Flow velocity determining method for light scattering particle carrying fluid stream, involves determining displacement between local cross correlations, where displacement indicates visual component of displacement vector of particle

摘要

The method involves determining a pair of local cross correlations between corresponding regions of a straightened image incorporated at different times from different mapping directions, for a region of a light section (6) of interest. A displacement is determined between the local cross correlations, where the displacement indicates a visual component of a displacement vector of a light scattering particle (3) from the mapping directions into the region of the light section between the times. The displacement is determined as a third local cross correlation between other cross correlations. An independent claim is also included for a device for determining flow velocity in a light scattering particle carrying fluid stream.