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| 光纤涂层用于光频域反射仪温度传感的仿真研究 |
| Simulation of optical fiber coating for OFDR temperature sensing |
| 投稿时间：2022-08-02 |
| DOI：10.3969/j.issn.1005-5630.2023.001.011 |
| 中文关键词: 光纤 涂层 光频域反射仪 温度灵敏度 |
| 英文关键词:fiber coating optical frequency domain reflectometer temperature sensitivity |
| 基金项目: |
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| 摘要点击次数: 37 |
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| 中文摘要: |
| 为了设计用于光频域反射仪（optical frequency domain reflectometer, OFDR）温度传感的涂层光纤，提升OFDR的温度灵敏度，增加其适用场景，从理论上分析了 1 层和 2 层涂层对单模光纤中瑞利频移温度灵敏度的影响并进行了仿真。考虑到外涂层的几何、热和机械性能，首先，用Lame解理论分析涂层对OFDR瑞利频移温度灵敏度的影响；其次，基于温度带来的光纤轴向应变关系以及光纤与 1 层涂层之间的力平衡，提出了仅含 1 层涂层的简化解；最后，针对建立的理论模型，对 1 层以及 2 层外涂层光纤的瑞利频移温度灵敏度进行了仿真。结果表明，瑞利频移温度灵敏度随着外涂层的杨氏模量、半径和热膨胀系数的增加而增加，而与涂层泊松比几乎无关。本研究结果将有助于提高OFDR在高温度灵敏度和低温场景中的应用。 |
| 英文摘要: |
| In order to design coated fiber for optical frequency domain reflectometer (OFDR) temperature sensing, improve the temperature sensitivity of OFDR and increase its applicable scenarios, this paper theoretically analyzes and simulates the effects of one and two layers of coating on the temperature sensitivity of Rayleigh frequency shift in single-mode fiber. Firstly, the effects are analyzed by using the Lame solution theory in term of the geometrical, thermal and mechanical properties of the coating. Secondly, a simplified solution with only one layer of coating is proposed based on the relationship of axial strain in optical fiber caused by temperature and the force balance between optical fiber and one layer of coating. Finally, the temperature sensitivity of Rayleigh frequency shift of the one-layer and two-layer coated optical fiber is simulated on the basis of the established theoretical model. The results show that the sensitivity increases with the increase of Young's modulus, radius and thermal expansion coefficient of the outer coating. However, it is almost independent of Poisson's ratio of the coating. The results of this paper could broaden the application of OFDR in high temperature sensitive and cryogenic temperature scenarios. |
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