Traffic safety application technology program

1. Why does the rail transit system use optical fiber temperature sensors?

        With the rapid development of my country's economy and the acceleration of the pace of urbanization, rail transportation with large capacity, high speed and environmental protection is developing rapidly. Since fire safety is one of the important issues that must be considered in the construction and operation of urban rail transit, more and more technicians are paying more attention to the practical application of distributed optical fiber temperature sensors in urban rail transit.

        The subway tunnel environment has the characteristics of strong electromagnetic interference, huge network, and interlocking tunnels. Traditional temperature sensors based on electrical signals are generally limited in terms of safety and signal stability. The electrical insulation, geometric variability and inherent large signal transmission bandwidth of optical fibers make the optical fiber temperature The sensor breaks through the limitation of the electrical temperature sensor, thus providing a very effective means for temperature measurement in subway tunnels and other environments with strong electromagnetic interference.

        The possible locations of rail transit fires are: platforms, equipment areas, underground tunnels, elevated tracks and road tracks, car bodies, etc. The design of the fire-fighting early warning system should realize early, effective and timely fire hazard detection in the above-mentioned areas, detect possible fire hazards as early as possible and take timely measures to avoid fires. Due to the complexity of the rail transit environment, the requirements for fire detection sensors are more stringent. Many traditional fire detectors are difficult to fully play in this environment, and the high-precision, high-resolution, and anti-electromagnetic interference distributed optical fiber temperature Sensors can overcome these weaknesses of traditional sensors.

        In addition, in the subway's environmental control system, the main sensors used are indoor temperature and humidity sensors and pipeline temperature and humidity sensors. We can install indoor temperature and humidity sensors in the station halls and platform areas and other public areas and important equipment rooms to monitor the real-time temperature and humidity of the station. These parameters can help operators to make reasonable adjustments to the working conditions of the station's various systems, so as to keep the public area of the station in a more comfortable environment and ensure that the equipment room is always at a suitable temperature. Indoor temperature and humidity sensors are generally installed on the wall or ceiling of the station hall, platform, and equipment room.

Introduction to distributed optical fiber temperature monitoring

        The working principle of the distributed optical fiber temperature sensor is the temperature effect of Raman scattering, and the theory and experimental technology of this technology are basically mature. Many research institutes and manufacturers at home and abroad have developed independent distributed optical fiber temperature measurement systems and successfully applied them in special environments such as electric power and chemical enterprises, dams, and oil depots.

        The distributed optical fiber temperature measurement system is a sensor system for real-time measurement of the spatial temperature field distribution. It uses the same optical fiber as the sensing and transmission medium for temperature information, uses the temperature effect of the optical fiber back Raman scattering spectrum to measure the temperature field information where the optical fiber is located, and uses the optical time domain reflectance (OTDR) technology of the optical fiber to measure Point to locate.

2. Safety monitoring of railway slope and track

Advantage:

        Full parameter monitoring of strain, rail loss, settlement, displacement and perimeter

        Long-distance, all-optical fiber, intrinsically explosion-proof;

        Series measuring points; strain sensitive; integrated wind and rain sensor;

        Unattended, wireless data; perimeter vibration sensor can be integrated

        The first in the country, a miniaturized wireless integrated railway safety monitoring system

3. Railway safety monitoring network system

Features:

Subgrade settlement track flaw detection, slope displacement bridge and tunnel structure, power safety fire monitoring, wind and rain weather

Video image, security of station defense restricted area

Advantage:

Modularity, miniaturization, extensibility, multi-functional integration, wireless + wired, mature + high-tech railway network security and complete coverage monitoring system

Fourth, the significance of rail transit safety data detection

[Improve safety guarantee] : Monitor the real-time data of the equipment operation status of rail transit projects, so as to understand the on-site status in a timely and effective manner, and prevent problems before they occur;

[Reduce labor costs] : The system can realize 24-hour real-time monitoring, which can save manual inspections, and at the same time solve the difficulties of difficult-to-monitoring locations, and fill in the blind areas of monitoring; if an abnormal temperature alarm occurs, it can effectively locate the alarm and guide the work Personnel conduct locating maintenance, saving time and improving maintenance efficiency;

[Ensure economic benefits] : The system can realize early warning and achieve the goal of "unmanned duty", which can effectively avoid potential safety hazards and safety accidents, thereby ensuring safety while also ensuring economic benefits;

5. Application of Hoyatek DTS Distributed Optical Fiber Temperature Measurement System

        This system adopts today's advanced photoelectric technology, communication technology, microprocessor technology, digital temperature sensing technology and original design of low temperature, strong electric field, and humid environment operation technology. It can separately monitor the temperature in different environments, discover potential accidents as early as possible, and minimize losses. At the same time, it can also provide a large amount of online monitoring data to provide a reliable basis for operators to fully understand the operation of power equipment.

Features of DTS distributed optical fiber temperature monitoring system

[Advancement] : Based on the internationally promoted distributed optical fiber temperature measurement technology, and on the basis of nearly 20 years of successful application experience abroad, this system has excellent technical performance and quality;

[Safety] : Using optical fiber as the medium of temperature sensing and signal transmission, the sensor does not need power supply to work, it is intrinsically safe, has excellent insulation performance and anti-electromagnetic interference, and the sensor installation meets safety regulations;

[Stability and accuracy] : The temperature data is obtained by detecting the movement of the wavelength of light waves. The sensor is only sensitive to temperature, which avoids the problem of traditional sensors that are easily affected by interference factors such as power fluctuations and transmission line loss. The system is stable and reliable; temperature measurement accuracy Reach ± 1℃, and the temperature resolution can reach 0.1℃;

[High reliability in long-term operation] : The system is safe and reliable in operation, stable in performance, suitable for long-term continuous work in harsh environments;

[Compatibility] : The monitoring host has its own standard communication interface, provides Ethernet port, RS232, USB, etc., combined with the variable power station integrated automation system, etc., to achieve data sharing, simple management, and seamless connection with related systems;

[Economy] : The cost of the system is reasonable and cost-effective. After it is completed and put into use, it can work unattended for a long time, and the maintenance cost is low;

[Ease of operation and maintenance] : Friendly man-machine interface, easy operation; the sensor has no zero drift, no need to re-calibrate, and the system is maintenance-free;

Six, related case display