Pipeline optical fiber safety monitoring early warning method and system
A safety monitoring and early warning system technology, which is applied in the pipeline system, mechanical equipment, gas/liquid distribution and storage, etc., can solve the difficulties of multi-point vibration signal detection, identification, judgment and positioning, and cannot realize real-time monitoring of vibration signals. Background Strong noise impact and other issues, to achieve low false alarm rate, resource saving, high precision effect
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[0050] Embodiment. Below in conjunction with accompanying drawing and specific embodiment, this method and system are described in further detail:
[0051] The principle of this example is as follows figure 1 shown. The vibration signal 4 around the buried pipeline 1 acts on the sensing fiber 2 in the optical cable laid in the same ditch of the pipeline, and the refractive index, length, core diameter, etc. of the fiber will change slightly, causing the phase to change there. The light source in the detection device 6 adopts a highly coherent light source, and the backward Rayleigh scattering in the sensing fiber 2 interferes with each other. Due to the interference, the change of the phase finally causes the change of the intensity of the Rayleigh scattered light. Vibration signals around the pipeline are monitored by detecting this change. The data processing control device 7 can send a relay control signal to the relay amplifier device 5 through the communication optical ...
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