Investigation on space-domain difference based location method for φ-OTDR fiber-optic distributed disturbance sensor
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摘要: 针对-OTDR光纤分布式扰动传感器偏振衰落导致漏报的问题,提出了一种基于空间域差分的定位方法。在不增加光路器件的情况下,在空间域对探测光强进行差分处理,与现有时域定位方法相结合,通过在时域和空间域分别设置报警阈值,可以有效抑制偏振衰落导致的漏报。对提出的定位方法进行了实验验证,在空间分辨率为50 m、光纤长度为25.05 km的条件下进行多次实验测试,与现有单一时域定位方法相比,漏报率从18.5%降低到2%,报警准确率从76%提高至89%。该研究工作可以为优化和提高-OTDR光纤分布式扰动传感器在实际应用中的技术性能提供理论指导和技术参考。
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关键词:
- Φ-OTDR /
- 光纤分布式扰动传感器 /
- 空间域差分 /
- 漏报率 /
- 阈值
Abstract: In order to solve the problem of missing alarm due to the polarization induced fading (PIF) in -OTDR fiber-optic distributed disturbance sensor, a space-domain difference based location method was proposed and investigated. By determining the time-domain and space-domain thresholds, respectively, the detected optical intensity was processed by both of current time-domain and our proposed space-domain difference methods. Then, the missing alarm rate induced by PIF can be effectively reduced. The proposed location method was verified by experiment. By a long-term test in the case of space resolution of 50 m and fiber length of 25.05 km, compared with current single time-domain location method, the missing alarm rate is reduced to be 2% from 18.5%, and the accurate alarm rate is improved to be 89% from 76%. The proposed work in this paper can be the theoretical direction and technical reference for optimization and improving performances of -OTDR fiber-optic distributed disturbance sensor in practical applications. -
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