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Low modulus polymer packaged optical fiber sensor for macrocrack monitoring in ice structures of cold regions

机译：低模量聚合物封装光纤传感器，用于寒冷地区冰结构中的大裂缝监测

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摘要

Ice structures provide load-bearing capability for energy exploitation and transportation in cold regions. Meanwhile, staff and facilities take a risk due to large amounts of distributed macrocracks in ice roads, ice bridges, and ice platforms. It is critical to monitor macrocracks for detecting and understanding the fracture process under such a harsh environment. Aiming to obtain real-time, long-term, and quantitative crack opening information for ice structures, this paper presents a feasibility study on monitoring macrocracks with a low modulus polymer packaged optical fiber sensor. Brillouin optical time-domain analysis-based sensing technology is utilized for the distributed strain measurement. According to in situ monitoring requirements, a type of silicone rubber material with appropriate mechanical properties is selected to fabricate the sensor. On this basis, a strain transfer analysis on the packaged and embedded sensor is carried out to derive the relation between the optical measurement and the increment of the crack width. The prototypes have been evaluated by demonstration tests on a tensile device and an ice road model. The experimental results show the sensor can survive in a cold environment and under the large strain resulting from the macrocrack opening. These measured data agree well with the linear calibration. The macrocracks opening in large-scale ice structures can be characterized based on the optical sensor.
机译：冰结构为寒冷地区的能源开发和运输提供承重能力。同时，由于在冰路，冰桥和冰平台中分布着大量的宏观裂缝，因此人员和设施要承担风险。监视宏观裂缝对于检测和理解这种恶劣环境下的断裂过程至关重要。为了获得实时，长期和定量的冰结构裂缝开度信息，本文提出了用低模量聚合物封装的光纤传感器监测宏观裂缝的可行性研究。基于布里渊光学时域分析的传感技术用于分布式应变测量。根据现场监测要求，选择一种具有适当机械性能的硅橡胶材料来制造传感器。在此基础上，对封装传感器进行了应变传递分析，得出了光学测量值与裂纹宽度增量之间的关系。通过在拉伸设备和冰道模型上的演示测试对原型进行了评估。实验结果表明，该传感器可以在寒冷的环境中生存，并且可以承受因大裂纹打开而产生的较大应变。这些测量数据与线性校准非常吻合。大型冰结构中的大裂缝开口可以基于光学传感器进行表征。

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