Strain and temperature sensor based on fiber Bragg grating cascaded bi-tapered four-core fiber Mach-Zehnder interferometer
Strain and temperature sensor based on fiber Bragg grating cascaded bi-tapered four-core fiber Mach-Zehnder interferometer
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DOI：
10.1088/1361-6463/aba974
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发表时间：
2020-11-11
影响因子：
3.4
通讯作者：
Yue, Zizheng
中科院分区：
文献类型：
--
作者：
Feng, Wenlin;Yang, Xiaozhan;Yue, Zizheng
提出并研制了一种基于光纤布拉格光栅（FBG）级联双锥四芯光纤（FCF）马赫-曾德尔干涉（MZI）的新型应变温度传感器。这两个光纤锥分别作为分束器和耦合器，可以产生干涉现象，从而获得20 dB以上的高干涉消光比。分别选择透射光谱中1562 nm处的衰减峰和1550 nm处的FBG中心波长来代表MZI和FBG作为监测波长。结果表明，MZI对应变和温度的灵敏度分别为-1.83 pm μ C ~（-1）和46.93 pm C ~（-1），FBG对应变和温度的灵敏度分别为1.26 pm μ C ~（-1）和10.58 pm C ~（-1）。FBG和MZI都表现出对折射率的不敏感性。该传感器具有良好的线性度，可用于应变和温度的同时测量。
A novel strain and temperature sensor based on the fiber Bragg grating (FBG) cascaded two-tapered four-core fiber (FCF) Mach-Zehnder interference (MZI) is proposed and fabricated. The two optical fiber tapers, acting respectively as a beam splitter and a coupler, are able to produce interference phenomena, so the high interference extinction ratio (above 20 dB) can be obtained. The attenuation peak at 1562 nm and the FBG center wavelength at 1550 nm in the transmission spectra are, respectively, selected to represent MZI and FBG as the monitoring wavelengths. The results indicate that the sensitivities of MZI to strain and temperature are -1.83 pm mu epsilon(-1)and 46.93 pm C-1, respectively, and those of FBG to strain and temperature are 1.26 pm mu epsilon(-1)and 10.58 pm C-1, respectively. Both the FBG and MZI exhibit insensitivity to the refractive index. The cascaded sensor has good linearity and is applied to measure the strain and temperature simultaneously.