P-OTDR在電力光纜與鐵路周界中的安防應(yīng)用
[Abstract]:With the development of society, people's demand for security is higher and higher, and the enthusiasm for intrusion detection sensing system is also increasing in the world. Communication departments need real-time intrusion monitoring or fault diagnosis for their internal communication buildings and external communication cables. In order to increase the protection of passengers, assets and infrastructure, the transport sector also carries out real-time intrusion monitoring of railway stations, railway perimeter lines, tunnels, etc. Industries such as oil and gas also monitor their transportation pipeline status in order to prevent theft and destruction; even the border of the country has installed intrusion monitoring system to prevent illegal elements from entering the country. In these cases, intrusion detection system can be used to avoid casualties, to protect property stolen or damaged, etc. Traditional intrusion detection techniques such as human guard, pulse electronic fence, microwave sensor, ultrasonic sensor alarm, string sensor, active infrared alarm, etc. There are some shortcomings or unsuitable environment of distributed optical fiber vibration sensing technology. Using the transmission characteristics of fiber itself, each point on the fiber is regarded as a sensing unit to achieve the purpose of full distributed monitoring. Optical fiber is not only a sensing unit, but also a signal transmission medium. It is simple in structure, easy to deploy, anti-electromagnetic interference, continuous monitoring of space, security in long distance perimeter, transmission cable, Submarine optical cable and other safety monitoring has a good application prospects. The main work of this paper includes the following aspects: 1. The mechanism of distributed optical fiber vibration sensing is studied. The mechanism of strain and fiber, Rayleigh scattering phenomenon and principle, and the optical time domain reflectance sensing system based on Rayleigh scattering effect are analyzed. Based on the sensing principle of P-OTDR (Polarization Sensitive Optical Time Domain reflectometer), the perimeter security monitoring system is designed and implemented, and the parameters of the system are calculated by combining theory and experiment. 3. Multi-Channel perimeter Security Monitoring system and its Application in the Safety Monitoring of Electric Power Communication Optical Cable, Based on Visual C, the alarm software of disturbance monitoring system is realized. Combining with RFID pipeline location technology and short message cat, the functions of line inspection and real-time short message alarm are realized. 4. Research on the application of perimeter security monitoring system in railway perimeter security monitoring. Based on Visual C, the alarm software of disturbance monitoring system is realized, and the function modules such as video surveillance and short message cat wireless communication are connected. Realize all-round, visual comprehensive monitoring.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U298
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