A temperature-dependence coefficient of Brillouin frequency shift (BFS) in plastic optical fibers (POFs) is known to start decreasing drastically at a certain "Brillouin critical temperature". Here, we study the relationship between the critical temperature and the core glass transition temperature (Tg) using five poly(2,2,2-trifluoroethyl methacrylate) samples with different Tg values. In all the samples, the BFS is found to start decreasing abruptly at a temperature lower than Tg by approximately 10 °C, which agrees well with the phase transition starting temperature measured by using a differential scanning calorimeter. Thus, the critical temperature in POFs is shown to be adjustable by controlling Tg, leading to the possible development of distributed temperature sensors with ultra-high sensitivity.
|出版ステータス||Published - 2014|
|イベント||23rd International Conference on Plastic Optical Fibers, POF 2014 - Hiyoshi, Yokohama, Japan|
継続期間: 2014 10月 8 → 2014 10月 10
|Other||23rd International Conference on Plastic Optical Fibers, POF 2014|
|Period||14/10/8 → 14/10/10|
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