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Optical Engineering

Security monitoring system based on a line structure Sagnac interferometer with 3×3 coupler
Author(s): Li Ruan; Cunfu He; Bin Wu
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Paper Abstract

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.

Paper Details

Date Published: 16 June 2016
PDF: 8 pages
Opt. Eng. 55(6) 064108 doi: 10.1117/1.OE.55.6.064108
Published in: Optical Engineering Volume 55, Issue 6
Show Author Affiliations
Li Ruan, Beijing Univ. of Technology (China)
Beijing Univ. of Posts and Telecommunications (China)
Cunfu He, Beijing Univ. of Technology (China)
Bin Wu, Beijing Univ. of Technology (China)

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