Fiber-optic distributed sensor based on phase-sensitive OTDR and wavelet packet transform for multiple disturbances location

被引：50
作者：
Li, Qin [1 ]
Zhang, Chunxi [1 ]
Li, Chuansheng [1 ]
机构：
[1] Beihang Univ, Sch Instrument Sci & Optoelect Engn, Beijing 100191, Peoples R China
来源：
OPTIK | 2014年 / 125卷 / 24期
关键词：
Fiber-optic distributed disturbance sensor; Phase-sensitive optical time-domain; reflectometry (OTDR); Laser-frequency drift; Multiple disturbances; LONG PERIMETERS; SYSTEM;
D O I：
10.1016/j.ijleo.2014.07.128
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A novel location scheme based on the wavelet packet transform (WPT) for the phase-sensitive optical time-domain reflectometry (OTDR) is proposed. The wavelet packet energy of the backscattered signal at a time interval over the sensing fiber is provided to discriminate the disturbances regions from other regions. It is insensitive to the frequency drift of the laser. The simultaneous measurement of two disturbances at 5 km and 7 km positions is achieved by the location technique based on the WPT over a 9 km monitored length with a 50m spatial resolution even when a laser with a frequency drift rate of 230 MHz/min is utilized. During 100 times experiments the false alarm rate is only 2% and the maximum location error is 150m. 2014 Elsevier GmbH. All rights reserved.
引用
收藏
页码：7235 / 7238
页数：4
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