"photoactivated nonintrusive tracking of molecular motion" (PHANTOMM). The PHANTOMM technique initially relied on a fluorescein-based caged dye excited by a blue laser. More recently, a rhodamine-based caged dye was successfully used with pulsed UV and green lasers. See also Hot-wire anemometry Particle image velocimetry Laser-induced fluorescence References Further reading Laser applications Measurement Fluid dynamics Transport phenomena