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Composition and advantages of distributed fiber optic temperature measurement sensor system for rail transit cables

The cable fiber optic temperature measurement system plays a significant role in rail transit railways. FJINNO provides fiber optic temperature measurement systems for long-distance fiber optic temperature measurement in railway tunnels, with stable performance, anti electromagnetic interference, high bidding success rate, and reasonable prices.

A large number of cables are usually laid in railway tunnels, and if the cables fail, it will affect the safe operation of trains. Therefore, the railway department should do a good job in the operation and maintenance of cables inside the tunnel. In order to provide convenient conditions for the operation and maintenance of cables in tunnels, fiber optic temperature measurement technology can be reasonably applied.

Composition of fiber optic temperature measurement system for tunnel cables

The cable fiber optic temperature measurement system mainly consists of fiber optic temperature measurement host, temperature sensing fiber optic, monitoring management software, alarm output unit, monitoring cabinet and other components. Among them, temperature sensing fiber optic is a key component with dual functions of temperature sensing and signal transmission. The temperature measurement host needs to be connected to surrounding equipment to build a comprehensive temperature monitoring and early warning system. In this system, real-time monitoring of spatial temperature changes and distribution patterns can be carried out, and timely fire warnings can be issued in case of fire. It has the advantages of wide temperature measurement range, multiple temperature measurement points, flame and explosion prevention, anti electromagnetic interference, and high measurement accuracy. When connected to fiber optic transmission devices, it can monitor equipment temperatures within tens of kilometers.

Function of fiber optic temperature measurement system for tunnel cables

The distributed fiber optic temperature measurement system can achieve online temperature monitoring, intelligent control, monitoring and early warning, automatic alarm and other functions, ensuring the safe passage of trains in railway tunnels and avoiding fires. The system needs to be connected to a management workstation. When the fiber optic temperature measurement host in the system detects temperature information, it can immediately upload the information to the management workstation to achieve full process monitoring of temperature changes. At the same time, the cable fiber optic temperature measurement system in railway tunnels also needs to be connected to a fire alarm controller. When the system detects a fire signal, it can quickly transmit the signal to the fire alarm controller, which will issue an alarm. The cable fiber optic temperature measurement system utilizes advanced technology and features a distributed structure, which can improve the reliability of temperature measurement results and facilitate daily operation and maintenance.

Characteristics of fiber optic temperature measurement system for tunnel cables

1. Distribution monitoring
The cable distributed fiber optic temperature measurement system has various forms of distributed temperature measurement functions, such as point type temperature measurement and linear temperature measurement. It can dynamically and continuously monitor temperature and fire information in the monitoring area, meeting the requirements of online simultaneous temperature measurement for railway tunnel electrical equipment.

2. Accurate monitoring
The system can accurately measure a certain detection point at any time node, ensuring accurate temperature measurement positioning and measurement results.

3. Accident judgment
The system can make judgments on the type, location, and degree of harm of accidents based on monitoring results, accurately distinguishing types of accidents such as anomalies, overheating, and fires, making it easy to make corresponding decisions and deployments according to the type of accident.

4. Automatic alarm
The system can set alarm values for different fixed temperature points, as well as differential temperature alarm values. If 60 ℃, 70 ℃, and 85 ℃ can be set to different alarm levels. The system can also set different alarm forms in each alarm control area, such as an initial alarm of 30 ℃, a pre alarm of 40 ℃, and a measure activation of 50 ℃. In the alarm output, different colored sound and light effects can be set, and alarm information can be output through relays, communication lines, and other paths.

5. Fire analysis
Real time detection of temperature changes in the fire area, prediction of the direction of fire spread, smoke spread, and fire development speed, providing decision-making basis for disaster relief command departments to quickly extinguish the fire, reduce casualties and property losses.

6. Multi channel fiber optic interface
The system can meet the temperature measurement needs of the star shaped structure monitoring area by deploying temperature sensing optical fibers in various directions from the fiber optic temperature measurement host, realizing the connection of multiple temperature sensing optical fibers to the same host, reducing the investment cost of laying temperature sensing optical fibers back and forth, and achieving the goal of outputting temperature measurement information through multiple optical paths.

7. Strong applicability

Temperature sensing optical fibers have a long service life, strong corrosion resistance, flame retardancy, explosion-proof, radiation resistance, electromagnetic interference resistance, high temperature resistance, and other characteristics, which can enable the system to operate for a long time without the need to replace optical fibers. At the same time, it can also ensure the temperature measurement accuracy of the system under toxic and harmful harsh conditions.

8. Freely set parameters
The distributed fiber optic temperature measurement system of FJINNO can set the temperature rise rate, adjust the temperature rise change function, and intelligently adjust temperature parameters according to environmental conditions. The system has strong compatibility and provides multiple relay output interfaces, which can be connected to the central alarm system and automation equipment. The number of output relay modules can be set according to the needs of fire engineering, and the signal can be transmitted to the equipment. The alarm system sets a threshold to determine whether an alarm is needed. At the same time, the system also has programming function, which can program alarm points and areas according to the monitoring area situation, accurately locate the damaged points of the optical cable, and facilitate timely troubleshooting.

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