Highly Sensitive Balloon-like Fiber Interferometer Based on Ethanol Coated for Temperature Measurement

Sensors (Basel, Switzerland) Pub Date : 2024-06-01 DOI:10.3390/s24113684

Xin Ding, Qiao Lin, Shen Liu, Lianzhen Zhang, Nan Chen, Yuping Zhang, Yiping Wang

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Abstract

A highly sensitivity balloon-like fiber interferometer based on ethanol coating is presented in this paper. The Mach–Zehnder interferometer is formed by bending a single-mode fiber to a balloon-like structure and nested in the Teflon tube. Then, an ethanol solution was filled into the tube of the balloon-like fiber interferometer by the capillary effect. Due to the high sensitivity of the refractive index (RI) of ethanol solutions to temperature, when the external temperature varies, the optical path difference changes. The change in temperature can be detected by the shift in the interference spectrum. Limited by the size of the balloon-like structure, three kinds of these structures with different sensitive lengths were prepared to select the best parameters. The sensitive lengths were 10, 15 and 20 mm, respectively, and the RI detection performance of each structure in 10~26% NaCl solutions was investigated experimentally. The results show that when the sensitive length is 20 mm, the RI sensitivity of the sensor is the highest, which is 212.88 nm/RIU. Ultimately, the sensitive length filled with ethanol is 20 mm. The experimental results show that the temperature sensitivity of the structure is 1.145 nm/°C in the range of 28.1 °C~35 °C, which is 10.3 times higher than that of an unfilled balloon-like structure (0.111 nm/°C). The system has the advantages of low cost and easy fabrication, which can potentially be used in high-precision temperature monitoring processes.

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基于乙醇涂层的高灵敏度气球状光纤干涉仪用于温度测量

本文介绍了一种基于乙醇涂层的高灵敏度气球状光纤干涉仪。马赫-泽恩德干涉仪是将单模光纤弯曲成气球状结构并嵌套在特氟隆管中形成的。然后，利用毛细管效应将乙醇溶液注入气球状光纤干涉仪的管中。由于乙醇溶液的折射率（RI）对温度非常敏感，当外部温度变化时，光路差也会发生变化。温度的变化可以通过干涉光谱的变化检测出来。受气球状结构尺寸的限制，我们制备了三种不同灵敏长度的气球状结构，以选择最佳参数。灵敏长度分别为 10 毫米、15 毫米和 20 毫米，实验研究了每种结构在 10%~26% NaCl 溶液中的 RI 检测性能。结果表明，当灵敏长度为 20 mm 时，传感器的 RI 灵敏度最高，为 212.88 nm/RIU。最终，注入乙醇的灵敏长度为 20 mm。实验结果表明，在 28.1 °C~35 °C 范围内，该结构的温度灵敏度为 1.145 nm/°C，是未填充气球状结构（0.111 nm/°C）的 10.3 倍。该系统具有成本低、易于制造等优点，可用于高精度温度监测过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Sensors (Basel, Switzerland)

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