The Improvement of Temperature Sensitivity by Eliminating the Thermal Stress at the Interface of Fiber Bragg Gratings

IF 0.4 4区 工程技术 Q4 ENGINEERING, MULTIDISCIPLINARY
Sixiang Liang, Zhan Wang, Pengfei Wang, Huanhuan Liu, Xiaohong Sun
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Abstract

This article uses polydimethylsiloxane (PDMS) to package an improved fiber Bragg grating (FBG) temperature sensor. Unlike the structure of PDMS completely enveloping fiber gratings, we utilize microfluidic processing technology to construct a microchannel with a diameter of 150 μm in the area of the fiber gratings. It eliminates the thermal stress on the fiber grating in the radial direction. Through the force analysis of the fiber gratings in the packaged sensor, it can be found that eliminating the radial thermal stress is conducive to improving the axial coefficient of thermal expansion of the fiber gratings. The temperature sensing characteristics of this structure are verified by simulation and experiment. Both theoretical and experimental results have shown that this structure can effectively improve the temperature sensitivity of the sensor. In the experiment, the temperature sensitivity of the packaged sensor is 3.5 times higher than that of the standard fiber gratings. The temperature sensitivity of the sensor is 37.6 pm/°C. It is simple to manufacture, does not pollute the environment, and can accurately monitor the temperature of the complex environment. Therefore, it is an ideal model for temperature monitoring in complex environments such as the ocean and mine.

Abstract Image

通过消除光纤布拉格光栅界面的热应力提高温度灵敏度
本文使用聚二甲基硅氧烷(PDMS)封装改进型光纤布拉格光栅(FBG)温度传感器。与 PDMS 完全包裹光纤光栅的结构不同,我们利用微流体加工技术在光纤光栅区域构建了一个直径为 150 μm 的微通道。它消除了光纤光栅在径向上的热应力。通过对封装传感器中的光纤光栅进行受力分析,可以发现消除径向热应力有利于提高光纤光栅的轴向热膨胀系数。模拟和实验验证了这种结构的温度传感特性。理论和实验结果都表明,这种结构能有效提高传感器的温度灵敏度。在实验中,封装传感器的温度灵敏度是标准光纤光栅的 3.5 倍。传感器的温度灵敏度为 37.6 pm/°C。它制造简单,不污染环境,能准确监测复杂环境的温度。因此,它是海洋和矿井等复杂环境温度监测的理想模型。
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来源期刊
Instruments and Experimental Techniques
Instruments and Experimental Techniques 工程技术-工程:综合
CiteScore
1.20
自引率
33.30%
发文量
113
审稿时长
4-8 weeks
期刊介绍: Instruments and Experimental Techniques is an international peer reviewed journal that publishes reviews describing advanced methods for physical measurements and techniques and original articles that present techniques for physical measurements, principles of operation, design, methods of application, and analysis of the operation of physical instruments used in all fields of experimental physics and when conducting measurements using physical methods and instruments in astronomy, natural sciences, chemistry, biology, medicine, and ecology.
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