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Temperature Measurement and Damage Detection in Concrete Beams Exposed to Fire Using PPP-BOTDA Based Fiber Optic Sensors

机译:使用基于PPP-BOTDA的光纤传感器对着火的混凝土梁进行温度测量和损伤检测

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摘要

In this study, distributed fiber optic sensors based on pulse pre-pump Brillouin optical time domain analysis (PPP-BODTA) are characterized and deployed to measure spatially-distributed temperatures in reinforced concrete specimens exposed to fire. Four beams were tested to failure in a natural gas fueled compartment fire, each instrumented with one fused silica, single-mode optical fiber as a distributed sensor and four thermocouples. Prior to concrete cracking, the distributed temperature was validated at locations of the thermocouples by a relative difference of less than 9 %. The cracks in concrete can be identified as sharp peaks in the temperature distribution since the cracks are locally filled with hot air. Concrete cracking did not affect the sensitivity of the distributed sensor but concrete spalling broke the optical fiber loop required for PPP-BOTDA measurements.
机译:在这项研究中,基于脉冲预泵布里渊(Brillouin)光学时域分析(PPP-BODTA)的分布式光纤传感器经过表征和部署,可用于测量暴露于火中的钢筋混凝土标本的空间分布温度。测试了四根光束,以天然气为燃料的舱室失火,每根光束都装有一根熔融石英,单模光纤作为分布式传感器和四个热电偶。在混凝土开裂之前,通过小于9%的相对差验证了热电偶位置的分布温度。由于裂缝局部充满了热空气,因此可以将混凝土中的裂缝识别为温度分布的尖峰。混凝土开裂不会影响分布式传感器的灵敏度,但混凝土剥落会破坏PPP-BOTDA测量所需的光纤环路。

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