Opt Lett. 2022 Aug 1;47(15):3708-3711. doi: 10.1364/OL.465403.
A fiber sensor based on a silica capillary in a balloon-like shape for simultaneous measurement of displacement and temperature is proposed and experimentally demonstrated. The sensor is fabricated by splicing a segment of a hollow-core fiber between two single-mode fibers (SMF) and by creating a balloon shape with the capillary at the top-center position. The SMF-capillary-SMF configuration excites an antiresonant (AR) guidance, and the balloon shape enhances the Mach-Zehnder interferometer (MZI). Experimental results show that, for a balloon length of 4.0 cm and a capillary length of 1.2 cm, the AR is insensitive to displacement and its sensitivity to temperature is 14.3 pm/°C, while the MZI has a sensitivity to displacement of 1.68 nm/mm in the range between 0 and 5 mm and a sensitivity to temperature of 28.6 pm/°C, twice the value of the AR. The proposed fiber sensor has only one sensing element in one configuration, which makes it simple to fabricate as well as low cost.
提出并实验演示了一种基于 balloon-like 形状的二氧化硅毛细管的光纤传感器，用于同时测量位移和温度。该传感器通过在两段单模光纤（SMF）之间拼接一段空芯光纤，并在顶部中心位置使用毛细管制造 balloon 形状来制造。SMF-毛细管-SMF 配置激发反谐振（AR）引导，而 balloon 形状增强了马赫-曾德尔干涉仪（MZI）。实验结果表明，对于 balloon 长度为 4.0 cm 和毛细管长度为 1.2 cm 的情况，AR 对位移不敏感，其对温度的灵敏度为 14.3 pm/°C，而 MZI 在 0 到 5 mm 的范围内对位移的灵敏度为 1.68 nm/mm，对温度的灵敏度为 28.6 pm/°C，是 AR 的两倍。所提出的光纤传感器在一种配置中只有一个传感元件，这使得它制造简单且成本低廉。
