[2] HARTOG A H.A distributed temperature sensor based on liquid-core optical fiber［J］.Journal of Light-wave Technology,1983,1(3): 498-509.

[3] BOIARSKI A A,PILATE G,FINK T,et al.Temperature measurements in power plant equipment using distributed fiber optic sensing［J］.IEEE Transactions on Power Delivery,1995,10(4): 1771-1778.

[4] DUBANIEWICZ T H,CHILTON J E,DOBROSKI H.Fiber optics for atmospheric mine monitoring［J］.IEEE Transactions on Industry Applications,1993,29(4): 749-754.

[5] HEALEY P,HENSEL P.Optical time domain reflectometry by photon counting［J］.Electronics Letters,1980,16(16): 631-633.

[6] GIFFORD D K,SOLLER B J,WOLFE M S,et al.Distributed fiber-optic temperature sensing using Rayleigh backscatter［C］∥ECOC 2005.31st European Conference on Optical Communication.［s.l.］: IET,2005: 511-512.

[7] SOLLER B J,GIFFORD D K,WOLFE M S,et al.Measurement of localized heating in fiber optic component with millimeter spatial resolution［C］∥Optical Fiber Communication Conference.Anaheim,CA: IEEE,2006.

[8] SANG A K,FROGGATT M E,GIFFORD D K,et al.One centimeter spatial resolution temperature measurements from 25 to 850 ℃ using Rayleigh scatter in gold coated fiber［C］∥Quantum Electronics and Laser Science Conference.Baltimore,MD,USA: IEEE,2007: 1-2.

[9] SANG A K,FROGGATT M E,GIFFORD D K,et al.One centimeter spatial resolution temperature measurements in a nuclear reactor using Rayleigh scatter in optical fiber［J］.IEEE Sensors Journal,2008,8(7): 1375-1380.

[10] PALMIERI L,GALTAROSSA A.Reflectometric fiber optic sensor for distributed measurement of intense magneto-static fields［C］∥2011 IEEE Sensors.Limerick: IEEE,2011: 117-120.

[11] ZHU T,XIAO X H,HE Q,et al.Enhancement of SNR and spatial resolution in φ-OTDR system by using Two-Dimensional edge detection method［J］.Journal of Lightwave Technology,2013,31(17): 2851-2856.

[21] KURASHIMA T,TATEDA M,HORIGOCHI T,et al.Performance improvement of a combined OTDR for distributed strain and loss measurement by randomizing the reference light polarization state［J］.IEEE Photonics Technology Letters,1997,9(3): 360-362.

[22] KOYAMADA Y,IMAHAMA M,KUBOTA K,et al.Fiber optic distributed strain and temperature sensing with very high measurand resolution over long range using coherent OTDR［J］.Journal of Lightwave Technology,2009,27(9): 1142-1146.

[23] LI Y Q,LI R W,YANG Z.Coherent OTDR for measuring distributed temperature and strain with high resolution in km-long fiber［C］∥2010 International Conference on.Intelligent Computation Technology and Automation,Changsha,China IEEE,2010: 962-965.

[24] YANG Z,SHI P X,LI Y Q.Research on COTDR for measuring distributed temperature and strain［C］∥2011 Second International Conference on.Mechanic Automation and Control Engineering(MACE).Hohhot: IEEE,2011: 590-593.

[25] PAN C,ZHU H,YU B,et al.Distributed optical fiber vibration sensing system based on differential detection of differential Coherent-OTDR［C］∥Sensors.Taipei,IEEE,2012: 1-3.

[29] SHATALIN S V,TRESCHIKOV V N,ROGERS A J.Interferometric optical time-domain reflectometry for distributed optical fiber sensing［C］∥Proc.SPIE,3479,Laser Interferomtry IX: Applications.San Diego,CA: SPIE,1998: 181-191.

[30] CHOI K N,TAYLOR H F.Spectrally stable Er-fiber laser for application in phase-sensitive optical time-domain reflectometry［J］.IEEE Photonics Technology Letters,2003,15(3): 386-389.

[31] JUAREZ J C,MAIER E W,CHOINAM K N,et al.Distributed fiber-optic intrusion sensor system［J］.Journal of Lightwave Technology.2005,23(6): 2081-2087.