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Fiber-optic distributed sensor based on phase-sensitive OTDR and wavelet packet transform for multiple disturbances location
Institution:1. School of Engineering, University of Southampton, SO171BJ, UK;2. Optoelectronics Research Centre, University of Southampton, SO171BJ, UK;3. Department of Civil, Environmental and Mechanical Engineering, University of Trento, Italy;1. Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, PR China;2. Department of Computer, North China Electric Power University, Baoding 071003, PR China;1. College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China;2. The Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, Nanjing 210093, China;3. Nanjing University of Science and Technology, 210094, China;4. School of Electronics and Engineering, Nanjing XiaoZhuang University, Nanjing 211171, China;5. Beijing University of Posts and Telecommunications, Beijing 100876, China;1. Department of Opto-Electronics Engineering, School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China;2. Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute of Shandong Academy of Sciences, Jinan, Shandong 250014, China;3. School of Electrical Engineering & Telecommunications, The University of New South Wales, NSW 2052, Australia
Abstract: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 50 m 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 150 m.
Keywords:Fiber-optic distributed disturbance sensor  Phase-sensitive optical time-domain reflectometry (OTDR)  Laser-frequency drift  Multiple disturbances
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