A lateral locating method for optical fiber distributed intrusion sensing system

Abstract A lateral locating method is proposed and demonstrated in optical fiber distributed vibration sensing system based on phase-sensitive optical time domain reflectometer. The locating depends on a method of time difference of arrival to calculate the time difference between two sensing points. Through this method, we can get the vertical distance between the vibration source and the sensing fiber. Therefore, we can make sure the degree of danger of intrusion. The test results show that the locating accuracy is about 2.10 m with 100-MHz sampling rate, 1-kHz pulse repetition rate, and 1500 sampling points within one pulse interval.

[1]  Xiaoyi Bao,et al.  Distributed Vibration Sensor Based on Coherent Detection of Phase-OTDR , 2010, Journal of Lightwave Technology.

[2]  Hiromichi Horinaka,et al.  Balanced polarization maintaining fiber Sagnac interferometer vibration sensor. , 2011, Optics express.

[3]  Zhimin Chen,et al.  Vibration-displacement measurements with a highly stabilised optical fiber Michelson interferometer system , 2010 .

[4]  B. Kizlik,et al.  Fibre optic distributed sensor in Mach-Zehnder interferometer configuration , 2002, Modern Problems of Radio Engineering, Telecommunications and Computer Science (IEEE Cat. No.02EX542).

[5]  Xiaoyi Bao,et al.  Modulated pulses based distributed vibration sensing with high frequency response and spatial resolution. , 2013, Optics express.

[6]  Michael L. Oelze,et al.  Measurement of Attenuation and Speed of Sound in Soils , 2002 .

[7]  J. Juarez,et al.  Distributed fiber-optic intrusion sensor system , 2005, Journal of Lightwave Technology.

[8]  R. Bernini,et al.  Dynamic strain measurement in optical fibers by stimulated Brillouin scattering. , 2009, Optics letters.

[9]  X. Bao,et al.  Distributed optical fiber vibration sensor based on spectrum analysis of Polarization-OTDR system. , 2008, Optics express.

[10]  Xiaohan Sun,et al.  Frequency response of distributed fiber-optic vibration sensor based on nonbalanced Mach-Zehnder interferometer , 2013 .

[11]  X Fang,et al.  Fiber-optic distributed sensing by a two-loop Sagnac interferometer. , 1996, Optics letters.

[12]  Chao Zuo,et al.  Dual Michelson interferometers for distributed vibration detection. , 2011, Applied optics.