トンネルケーブル用温度感知光ファイバーの設置・敷設

Factors to consider in equipment layout. Vibration caused by driving in the tunnel; Electromagnetic interference caused by locomotive start and stop; The humid environment inside the tunnel; Rats inside the tunnel may bite equipment and cause damage; Other interferences that affect system operation.

Layout of temperature sensing fiber optic controller. The temperature sensing fiber optic controller is installed in the station control room or comprehensive monitoring equipment room.

Layout of temperature sensing optical cables in interval tunnels. The heat sources for sensing environmental temperature through temperature sensing optical fibers include radiative heat and convective heat. Convective heat mainly relies on the accumulation of hot air at the top of the tunnel for propagation, 輻射熱は基本的に直線的に伝わりますが、. 実験データ分析によると, トンネル内で火災が起きたとき, 温度感知における光ファイバーの温度検出に対する輻射熱と対流熱の影響は基本的に同等です. 同時に, 上で分析したように, 対流熱の伝播は、車両内の火災が大きい場合にのみ効果的に検出できます。. したがって, 輻射熱は車両内の火災検知の主な要因として考慮されるべきである. そのため、温度を感知する光ケーブルはトンネルの内壁や電車の窓などの高い場所に設置する必要があります。. このようにして, 車内で火災が発生した場合, 温度感知光ファイバーは窓からの輻射熱を感知します, 火災の早期警報を提供する.

実際のアプリケーションで証明されているのは、 temperature sensing fiber optic systems, with their good feasibility and cost-effectiveness, are a powerful supplement to traditional tunnel fire alarm systems. 同時に, other extended applications of temperature sensing fiber optic systems are also constantly expanding and attracting attention in their use.

Real time monitoring of temperature field inside underground tunnels. 通常の状況では, the system can also serve as an interval temperature detector for BAS, monitoring the temperature of the tunnel environment, and energy-saving control of the tunnel ventilation system; When the train is blocked, the blocking mode can be controlled based on the actual situation inside the tunnel.

Protection of interval ring network cables. The system can monitor the heating situation of the interval ring network cables (mainly monitoring the heating situation of cable joints) in real time, and can promptly alert and handle abnormal temperature of cable joints to ensure the normal operation of the system.

Fire alarm in the area under the platform board and cable interlayer. 現在のところ, most rail transit substations that do not use temperature sensing fiber optic systems mostly use temperature sensing cable detection systems under the cable interlayer, which have been criticized by many operating departments due to their high level of misoperation and inconvenience in maintenance. 同時に, under the platform board without corresponding fire alarm equipment, there are many cables and other high safety hazards. If a temperature sensing fiber optic system is installed in the interval at this time, temperature sensing fiber optic cables can be installed in areas that are not suitable for maintenance, such as the cable interlayer and platform board, during the arrangement of fiber optic cables, which can solve all the above problems. As a relatively emerging fire detection method, temperature sensing fiber optic systems can be predicted to have increasingly wide applications in the rail transit industry.

光ファイバー温度センサー, インテリジェント監視システム, 中国の分散型光ファイバーメーカー