3*3 coupler-based linear type Sagnac pipeline safety monitoring system
A safety monitoring and coupler technology, which is applied in the pipeline system, mechanical equipment, gas/liquid distribution and storage, etc., can solve the problems of inaccurate vibration signal, real-time measurement of disturbance signal location and online real-time positioning, etc., to increase real-time The effect of monitoring and effective monitoring range, improving monitoring accuracy, and reducing the frequency of disturbance signals
Active Publication Date: 2015-03-25
BEIJING UNIV OF TECH
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[0003] The purpose of the present invention is to solve the shortcomings of the vibration signal generated by external disturbances that cannot be accurately and instantly measured and the location of the disturbance signal cannot be located in real time in pipeline safety monitoring, and proposes a distributed optical fiber sensor for real-time pipeline safety monitoring system
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[0014] The following examples are provided in conjunction with the content of the method of the present invention:
[0015] The structure of this embodiment is as figure 1 As shown, including light source (1), 2×1 coupler I (41), polarizer I (21), optical isolator I (31), 2×1 coupler II (42), 3×3 coupler I(51), 2×1 coupler V(45), sensing fiber I(61), Faraday rotating mirror FRM I(71), delay fiber I(81), 2×1 coupler III(43) 2× 1 Coupler IV(44); Polarizer II(22), Optical Isolator II(32), 2×1 Coupler VI(46), 3×3 Coupler II(52), Delay Fiber II(82) , 2×1 coupler IX(49), sensing fiber II(62), delay fiber III(83), Faraday rotating mirror FRM II(72), 2×1 coupler VII(47), 2×1 coupler VIII (48) and signal acquisition device (9); It is characterized in that: the laser light that light source (1) sends passes through 2 * 1 coupler I (41) light splitting, enters main loop and auxiliary loop respectively; Main loop light passes polarizer I (21) and optical isolator I (31) form two optica...
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The invention belongs to the technical field of optical sensors and discloses a 3*3 coupler-based linear type Sagnac pipeline safety monitoring system. Sensor optical fibers laid along a pipeline will generate a vibration sound source when destructive disturbance happens near the pipeline, a local vibration function is generated for optical fibers in an optical cable, then the distributed type optical fibers generate fine deformation, and optical signals spread in the optical cable are modulated. Compared with a prior monitoring system, an upper main circuit and a lower auxiliary circuit are included, the two paths of optical fibers are laid in parallel in the radial direction of the pipeline, safety monitoring is carried out on the same pipeline, the signal attenuation phenomenon generated by the monitoring system is reduced and the reciprocity effect is avoided by utilization of the linear type structure, the system structure is simplified, the current situations that other methods can not monitor the potential destructive behaviors, especially the low-frequency disturbance behavior in real time in a long distance or position destroyed or disturbed places immediately are solved, the monitoring time is effectively shortened, the monitoring range is enlarged effectively, the judgment precision is effectively improved, and monitoring stability and reliability are improved.
Description
technical field [0001] The present invention designs a linear Sagnac optical fiber interferometer sensor system based on a 3×3 coupler, which belongs to the field of optical sensing technology, and its function is to modulate the acoustic signal generated by external disturbances through the optical signal propagated in the optical fiber, Then the modulated optical signal is processed and analyzed, so as to monitor whether there are destructive disturbances such as oil theft or man-made disturbance along the pipeline within the monitored range, and locate the place where the disturbance occurs. The sensor system can be used for long-distance safety monitoring of pipeline systems such as oil and gas transportation and water transportation to realize effective early warning and monitoring. Background technique [0002] At present, traditional methods such as manual inspection, mass balance method, stress wave method, and acoustic wave method are mostly used to determine whethe...
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IPC IPC(8): F17D5/02
Inventor 何存富阮力宋国荣吴斌
Owner BEIJING UNIV OF TECH