Using Tapered Optical Fiber Sensors to Measure the Variation of Liquid's Refractive Index and Temperature

• Main Authors: Yen-Si Huang, 黃彥錫
• Other Authors: Fang-Wen Sheu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/96228244622900587191

碩士 === 國立嘉義大學 === 電子物理學系光電暨固態電子研究所 === 100 === In this study, we use an erbium-doped fiber amplifier as the broadband light source. The light is first launched into the entrance end of a fiber coupler. One output end of the fiber coupler is wound around the three paddles of the fiber polarization controller. Then the two output ends of the fiber coupler are butt joined with a tapered optical fiber. We use a power meter to observe the output light of the exit end of the fiber coupler, and then we adjust the fiber contact conditions to achieve a maximum output power. After completing the adjustment, we connect the exit end to an optical spectrum analyzer. Then we immerse the tapered optical fiber into a liquid and observe the influence of the variation of the liquid’s refractive index and temperature on the interference spectra. In addition to measuring the sensing properties of the tapered optical fiber, we also separate the fiber butt joints transversely or longitudinally to observe the spectral change. We also explore the influence on the sensitivity and the interference spectrum visibility of the fiber sensor when changing the angles of the fiber polarization controller. Finally, we set up the fiber polarization controller at different positions and change the circle numbers of the fiber wound around the three paddles to observe the resultant effects on this fiber sensing system.