Instrumentation, Techniques, and Measurement

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

[+] Author Affiliations
Li Ruan

Beijing University of Technology, College of Mechanical Engineering and Applied Electronics Technology, Beijing 100124, China

Beijing University of Posts and Telecommunications, Automation School, Beijing 100876, China

Cunfu He, Bin Wu

Beijing University of Technology, College of Mechanical Engineering and Applied Electronics Technology, Beijing 100124, China

Opt. Eng. 55(6), 064108 (Jun 16, 2016). doi:10.1117/1.OE.55.6.064108
History: Received December 5, 2015; Accepted May 25, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Li Ruan ; Cunfu He and Bin Wu
"Security monitoring system based on a line structure Sagnac interferometer with 3×3 coupler", Opt. Eng. 55(6), 064108 (Jun 16, 2016). ; http://dx.doi.org/10.1117/1.OE.55.6.064108


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