Infrared fluorescing optical signature agent for real time change detection

摘要

A method of detecting changes in a scene comprising placing a fluorescent and/or phosphorescent compound in the scene and monitoring for elimination or change in position of the phosphorescent compound. Also a liquid fluorescent and/or phosphorescent material comprising one or more compounds that are fluorescent and/or phosphorescent in infrared frequencies and substantially not fluorescent and/or phosphorescent in visible light frequencies and a carrier.