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 order to monitor and position the leakage of the heat network in real time effectively, this study introduces and adopts distributed optical fiber temperature sensing (DTS) system as the method of heat network leakage monitoring. The temperature change rate is used as the basis for determining the operating state. Not only does the whole system have no blind zone of leakage 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 system has a high promotion value in the field of heat network leakage monitoring.
This paper introduces an intelligent fiber detection system for perimeter security. This system detects personnel turning over wall and passing through ground intrusion by a common single-mode communications optical cable on the wall or under the ground. When the intrusion happens, the system detects and locates the behavior. Then the high-speed camera will be controlled to turn and shoot the location of the invasion through the relay module, video recorders, switches and fiber optic transceivers. Meantime, the alarm information will be remotely published. This whole system design is reasonable and put into operation for half years in Daxing smart parks in Beijing. It realizes the function of the intrusion monitoring, identification, proof providing and information publishing, which improves intelligence level of the park administration.
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