A unique multiparameter sensor for distributed measurement of temperature and strain based on spontaneous Brillouin scattering in polyimide-coated optical fiber is proposed, which is an excellent candidate for the cross-sensitivity problem in conventional Brillouin sensing network. In the experimental section, the discrimination of strain and temperature is successfully demonstrated by analysing the unequal sensing coefficients of the Brillouin frequency shifts generated by different acoustic modes. The Brillouin frequency shifts of the main two peaks are successfully measured to discriminate the strain and temperature with an accuracy 19.68 με and 1.02°C in 2.5 km sensing range. The proposed distributed Brillouin optical fiber sensor allows simultaneous measurement of temperature and strain, thus opening a door for practical application such as oil explorations.

中文翻译：

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基于布里渊散射效应的聚酰亚胺涂层光纤中同时监测温度和应变的分布式光纤传感器

提出了一种独特的多参数传感器，该传感器基于聚酰亚胺涂层光纤中的自发布里渊散射，用于温度和应变的分布式测量，是解决常规布里渊传感网络中交叉敏感问题的极佳候选者。在实验部分，通过分析由不同声模产生的布里渊频移的不相等感测系数，成功地证明了应变和温度的区分。成功测量了两个主峰的布里渊频移，以区分应变和温度，精度为 19.68με在2.5 km的感应范围内为1.02°C。提出的分布式布里渊光纤传感器可以同时测量温度和应变，从而为石油勘探等实际应用打开了一扇门。