材料科学
法布里-珀罗干涉仪
相对湿度
干涉测量
光学
光纤
折射率
波长
涂层
单模光纤
光纤传感器
光电子学
制作
反射(计算机编程)
温度测量
纤维
复合材料
物理
病理
热力学
医学
量子力学
程序设计语言
替代医学
计算机科学
作者
Shengnan Wu,Guofeng Yan,Lian Zhang,Xiang Chen,Bin Zhou,Sailing He
标识
DOI:10.1016/j.snb.2015.11.015
摘要
A fiber-optic open-cavity Fabry-Perot (FP) interferometer (FPI) with polyvinyl alcohol (PVA) coating is proposed and experimentally demonstrated for simultaneous measurement of relative humidity (RH) and temperature. The FPI consists of an etched side-hole fiber (SHF) sandwiched in between two leading single-mode-fibers. The PVA film is plated on the fiber surface functioning as a humidity-to-refractive index (RI) transducer. Theoretical analysis details the RH and temperature influence on the spectral fringes of the FPI. Experimental results confirms and show that, the reflection loss of the FPI nonlinearly decreases more than 15 dB when the RH increases from 30%RH to 90%RH with a highest sensitivity of −1.2 dB/%RH, while the dip wavelength of the spectral fringe exhibits linear RH and temperature sensitivities of −23.1 pm/%RH and −6.14 pm/°C, respectively. Thus, by monitoring the reflection and wavelength of the interference dip, the proposed sensor enables accurate simultaneous measurement of RH and temperature. A fast and reversible time response has also been demonstrated. Such excellent sensing performance with compactness, ease of fabrication makes our sensing structure a highly promising candidate for RH and temperature monitoring applications.
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