In order to measure the structural strain inside concrete under the impact of explosions and other strong shock loads, a flat-type multi-parameter distributed fiber optic sensor was developed. In this experiment, we employed distributed fiber optic sensing technology by deploying optical fibers at typical positions on the explosive model to monitor the real-time strain distribution of the structure under explosive impacts. Simultaneously, fiber optic grating sensors were embedded in the structure to accurately measure the strain parameters at specific locations. The experimental results demonstrate that the embedded distributed fiber optic sensors can accurately measure the internal strain of the concrete structure. The measured pit diameter on the target surface was 41cm, which is very close to the actual damage range (diameter of 37cm). The measured damage level also aligns with the actual damage level of the target. The fiber optic grating sensors, packaged with glass fiber-reinforced polymer (GFRP), exhibited stable measurements around 298με, which is almost identical to the distributed fiber optic measurement of strain at the center of the target, which was 253με. This technology overcomes the limitations of traditional measurement methods and is suitable for testing dynamic stress and strain under explosive impacts and in harsh environments with moisture and electromagnetic interference. It has excellent prospects for application.
This paper analyzes the demand of temperature measurement for high temperature wells of oilfields and demonstrates the unique advantages of the distributed optical fiber temperature sensors in comparison with conventional means for temperature measurement. Through the actual test results of the heavy oil area, the feasibility and advantages of the distributed optical fiber temperature measurement are verified. A summary of development trend of the distributed optical fiber temperature measurement system as the core technology applied in the oilfield logging is also given.
To improve the level of management and monitoring of leakage and abnormal disturbance of long distance oil pipeline, the distributed optical fiber temperature and vibration sensing system is employed to test the feasibility for the healthy monitoring of a domestic oil pipeline. The simulating leakage and abnormal disturbance affairs of oil pipeline are performed in the experiment. It is demonstrated that the leakage and abnormal disturbance affairs of oil pipeline can be monitored and located accurately with the distributed optical fiber sensing system, which exhibits good performance in the sensitivity, reliability, operation and maintenance etc., and shows good market application prospect.
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