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.
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[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...
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