Fully distributed pipeline erosion monitoring system and method based on optical fiber sensing

Abstract

The invention discloses a fully distributed pipeline erosion monitoring system and method based on optical fiber sensing, and the system comprises a pipeline, two temperature sensing optical cables, and a temperature demodulator, the pipeline is buried in a soil body, the first temperature sensing optical cable is laid in the soil body 10-20cm away from the upper part of the pipeline, and a second temperature sensing optical cable is laid at a certain distance right above the first temperature optical cable; the two temperature sensing optical cables are laid in the whole axial direction of the pipeline, and the same ends of the two temperature sensors are connected with the temperature demodulator to form a loop; and the temperature demodulator collects the temperature of a soil body at the buried position through the temperature sensing optical cables, the first temperature sensing optical cable measures the temperature T1 at the pipeline, and the second temperature sensing optical cable measures the temperature T2 at the reference position. The system has the characteristics of simple installation, immediate feedback, labor saving and good weather interference resistance.

Description

technical field [0001] The invention belongs to geological monitoring technology, in particular to a fully distributed pipeline erosion monitoring system and method based on optical fiber sensing. Background technique [0002] In pipeline engineering, the exposure of the pipeline due to the thinning of the covering soil layer will make its integrity more likely to be threatened, especially when the pipeline passes through high-consequence areas, the leakage will have a serious impact on the local natural ecology and public health. Therefore, the prevention and monitoring of pipeline erosion is the focus of pipeline operation. [0003] At present, in terms of monitoring the thickness of the covering soil layer on the surface of the pipeline, the industry mainly adopts the method of manual inspection and the use of sand markers in important areas. have a certain time lag. Among them, manual inspection often requires that the pipeline is partially exposed in a certain area to...

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Problems solved by technology

[0003] At present, in terms of monitoring the thickness of the covering soil layer on the surface of the pipeline, the industry mainly adopts the method of manual inspection and the use of sand markers in important areas. have a certain time lag

Among them, manual inspection often requires the pipeline to be partially exposed in a certain area before discovering the problem, and it is difficult to identify the thinning of the pipeline covering soil protection layer

However, for some emerging instrument measurement methods based on the principle of optics and acoustics, they are easily restricted by factors such as weather and climate, which greatly affects their accuracy.

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