Fiber-optic Thermometer Using Afterglow Phosphorescence from Long Duration Phosphor

A fiber-optic thermometer is developed based on the temperature dependence of the afterglow phosphorescence intensity which is dominated by the thermal excitation of trapped carriers using long duration phosphor, The intensity of afterglow phosphorescence from the long phosphorescent sensor head increases greatly and linearly with the temperature ranging from 270 to 320 K with the temperature coefficient of 1.3 % K −1 . The long phosphorescent materials are potentially useful phosphors for the sensitive sensor head in fiber-optic thermometers.