Transportation industry solution

Highway / subway / railway

Summary

With the increase of the number of traffic tunnels, the possibility of all kinds of malignant traffic accidents in the tunnel is becoming more and more high. Especially for the long distance tunnel, once the traffic fire accidents occur, the subsequent accidents are more dangerous and more serious than other accidents. Therefore, the fire monitoring and alarm system for the traffic tunnel appears especially in the traffic tunnel. It's important. The distributed fiber line fire temperature detection system and line fiber grating fire monitoring system are fire monitoring and alarm system based on optical fiber sensing technology. Through real-time detection of optical fiber temperature sensor signals, the line and point type temperature monitoring and fire alarm in the tunnel are realized. Fiber optic sensor has the advantages of small size, light weight, passive detection, anti electromagnetic interference, flame retardant and explosion proof, easy to monitor and so on. The fire monitoring system using fiber optic temperature sensor has the following unique advantages:

1. through the measurement of light, the temperature information of the measuring point is obtained. The effect of the fluctuation of the system light power and the change of transmission link loss on the measurement accuracy is essentially eliminated.

2. distributed by BOTDR technology and fiber Bragg grating wavelength demodulation technology installation position one by one, can accurately determine the location of the fire, the measurement temperature of the sensor directly reflects the fire point of fire.

3. the measurement precision is high and the response time is short. The precision of temperature measurement can reach + 1, and the sampling time is less than 0.2 seconds.

4. Real-time monitoring: It can realize 24-hour uninterrupted on-line monitoring and real unattended power system.

5. The sensor is not affected by ambient humidity, stress and strain. The measurement results have good repeatability and long-term stability.

System structure

The distributed optical fiber line fire temperature detection system and the linear fiber grating fire monitoring system can realize remote centralized monitoring by communication between Ethernet and monitoring computer. Through the RS232/RS485 interface and alarm controller, it can realize the over temperature alarm of the partition and measurement points, and through the multi-stage configurable alarm temperature setting, Fire warning and alarm. In addition, the system debugging, regional settings, alarm parameter settings and other operations can be completed on the main temperature measuring machine or remote monitoring computer, easy operation and maintenance.

System advantage

1. High security: All-optical network communication, intrinsic safety, lightning and explosion protection, strong electromagnetic interference resistance, high insulation, corrosion resistance;

2. fast and accurate: the sensor bias value does not drift, which ensures the accuracy and repeatability of the whole temperature measurement system, and also has a fast response speed.

3., the system is flexible: it can be integrated into comprehensive fire fighting automation system, remote image monitoring system, and so on.

4. real time monitoring: it can achieve 24 hours continuous on-line monitoring and achieve truly unattended system.

5. alarm mode: multi-stage alarm, differential temperature alarm, and short message alarm can be set up. Once abnormal occurs, it can be found in time.