In order to monitor the safety of the whole cable in real time and effectively, this study introduces and adopts distributed optical fiber temperature sensing (DTS) technology as the method of cable safety monitoring. A variety of statistical results are used as the basis for judging the running state. Not only does the whole system have no blind zone of safety monitoring, but also provides accurate alarm information and fast response, which enables managers to deal with faults timely and avoid heavy losses. Therefore, the DTS technology has a high promotion value in the field of cable safety monitoring.
Considering the shortcomings of the traditional security technology system, such as poor stability, limited installation environment, high false alarm and missing report rate, this paper proposes a hanging fiber detector and video monitor system for perimeter security based on Michelson Interference Technology, and carries out functional test in the oil terminal of Petrochina Company Limited. In this system, an ordinary single-mode communication optical cable is arranged along the top of the fence in wavy shape. When the intruder climbs or turns over the fence, the system triggers the alarm event and emits an alarm. Then the high-speed dome camera will be controlled to turn and shoot the location of the invasion through the network video recorder and network switch. In the functional test, the system has realized climbing alarm, knocking the wall alarm, multi-point simultaneous intrusion alarm, false alarm learning, broken fiber alarm and other functions, which has better sensitivity, lower false alarm rate and better learning function compared with the products based on Sagnac principle and double MZ principle.
An algorithm of Rayleigh noise compensation in dual-end configured distributed temperature sensor (DE-DTS) is proposed in this paper. A 2 km long multi-mode fiber is used to calculate the attenuation of the light within Anti-Stokes and Stokes bandwidth, and figure out the isolation of the wavelength division multiplex through both Anti-Stokes channel and Stokes channel. Experiments are taken out to validate the proposed Rayleigh compensation algorithm. As a result, the Rayleigh noise in both Anti-Stokes component and Stokes component is compensated, and the temperature error of the dual-end configured distributed temperature sensor is revised. With the help of the proposed algorithm, a dual-end DTS can reach to the absolute accuracy of 1.09°C (RMSE) between 180°C to 300°C, which significantly monishes the temperature error compared to the sensor without Rayleigh noise compensation.
In this study, distributed optical fiber temperature sensing (DTS) system is used as the method of monitoring the temperature field inside the thermal storage tank. On the basis of a practical engineering application, the temperature field characteristics inside the thermal storage tank is obtained and analyzed when the thermal storage and heating system operates. The results show that the distributed fiber temperature sensing system is convenient to construct and build, and it can provide effective data support for the evaluation and design of the thermal storage and heating system.
Oil storage tank is an important facility for oil production and refining. This paper presents a fire monitoring system for oil storage tank based on distributed optical fiber temperature sensing system(DTS), and demonstrates the laying method for both routing fiber and temperature sensing fiber. This system can realize real-time distributed temperature monitoring on the perimeter of secondary sealing ring of oil storage tank and has various alarm mechanisms. The system has been installed and tested in Shikong oil transportation station of China National Petroleum Corporation(CNPC) in Gansu, China. Through the actual test results, the feasibility and advantages of the distributed optical fiber temperature measurement for oil storage tank are verified and the temperature accuracy of the system is better than 1°C.
Distributed optical fiber temperature sensing system (DTS) is a sensing technology for real-time sensor of spatial temperature field distribution. The technology is based on Raman scattering and optical time domain reflection (OTDR),, and is composed of a demodulation host and a temperature sensing cable. The system obtains the ground temperature field change through the temperature sensing cable, calculates the geothermal energy replenishment amount and the recharge rate, and determines the recovery of the geothermal field after heating. It provides according to setting the allowable amount of geothermal energy to be mined and ensuring the long-term sustainable operation of the geothermal heating system.
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