Volume 31, Issue 2 (April 1986)
Laser Excited Luminescence of Inclusions and Fibers in Paper Matches
Luminescing inclusions and fibers were located in paper matches by means of two lasers. The size, color, and intensity of luminescence varied from match to match. Paper matches could quickly be compared to each other. Forty-one match books were collected. They were illuminated with a 5-W argon laser operated in the broad band mode or a dye laser set at 593 nm. All matches were examined visually with optical equipment and some with infrared film. The argon laser revealed more luminescing inclusions, whereas the dye laser excited more fibers. Since only a small number of inclusions and fibers luminesced, they stood out from the mass of fibers constituting paper matches.