超细纤维
干涉测量
重复性
聚二甲基硅氧烷
温度测量
压力传感器
材料科学
光纤
压力测量
制作
光学
灵敏度(控制系统)
热稳定性
光纤传感器
物理
纤维
电子工程
复合材料
热力学
化学
机械工程
工程类
医学
病理
量子力学
有机化学
色谱法
替代医学
作者
Yun-Fei Hou,Jing Wang,Xin Wang,Yipeng Liao,Lei Yang,Enlin Cai,Shanshan Wang
标识
DOI:10.1109/jlt.2020.3012716
摘要
Simultaneous measurement of pressure and temperature in seawater is realized based on polydimethylsiloxane (PDMS) sealed microfiber Mach-Zehnder interferometer (MZI). Benefitting from the high thermal-optic coefficient and large elasticity of PDMS, high sensitivity and robust structure can be obtained. In theoretical modeling, significant enhanced pressure response in fiber is observed clearly, and pressure or temperature sensitivities are calculated theoretically. In experiment, PDMS sealed MZI is fabricated by a two-step sealing method. Using this MZI, sensitivity of 13.31 nm/MPa for pressure sensing and -7.41 nm/°C for temperature sensing are demonstrated, respectively, which are about one order higher than bare fiber MZIs (without PDMS sealing). To verify the accuracy of sensor, several tests under arbitrarily pressure and temperature are performed with average errors of 4.38% and 1.44%, respectively. In addition, effects of encapsulation on avoiding cross-sensitivity with salinity, PDMS thickness on pressure sensitivity, response time, repeatability, time stability, and polarization of the sensor are also evaluated by experiment. Sensors demonstrated here show advantages of low cost, simple fabrication, robust and compact structure, high-pressure resistance, high sensitivity, good repeatability, and long-term stability.
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