Abstract
Fiber-optic fluorescence thermometer is a useful technique for temperature measurement in extraordinary conditions. In the fluorescence thermometer, the sensitivity and the accuracy of the measurement depend greatly on the properties of the sensor materials. Various phosphors, such as ruby, spine, alexandrite, and emerald have been reported for the sensor materials of the fluorescence thermometer.
In this paper, Cr doped garnet crystal (YAG), Cr doped spinel (MgAl2O4), rare earth element doped YAG crystals have been grown using floating zone (FZ) technique for a fluorescence thermometer application. Temperature dependence of peak intensity and peak intensity ratio of photoluminescence (PL) is evaluated using the crystals grown. Peak intensity of PL from the crystals decreases with temperature. Intensity ratio of PL peaks also varies with temperature. Cr doped garnet crystal (YAG), Cr doped spinel (MgAl2O4), rare earth element doped YAG crystals are potentially useful sensor material in fluorescence thermometer based on temperature dependences of PL intensity and PL intensity ratio.
