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Molecular Tagging Velocimetry
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“Molecular
tagging velocimetry”
marks fluids with caged fluorescent molecule dyes that can be activated
by exposure to a pulse of ultraviolet light. In its simplest form the
light may be a simple beam that ‘writes’ a line in the fluid.
Tracking the displacement of the line in time yields an approximate
measure of the velocity component perpendicular to the line. More
complex illuminating schemes can produce a dye pattern in the form of a
two-dimensional grid, from which two velocity components can be
measured. This method is useful if light scattering particles cannot be
inserted into the flow.|
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