High Sensitive Modal Interferometer for Temperature and Refractive Index Measurement
High Sensitive Modal Interferometer for Temperature and Refractive Index Measurement
复制标题
DOI：
10.1109/lpt.2015.2421349
复制
发表时间：
2015-06
影响因子：
2.6
通讯作者：
Yong Zhao;Lu Cai;Xue-gang Li
中科院分区：
文献类型：
--
作者：
Yong Zhao;Lu Cai;Xue-gang Li
提出并证明了一种新型灵敏度增强型光纤传感器，可基于反射式单模-多模-单模光纤结构测量液体温度和折射率 (RI)。传感部分通过热熔胶封装在一段毛细管内。由于热胶的热膨胀系数较高，温度升高会使管内的光纤弯曲。该测量是通过监测末端单模光纤中纤芯和包层模式之间模态干涉的光谱位移来实现的，该光纤经过精心雕刻以提供镜面界面。利用界面中发生的菲涅尔反射来测量液体的折射率和温度。最高灵敏度分别为 -92.6 pm/°C 和 -67.9 dB/RIU。该结构具有灵敏度高、可同时测量液体温度和折射率、操作方便、制造成本低等优点。
A novel sensitivity-enhanced optical fiber sensor has been presented and demonstrated to measure liquid temperature and refractive index (RI) based on the reflective single-mode-multimode-single-mode fiber structure. The sensing part is packaged in a segment of capillary tube by hot glue. Due to the high coefficient of thermal expansion of hot glue, the increasing temperature bends the fiber in the tube. The measurement is achieved via monitoring the spectral shift of the modal interference between the core and the cladding modes in the ended single-mode fiber, which is well carved to provide a mirror interface. The Fresnel reflection occurred in the interface is utilized to measure liquid RI and temperature. The highest sensitivity of -92.6 pm/°C and -67.9 dB/RIU are achieved, respectively. This structure has many advantages, such as high sensitivity, expectation for simultaneous measurement of liquid temperature and RI, convenient operation, and low cost of fabrication.