Evaluation of Cr-doped yttrium aluminum garnet crystals for hybrid fiber-optic thermometer application

• DOI: 10.1016/j.measurement.2005.10.004
• Publication Date: 2005-11-29T12:42:00Z
• Authors: H. Aizawa; T. Katsumata; Y. Kiyokawa; T. Nishikawa; T. Sasagawa; S. Komuro; T. Morikawa; H. Ishizawa; E. Toba
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Abstract Rare-earth aluminate crystals have chemical and thermal stability, which are advantage for the sensor materials of a fiber-optic fluorescence thermometer. Among many rare-earth aluminate crystals, rare-earth garnet, Y 3 Al 5 O 12 , doped with Cr 2 O 3 (Cr-doped YAG), is found to be useful as the sensor materials for fluorescence thermometer. Fluorescence lifetime of Cr-doped YAG crystal decreases from 2 ms to 0.1 ms as the temperature increases from 273 K to 900 K. Moreover, thermal radiation from Cr-doped YAG crystal can be observed from 800 K using Si photo-detector. The fiber-optic thermometer with extremely wide temperature range is considered to be produced by the combination of the temperature dependence of the fluorescence lifetime and the thermal radiation from Cr-doped YAG crystal.