Traffic safety application technology solutions

1. Why do rail transit systems use fiber optic temperature sensors?

        With the rapid development of my country's economy and the acceleration of urbanization, rail transit 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 is characterized by strong electromagnetic interference, huge networks, and intertwined tunnels. Traditional temperature sensors based on electrical signals are usually greatly limited in terms of safety and signal stability. The electrical insulation, geometric variability, and inherent large signal transmission bandwidth of optical fibers have enabled optical fiber temperature sensors to break through the limitations of electrical temperature sensors, thus providing a very effective means for temperature measurement in subway tunnels and other environments with strong electromagnetic interference.

        Possible locations for rail transit fires include: platforms, equipment areas, underground tunnels, elevated tracks and road tracks, and the vehicle body itself. The fire warning system should be designed to achieve early, effective, and timely fire hazard detection in the above areas, discover 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 relatively stringent. Many traditional fire detectors are difficult to fully play their role in this environment, and high-precision, high-resolution, and electromagnetic interference-resistant distributed optical fiber temperature sensors can overcome these weaknesses of traditional sensors.

        In addition, in the environmental control system of the subway, the main sensors used are indoor temperature and humidity sensors and pipe temperature and humidity sensors. We can install indoor temperature and humidity sensors in public areas such as the station hall and platform area, as well as in important equipment rooms, to monitor the real-time temperature and humidity of the station. These parameters can help operators make reasonable adjustments to the working conditions of various systems in the station to keep the public areas 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 walls or ceilings of station halls, platforms, and equipment rooms.

Introduction to Distributed Fiber Optic Temperature Monitoring

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

        The distributed optical fiber temperature measurement system is a sensor system used to measure the temperature field distribution in space in real time. It uses the same optical fiber as the sensing and transmission medium of temperature information, uses the temperature effect of the optical fiber backscattering spectrum to measure the temperature field information where the optical fiber is located, and uses the optical time domain reflectometry (OTDR) technology of the optical fiber to locate the measurement point.

2. Railway Slope and Track Safety Monitoring

Advantages:

        Strain, rail damage, settlement, displacement, perimeter full parameter monitoring

        Long distance, all-fiber, inherently explosion-proof;

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

        Unattended, wireless data; can integrate perimeter vibration sensors

        The first miniaturized wireless integrated railway safety monitoring system in China

3. Railway Safety Monitoring Network System

Function:

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

Video images, station defense restricted area security

Advantages:

Modular, miniaturized, extensible, multi-functional integrated, wireless + wired, mature + high-tech railway network security full coverage monitoring system

4. The significance of rail transit safety data detection

[Improve safety assurance]: Real-time data of the operating status of rail transit project equipment is monitored to timely and effectively understand the on-site status and prevent accidents before they happen;

[Reduce labor costs]: The system can achieve 24-hour real-time monitoring, which can save manual inspections, solve the difficulties of difficult-to-monitor locations, and fill in the blind spots of monitoring; if an abnormal temperature alarm occurs, it can effectively locate the alarm and guide the staff to perform positioning maintenance, saving time and improving maintenance efficiency;

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

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

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

Features of DTS distributed optical fiber temperature monitoring system

[Advancedness]: Based on the internationally popular 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]: Optical fiber is used as the medium for temperature sensing and signal transmission. The sensor does not need power supply to work, is inherently safe, has excellent insulation performance and anti-electromagnetic interference, and the sensor installation meets safety regulations;

[Stability and Accuracy]: Temperature data is obtained by detecting the movement of light wavelength. The sensor is only sensitive to temperature, avoiding the problem that traditional sensors are easily affected by interference factors such as power supply fluctuations and transmission line losses. The system is stable and reliable; the temperature measurement accuracy reaches ± 1℃, the temperature resolution reaches 0.1℃;

[Long-term operation with high reliability]: The system runs safely and reliably, with stable performance, suitable for long-term continuous operation in harsh environments;

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

[Economical]: The system cost is economical and reasonable, with high cost performance. After it is built and put into use, it can work unattended for a long time, with low maintenance cost;

[Ease of operation and maintenance]: The human-machine interface is friendly and easy to operate; the sensor has no zero drift, no need to calibrate again, and the system is maintenance-free;

6. Related Case Studies