Application of laser ranging sensor in intelligent transportation

Due to its strong anti-interference ability and high precision, the laser ranging sensor has been greatly developed since its birth and plays a huge role in all walks of life. Soon after the world's first ruby laser was introduced in 1960, laser ranging technology with the main function of precision ranging was born.

The application of laser ranging technology in the field of intelligent transportation mainly includes: laser speed sensor, car collision avoidance system, traffic flow monitoring, vehicle drawing, vehicle pedestrian illegal monitoring and other sophisticated monitoring and measurement.

1. Car collision avoidance detector

In general, the laser ranging sensors of most existing automobile collision prevention systems use a laser beam to contact the target car in front of or behind the vehicle in a non-contact manner when the distance between the cars is less than a predetermined safety distance. The automobile anti-collision system can make an emergency brake to the car, or issue an alarm to the driver, or comprehensively determine the target vehicle speed, the distance between the vehicle, the braking distance of the vehicle, the response time, etc., and can immediately judge and respond to the driving of the vehicle, thereby greatly reducing the traffic accident. . The advantages of using it on the highway are even more obvious.

2. Traffic flow monitoring and car outline drawing

This type of use is generally fixed to the gantry of a high-speed or important intersection. The laser launches and receives the vertical ground down, aiming at the middle position of a lane. When a vehicle passes, the laser ranging sensor can output the measured value in real time. The relative change in the distance value, which in turn depicts the contour of the car being measured.

This measurement method generally uses a ranging range of less than 30 meters, and requires a relatively high laser ranging rate, and generally requires 100 Hz.

This can achieve good results for monitoring on important road sections. It can distinguish between various models, and the sampling rate of the body height scanning can reach 10 cm. The vehicle flow limit, length limit, vehicle classification, etc. can be resolved in real time, and the results can be quickly output.

3. Vehicle pedestrian illegal monitoring

In some sections of the road that prohibits or prohibits the passage of pedestrian vehicles, the laser beam is parallel to the road surface to perform fixed emission at a certain height or to scan at a certain angle. When there is a vehicle illegal parking, a red light or a pedestrian illegally crossing the guardrail, etc., the laser ranging distance value Change, you can make an alarm or a warning.