We study the dependence of Brillouin frequency shift (BFS) on water-absorption ratio in poly(methyl methacrylate)-based plastic optical fibers (POFs) to clarify the effect of the humidity on the POF-based Brillouin sensors. The BFS decreases monotonically as the water-absorption ratio increases, probably because of the decrease in the Young's modulus. At the same water-absorption ratio, the BFS change basically becomes larger with increasing temperature. The maximal BFS changes (absolute values) at 40, 60, and 80 °C are 158, 285, and 510 MHz (corresponding to the temperature changes of approximately 9, 16, and 30 °C), respectively. Therefore, some countermeasure against humidity is indispensable in implementing strain/temperature sensors based on Brillouin scattering in POFs especially at higher temperature. On the other hand, Brillouin-based distributed humidity sensors can be developed by exploiting the BFS dependence on water absorption in POFs.
|出版ステータス||Published - 2015|
|イベント||24th International Conference on Plastic Optical Fibers, POF 2015 - Nuremberg, Germany|
継続期間: 2015 9 22 → 2015 9 24
|Other||24th International Conference on Plastic Optical Fibers, POF 2015|
|Period||15/9/22 → 15/9/24|
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