Location Method of Distributed Fiber-Optic Perimeter Security System Based on Mach-Zehnder Interferometer

Ying, 张颖 Zhang; Jiamei, 陈佳妹 Chen; Gang, 李刚 Li; Hongjie, 李红杰 Li; Yanwei, 吴艳微 Wu; Wei, 李伟 Li

doi:10.3788/cjl201239.0605005

Cited by 2 publications

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“…In particular, they have been applied for sensing in various areas of interest, such as chemical, acoustic waves, pressure and temperature measurement. [13][14][15] Distributed fiber-optic sensor monitoring systems have been applied to detect pipeline-leakage based on a Sagnac interferometer. [8][9][10][11][12] Therefore, this technology may be suitable for long distance pipeline security operation monitoring.…”

Section: Introductionmentioning

confidence: 99%

Security monitoring system based on a line structure Sagnac interferometer with 3 × 3 coupler

Ruan

2016

Opt. Eng

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Damage action, such as human disruption, is one of the major threats to pipeline operation. It is essential to monitor perturbation behavior and locate the position in real time. A pipeline security monitoring system is proposed using a line structure Sagnac distributed optic fiber interferometer with a 3 × 3 coupler that can modulate the optic signal phase without special modulation and demodulation. The optic structure of the system is simplified, signal processing accuracy improved, and the effect of polarization reduced. The working principle of the monitoring in ideal conditions and phase demodulation are analyzed and the location of the possible damage point is formulated. Simulation and validation tests confirm the feasibility of the proposed monitoring system and indicate that the low frequency signals <1 kHz can be detected effectively. A disturbance can be accurately located over long monitoring distances. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 06/27/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 064108-6 June 2016 • Vol. 55(6) Ruan, He, and Wu: Security monitoring system based on a line structure Sagnac interferometer with 3 × 3 coupler Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 06/27/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Li Ruan received his PhD degree from Beijing University of Technology. His research interests include optic fiber detection and signal processing. Cunfu He is now a professor. He received his PhD degree from the Department of Engineering Mechanics, Tsinghua University. His research interests include modern NDT method and signal processing. Bin Wu is currently a professor. He received his PhD degree from Taiyuan University of Technology. His research interests include elastodynamics, modern NDT method, and signal processing. Optical Engineering 064108-8 June 2016 • Vol. 55(6) Ruan, He, and Wu: Security monitoring system based on a line structure Sagnac interferometer with 3 × 3 coupler Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 06/27/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Section: Introductionmentioning

confidence: 99%

Security monitoring system based on a line structure Sagnac interferometer with 3 × 3 coupler

Ruan

2016

Opt. Eng

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Unscented Particle Filtering Algorithm for Optical-fiber Sensing Intrusion Localization Based on Particle Swarm Optimization

Hua

Jiang

2015

TELKOMNIKA

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To improve the convergence and precision of intrusion localization in optical-fiber sensing perimeter protection applications, we present an algorithm based on an unscented particle filter (UPF). The algorithm employs particle swarm optimization (PSO) IntroductionOptical-fiber sensor-based intrusion detection technologies are widely used in perimeter security protection systems. Recently, the optical fiber sensing technologies available for intrusion detection include the interferometer-based optical fiber sensors and the optical time domain reflectometry (OTDR)-based optical fiber sensors, and each of which has characters [1]- [8]. Among the technologies, the interferometer-based optical-fiber sensors are preferred in intrusion detection for their high sensitivity to vibrational signals and low cost. As is known, it is important to localize the intruder when an intrusion signal is detected in a perimeter protection system. Generally, the underground intrusion signals to be detected are acoustic (or vibrational) signals generated by the intruder. When an intrusion occurs, the time of arrival (TOA) of the intrusion signal is used to locate the position of the intruder approximately [9].As the interferometer-based systems use consecutive laser pulses, the interval between the laser being sent out and the intrusion signal arriving at the receiver cannot be determined. Thus, the TOA of the intrusion signal cannot be accurately measured, which affects the precision of intrusion localization. To get the precise TOAs of the intrusion signals, many signal processing algorithms were employed [11]. However, the approaches suffer from the measurement errors for the fast speed of the laser propagating in the optical fiber, the errors of the time limit the precision of the intrusion localization to tens of meters [12]. Many researchers have worked on this problem and various signal processing algorithms have been employed to obtain a precise TOA in optical-fiber sensing localization [13], [14]. To improve the precision of intrusion localization, we have previously used the geometrical positions of the distributed sensors and the differences in relative TOAs to estimate the position of the intruder [15]-[16]. State estimation-based methods demonstrate high precision. However, as the measurement equation is nonlinear, the convergence speed is poor and the precision is subject to measurement errors.In this paper, a particle filter is used to handle the problem of nonlinearity in optical-fiber sensing intrusion localization. To avoid the degeneracy problem and sample impoverishment after resampling, we employ the unscented particle filter (UPF) and use particle swarm optimization (PSO) to maintain diversity in the particles. A series of simulations demonstrate that the proposed algorithm improves precision and convergence when there is no prior intruder location.

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Location Method of Distributed Fiber-Optic Perimeter Security System Based on Mach-Zehnder Interferometer

Cited by 2 publications

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Security monitoring system based on a line structure Sagnac interferometer with 3 × 3 coupler

Security monitoring system based on a line structure Sagnac interferometer with 3 × 3 coupler

Unscented Particle Filtering Algorithm for Optical-fiber Sensing Intrusion Localization Based on Particle Swarm Optimization

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