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针对目前青藏高原多年冻土区高速公路工程构筑物监测急需解决的问题,提出了低温条件下长距离监测的分布式布里渊光纤监测传感技术方案,并使用差分脉冲布里渊光时域分析(DPPBOTDA)技术在单模光纤中开展了分布式光纤传感试验研究。使用120ns/100ns和110ns/100ns脉冲对组合在50km光纤传感长度上进行试验,研究2种脉冲对组合对应的布里渊增益谱、布里渊频移和信号的信噪比,探索了低温条件下长距离监测的分布式布里渊光纤技术空间分辨率和测量精度的关系。结果表明:试验得到的光纤传感系统具有50km传感距离,1m空间分辨率和6.552×10-6应变传感精度,弥补了中长距离传感范围研究的空白。
In view of the urgent need to be solved for the monitoring of expressway engineering structures in the permafrost region of the Qinghai-Tibet Plateau, a distributed Brillouin fiber monitoring sensing scheme for long-distance monitoring at low temperature is proposed. Using the differential pulse Brillouin optical time-domain analysis (DPPBOTDA) technology in single-mode optical fiber distributed optical fiber sensing experiment. The combinations of 120 ns / 100 ns and 110 ns / 100 ns pulses were tested on a 50 km fiber sensing length. The Brillouin gain, Brillouin frequency shift and signal-to-noise ratio of the two pulse pairs were studied. The effects of low temperature Relationship between Spatial Resolution and Measurement Accuracy of Distributed Brillouin Optical Fiber Technology for Long Distance Monitoring. The results show that the experimental optical fiber sensing system has 50km sensing distance, 1m spatial resolution and 6.552 × 10-6 strain sensing accuracy, which makes up the blank of long-range sensing range research.