Infrared and Laser Engineering, Volume. 45, Issue 6, 622005(2016)
Investigation on space-domain difference based location method for φ-OTDR fiber-optic distributed disturbance sensor
In order to solve the problem of missing alarm due to the polarization induced fading(PIF) in φ-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 φ-OTDR fiber-optic distributed disturbance sensor in practical applications.
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Liang Sheng, Liu Tengfei, Sheng Xinzhi, Lou Shuqin, Zhang Ke. Investigation on space-domain difference based location method for φ-OTDR fiber-optic distributed disturbance sensor[J]. Infrared and Laser Engineering, 2016, 45(6): 622005
Category: 光通信与光传感
Received: Oct. 20, 2015
Accepted: Nov. 21, 2015
Published Online: Jul. 26, 2016
The Author Email: Sheng Liang (shliang@bjtu.edu.cn)