Damage monitoring experiment on diagonal pressure pipe based on distributing optical fiber

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Aiming at the prefabricated damage of the elbow of the polygonal pressure pipe, a test system was established based on the distributed optical fiber sensor and the damage monitoring test under the high temperature pressure flow condition, the high temperature normal pressure condition and the normal temperature pressure condition was carried out. The broadband vibration noise of the fluid conveying pipeline under high temperature flow conditions is much higher than the strain noise level measured by the optical fiber sensor, and the strain change characteristics are difficult to distinguish; under the high temperature and normal pressure conditions, the impact range of the circular strain of the damage is small, and the measurement path Damage can be monitored within the damage range; the strain curve of the axial measurement section is messy under normal temperature and pressure conditions, and there is no obvious damage feature. Obvious strain peaks can be seen in the circumferential measurement section, and the damage location accuracy is less than 0.1m. The results show that the distributed optical fiber sensor has obvious characteristics of damage in the axial temperature load measurement, and the damage characteristics of the internal pressure load in the circumferential measurement. The decoupling processing can realize the high temperature and high pressure linear pipeline damage monitoring.