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

A monitoring system, a fully distributed technology, applied in the direction of measuring heat, measuring devices, using optical devices, etc., can solve the problems of accuracy influence, time lag, and the thinning of the protective layer of the pipeline covering soil, etc.

CN112697301BActive Publication Date: 2021-09-14南京嘉兆仪器设备有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-09-14

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Abstract

The invention discloses a fully distributed pipeline erosion monitoring system and method based on optical fiber sensing, comprising a pipeline, two temperature sensing optical cables and a temperature demodulator. Lay the first temperature sensing optical cable in the soil body, and lay the second temperature sensing optical cable at a certain distance directly above the first temperature sensing optical cable; the two temperature sensing optical cables are laid along the entire axial direction of the pipeline, and the two The same end of the temperature sensor is connected to the temperature demodulator to form a loop; the temperature demodulator collects the soil temperature at the buried place through the temperature sensing optical cable, and the first temperature sensing optical cable measures the temperature T1 at the pipeline , the second temperature sensing cable measures the temperature T2 at the reference. It has the characteristics of easy installation, instant feedback, labor saving, and good weather resistance.
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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...

Examples

Embodiment

[0034] Embodiment: In this embodiment, the soil in which the pipeline 1 and the two temperature sensing optical cables are buried is clay.

[0035] Such as image 3 As shown, the three soil depths from the ground in the same vertical direction are set to be 0m, 0.1m and 0.3m, and the temperature-time curves of the three soils at 0m, 0.1m and 0.3m all show periodicity The law of change. Compared with the temperature-time curve at the burial depth of 0m, the phase differences between the 0.1m and 0.3m curves are 5 and 10h respectively. Therefore, by burying the temperature sensing optical cable at the pipeline 1 to be tested and the temperature sensing optical cable at the reference point above, the erosion of the soil on the surface of the pipeline 1 can be judged by the change of the phase difference of the two temperature-time curves. And because the external heat source changes caused by weather such as rainfall have a certain impact on the temperature-time curve itself, b...