基于Fabry-Perot微腔结构的超低温环境光纤应变传感特性研究
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(1.北京信息科技大学 光电测试技术及仪器教育部重点实验室,北京 100192;2.北京信息科技大学 光纤传感与系统北京实验室,北京 100192)

作者简介:

何 巍 (1986-),男,博士,教授,博士生导师,主要从事光纤传感系统方面的研究。

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TN253

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国家自然科学基金(52105540)和河南省市场监督管理局科技计划项目(2022SJ41) 资助项目


Research on ultra-low temperature fiber strain sensing characteristics based on Fabry-Perot micro-cavity structure
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(1.Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument,Beijing Information Science and Technology University,Beijing 100192,Beijing 100192,China;2.Beijing Laboratory of Optical Fiber Sensing and Systems,Beijing Information Science and Technology University,Beijing 100192,China)

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    摘要:

    本文提出了一种基于氢氟酸(hydrofluoric acid, HF)化学腐蚀法制备光纤法布里-珀罗(Fabry-Perot,F-P)微腔结构的超低温液氮环境光纤应变传感特性研究。采用浓度为20%的HF溶液腐蚀单模光纤端面15 min得到凹槽结构,将腐蚀端与另一端面切平的单模光纤进行熔接形成F-P微腔,F-P反射谱对比度 为7.98 dB,自由光谱范围(free spectrum range,FSR) 为17.8 nm。实验中,将光纤F-P传感器粘贴在等强度梁上并放置于液氮(-196 ℃)环境,应变测试范围为70—630 με,在施加应变过程中,F-P反射谱波长向短波方向漂移4.21 nm,灵敏度为-7.17 pm/με,拟合度为99.928% ;在卸载应变过程中,F-P反射谱波长向长波方向漂移4.33 nm,灵敏度为7.34 pm/με,拟合度为99.923%。通过对超低温应变响应特性实验进行滞后性分析得知施加-卸载应变波长漂移最大偏差为0.17 nm,证明所设计的传感器具有稳定性与可靠性。

    Abstract:

    In this paper,a strain sensing characteristic of fiber Fabry-Perot (F-P) micro-cavity fabricated by hydrofluoric acid (HF) chemical etching method in ultra-low temperature liquid nitrogen environment was presented.The groove structure was obtained by corroding the end face of the single-mode fiber with a concentration of 20% HF solution for 15 min,and the corroded end was welded with the single-mode fiber with the other end face cutting flat to form flat an F-P micro-cavity.The F-P reflection spectrum contrast was 7.98 dB and the free spectrum range (FSR) was 17.8 nm.The fiber F-P sensor was pasted on the equal strength girder and placed in liquid nitrogen (-196 ℃) environment,and the strain range was 70—630 με in the experiment.The wavelength of F-P reflection spectrum drifted 4.21 nm in the short-wave direction,the strain sensitivity is -7.17 pm/με and the R-squared is 99.928% during the applied strain.The wavelength of F-P reflection spectrum drifted 4.33 nm in the long-wave direction,the strain sensitivity is 7.34 pm/με and the R-squared is 99.923% during the unloading strain.Through the hysteresis analysis of the ultra-low temperature strain response characteristic experiment,it is found that the maximum deviation of applied-unloading strain wavelength drift is 0.17 nm,which proves that the designed sensor has stability and reliability.

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陈佳莹,李邵德,何巍.基于Fabry-Perot微腔结构的超低温环境光纤应变传感特性研究[J].光电子激光,2025,(4):344~351

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  • 收稿日期:2023-10-31
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  • 在线发布日期: 2025-03-05
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