石墨烯涂覆微纳光纤气体传感机理与SF6分解组分SO2检测
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TM930

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湖北省自然科学基金资助项目(2021CFA025,2022CFB863)


Graphene coated micro/nano fiber gas sensing mechanism and SF6 decomposition component SO2 detection
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    摘要:

    准确有效监测气体绝缘设备(gas insulated equipment,GIE)内部SF6分解组分对设备故障诊断及状态评估具有重要意义。但现有外置检测方法受采样点和设备内组分扩散速率限制,难以精确掌握设备内组分浓度。为此,文中提出一种基于表面涂覆微纳光纤(micro/nano fiber,MNF)的SF6分解组分SO2检测方法,具有应用于GIE内置光纤传感在线监测的潜力。基于密度泛函理论分析石墨烯的光学气敏响应性能,搭建光纤环形腔衰荡(fiber-loop ring-down,FLRD)气体检测系统,开展典型SF6分解组分检测实验。仿真结果表明,石墨烯在吸附SO2气体分子后,光学特性变化较为显著,说明其对SO2具有良好的光学气敏响应性能。实验结果同样发现,该气体检测系统可实现常温下低浓度的SO2气体检测,在0~200 μL/L浓度范围内呈现良好的线性关系,SO2检测最大相对误差为4.89%,灵敏度为0.81 ns/(μL·L–1);而增加光纤放大器可以有效提升检测性能,系统灵敏度达到1.24 ns/(μL·L–1)。文中所提检测方法为GIE内置式光纤传感在线监测SF6分解组分提供了一种新的思路。

    Abstract:

    Accurate and effective monitoring of SF6 decomposition components inside the gas-insulated equipment (GIE) is crucial for the equipment fault diagnosis and condition assessment. However,the existing external detection methods are limited by sampling points and the diffusion rate of these components,making it difficult to accurately determine the concentration of the components. Therefore,in this paper,a method for detecting the SF6 decomposition component SO2 based on surface-coated micro/nano fibers (MNF) is proposed,which has the potential to be applied in built-in fiber optic sensing for GIE online monitoring. The optical gas-sensitive response performance of the graphene is analyzed based on the density functional theory. A fiber-loop ring-down (FLRD) gas detection system is constructed,and typical SF6 decomposition component detection experiments are carried out. The simulation results show that the optical properties of graphene change significantly after the adsorption of SO2 gas molecules,indicating its excellent optical gas-sensitive response performance to SO2. The experimental results also show that the gas detection system can detect the trace SO2 gas at room temperature. It shows a good linear relationship within the concentration range of 0~200 μL/L. The maximum error of SO2 detection is 4.89%,and the sensitivity is 0.81 ns/(μL·L–1). The detection performance is improved by adding an optical fiber amplifier,and the sensitivity of the system reaches 1.24 ns/(μL·L–1). The method proposed in this paper provides a new approach for online monitoring of SF6 decomposition components using GIE built-in optical fiber sensors.

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张引,陈奥,余雯雯,张国治,蔡逸杰,张晓星.石墨烯涂覆微纳光纤气体传感机理与SF6分解组分SO2检测[J].电力工程技术,2025,44(2):220-228

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  • 收稿日期:2024-08-01
  • 最后修改日期:2024-10-17
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  • 在线发布日期: 2025-04-03
  • 出版日期: 2025-03-28
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