Temperature-Independent Micro-Refractometer Based on Cascaded In-Fiber Air Cavities With Strain-Error Correction
Temperature-Independent Micro-Refractometer Based on Cascaded In-Fiber Air Cavities With Strain-Error Correction
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DOI：
10.1109/jsen.2018.2868739
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发表时间：
2018-11
影响因子：
4.3
通讯作者：
L. Kong;Yan-Xin Zhang;Weigang Zhang;Zhe Li;Yunshan Zhang;Tieyi Yan;Pengcheng Geng
中科院分区：
文献类型：
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作者：
L. Kong;Yan-Xin Zhang;Weigang Zhang;Zhe Li;Yunshan Zhang;Tieyi Yan;Pengcheng Geng
本文提出了一种通过熔接单模光纤和填充甘油溶液的空心光纤（HCF）来制造光纤内空气腔的新技术。采用上述方法制作了由两个级联的椭球体光纤内气腔组成的光纤干涉仪。两个气腔分别是透射型多模干涉仪（MMI）的模式分离器和模式合成器。其间长度为$973~\mu \text{m}$的塌陷HCF可以作为MMI的折射率（RI）传感区域，与RI灵敏度相比，MMI的温度灵敏度可以忽略不计。由于对RI不敏感和对温度不敏感，采用最小壁厚$6.2~\mu \text{m}$的气腔作为反射式法布里-珀罗干涉仪来补偿MMI的应变。研究表明该传感器可以消除RI测量中温度和应变的影响。
We proposed a new fabrication technology of in-fiber air-cavity by splicing single-mode fiber and hollow core fiber (HCF) filled with the glycerol solution in this paper. A fiber-optic interferometer composed of two cascaded ellipsoidal in-fiber air cavities was fabricated by the above-mentioned method. The two air cavities are the mode splitter and the mode combiner of the transmission-type multimode interferometer (MMI), respectively. The collapsed HCF with the length of $973~\mu \text{m}$ between them can be used as the refractive index (RI) sensing area of the MMI, and the temperature sensitivity of the MMI can be ignored compared with the RI sensitivity. Owing to the RI insensitivity and temperature insensitivity, the air cavity with the minimum wall thickness of $6.2~\mu \text{m}$ is used as the reflection-type Fabry–Perot interferometer to compensate the strain of the MMI. Research shows that the sensor can eliminate the effects of temperature and strain in the measurement of RI.