[1] Yuan Z B. Status and administrative measures for the leakage of urban drinking water network in China[J]. Municipal Admistration and Tetechnology, 6, 82-84(2004).

[2] Zhang T Q, Shao Y. Monitoring and control technology and application of leakage in urban water supply pipe network[J]. Chinese Journal of Environmental Management, 9, 109-110(2017).

[3] E S L. Distributed optical fiber sensing system used in well logging and pipeline leak detection[J]. OME Information, 28, 62-66(2011).

[4] He C F, Hang L J, Wu B. Application of distributed optical fiber sensing technique in pipeline leak detection[J]. Transducer and Microsystem Technologies, 25, 8-11(2006).

[5] Zheng Y J, Wang Z D, Yi S X. Optical fiber pre-warning system for safety of oil pipelines based on OTDR[J]. Control and Instruments in Chemical Industry, 35, 45-49(2008).

[6] Mahmoud S S, Visagathilagar Y, Katsifolis J. Nuisance alarm suppression techniques for fibre-optic intrusion detection systems[C]. Third Asia Pacific Optical Sensors Conference, 8351, 83513J(2012).

[7] Mahmoud S S, Visagathilagar Y, Katsifolis J. Real-time distributed fiber optic sensor for security systems: Performance, event classification and nuisance mitigation[J]. Photonic Sensors, 2, 225-236(2012). http://www.opticsjournal.net/Articles/Abstract?aid=OJ130416000212KhNjQm

[8] Hang L J, He C F, Wu B. A new pipeline leakage detection system based on linear optical fiber Sagnac interferometer and its location technology[J]. Chinese Journal of Lasers, 34, 820-824(2007).

[9] Pei F J, Yang D, Liu H Y. Design and implementation of ship pipeline leakage monitor based on optical fiber interferometer[J]. Journal of Beijing University of Technology, 41, 984-990(2015).

[10] Li X Y, Wu H J, Peng Z P et al. A novel time sequence singular spectrum analysis method for Φ-OTDR disturbance detection system[J]. Acta Photonica Sinica, 43, 0428001(2014).

[11] Sha Z, Yang Y, Feng H et al[J]. The urban watersupply pipeline leakage monitoring technique based on phase-sensitive OTDR China Instrumentation, 2016, 72-76.

[12] Feng K B, Song M P, Xia Q L et al. High-resolution distributed optical-fiber sensing technology based on direct-detecting coherent optical time-domain reflectometer[J]. Acta Optica Sinica, 36, 0106002(2016).

[13] Ye Q. PanZ Q, Wang Z Y, et al. Progress of research and applications of phase-sensitive optical time domain reflectometry[J]. Chinese Journal of Lasers, 44, 0600001(2017).

[14] Martins H F, Martín-López S, Corredera P et al. Phase-sensitive optical time domain reflectometer assisted by first-order Raman amplification for distributed vibration sensing over 100 km[J]. Journal of Lightwave Technology, 32, 1510-1518(2014). http://ieeexplore.ieee.org/document/6748011/

[15] Soto M A, Ramírez J A, Thévenaz L. Intensifying the response of distributed optical fibre sensors using 2D and 3D image restoration[J]. Nature Communications, 7, 10870(2016). http://europepmc.org/articles/PMC4773526/

[16] Masoudi A, Belal M, Newson T P. Adistributed optical fibre dynamic strain sensor based on phase-OTDR[J]. Measurement Science and Technology, 24, 085204(2013). http://www.ingentaconnect.com/content/iop/mst/2013/00000024/00000008/art085204

[17] Alekseev A E, Vdovenko V S, Gorshkov B G et al. A phase-sensitive optical time-domain reflectometer with dual-pulse phase modulated probe signal[J]. Laser Physics, 24, 115106(2014). http://adsabs.harvard.edu/abs/2015LaPhy..25f5101A

[18] Alekseev A E, Vdovenko V S, Gorshkov B G et al. A phase-sensitive optical time-domain reflectometer with dual-pulse diverse frequency probe signal[J]. Laser Physics, 25, 065101(2015). http://adsabs.harvard.edu/abs/2015LaPhy..25f5101A

[19] Sifta R, Munster P, Sysel P et al. Distributed fiber-optic sensor for detection and localization of acoustic vibrations[J]. Metrology & Measurement Systems, 22, 111-118(2015). http://www.ingentaconnect.com/content/doaj/23001941/2015/00000022/00000001/art00010

[20] Huang Y, Wang Q, Yang Q H et al. Experimental analysis of distributed fiber optic underwater natural gas pipeline leakage detection system[J]. Laser & Optoelectronics Progress, 51, 110602(2014).

[21] Zhou Y, Jin S J, Zhang Y C et al. Distributed optical fiber sensing technology for pipeline leakage detection and location[J]. Acta Petrolei Sinica, 27, 121-124(2006).

[22] Wang Y, Wu R D, Dong Q et al. Φ-OTDR technology for destruction alarm of gas pipeline[J]. Coal Technology, 35, 225-226(2016).

[23] Han L J, Wang Q, Fan X W et al. Underwater gas pipeline leakage diagnostic method by distributed optical fiber sensor based on SPE[J]. Laser & Optoelectronics Progress, 53, 052801(2016).

[24] Mu L B, Wu Y F, Yao J. Study on multiple-point localization problem of distributed fiber-optic vibration-sensing systems[J]. Transducer and Microsystem Technologies, 29, 42-45(2010).

[25] Wang D W, Feng H, Yang Y et al. Study on leakage identification method of water supply pipeline based on Ф-OTDR optical fiber sensing technology[J]. Chinese Journal of Scientific Instrument, 38, 830-837(2017).