Presentation Information
[8a-PB1-5]Non-Contact Tracking of Powder Particles Using Persistent Luminescence
〇Tomohiko Hayakawa1, Yuka Hiruma1, Yushi Moko1, Masatoshi Ishikawa1 (1.Tokyo Univ. of Science)
Keywords:
Persistent Luminescence,Tracking,Powder
Detecting clogging and stagnation during powder conveyance is a key challenge in the food, pharmaceutical, and cosmetics industries, where non-contact, real-time monitoring is needed but powders are feature-poor and resist markerless, image-based optical tracking. We propose a non-contact, additive-free method that exploits the long persistent luminescence (afterglow) induced on the powder itself by ultraviolet illumination, turning the powder into its own dynamic marker. A pulsed 375 nm UV laser excites a spot on wheat flour conveyed on an electromagnetic vibrating feeder, and a high-speed, high-sensitivity camera images the afterglow, which a lightweight pipeline detects and tracks. The method successfully tracks a feature-poor powder with no added tracer, demonstrating non-contact tracking on a textureless target. Displacement is currently evaluated qualitatively per frame; conversion to mm/s, a wider range of powders, and extension to two-dimensional tracking remain future work.