Laser distance sensors play a critical role in the subway and rail transit systems, offering a wide array of applications that enhance safety, efficiency, and automation. Key areas of application include:
1. Train Positioning and Control：
Laser range finder sensors provide precise train positioning and speed measurement. By reflecting laser beams and measuring distances, these sensors offer real-time information on train location and velocity, which is essential for automatic driving systems and train control mechanisms.
2. Obstacle Detection：
Ensuring track safety is paramount in subway and rail systems. Laser range finder modules can detect obstacles on the tracks, such as fallen rocks, foreign objects, or other hazards that may affect train operations. Early detection and alert systems help prevent accidents.
3. Tunnel and Track Inspection：
Laser range modules are utilized for routine inspections of tunnels and tracks. They can measure deformations and wear, ensuring the infrastructure's safety and stability. High-precision measurement data allow for the early identification and repair of potential issues.
4. Platform-Train Gap Measurement：
To ensure passenger safety during boarding and alighting, TOF Sensors can measure the gap between the platform and the train. Real-time monitoring and adjustment of the train's position ensure the gap remains within a safe range.
5. Inter-Train Distance Control：
Maintaining proper spacing between trains is crucial in subway operations. Laser distance sensors provide real-time monitoring and control of the distance between trains, preventing rear-end collisions.
6. Automatic Door Control：
In subway stations, the precise control of automatic doors is essential for passenger safety and operational efficiency. Laser distance modules can detect the position of passengers and control the opening and closing of doors automatically, preventing injuries.
7. Maintenance and Repair：
Laser range finder sensors also play a vital role in the maintenance and repair of trains and tracks. They can measure and record wear and tear on various components, providing accurate data to support maintenance and repair efforts, thereby extending the lifespan and reliability of equipment.
Specific Application Scenario Analysis：
1. Precision Positioning Measurements: For high-precision measurements at specific locations (such as door control systems, obstacle detection, etc.), phase-based laser distance sensors are recommended due to their high measurement accuracy, providing more precise data.
2. Large-scale Measurements within the Station: If large-scale measurements within the metro station are required (such as platform length, tunnel width, etc.), pulse-based laser distance sensors are recommended due to their long measurement range and strong resistance to interference.
3. Dynamic Measurements: For scenarios requiring rapid response and real-time measurement (such as train entry and exit detection), pulse-based laser distance sensors are more suitable due to their quick response characteristics.
The application of TOF Laser Distance Sensors in subway and rail transit systems not only enhances the safety and efficiency of train operations but also supports automation and intelligent management. As technology advances, the use of laser rangefinders will continue to expand and deepen in these systems.
