous macro blood vessels, with diameter up to 1 mm, are acquired noninvasively and in vivo. Imagesare acquired with transcutaneous coherence probing depth up to 1.5 - 1.6 mm. Application of the opticalclearing and direction sensitive OSV imaging to monitor the blood flow in the subcutaneous human bloodvessels are discussed.