A：
The vehicle light curtain accurately measures the length and speed of the vehicle through precise beam scanning technology. The main principles are as follows:
✅Detect vehicle length
· Multiple infrared light curtain arrays span the lanes to form a dense detection area.
· When a vehicle passes by, the time difference between the first and last beams of the blocked beams multiplied by the vehicle's moving speed can be used to calculate the vehicle length.
· The smaller the beam spacing (such as 2.5mm/5mm), the higher the measurement accuracy.
✅Detect vehicle speed
· The front of the vehicle first blocks a group of beams, and the system records the first blocking time;
· During the movement of the vehicle, multiple beams are blocked continuously, and the system calculates the average speed based on the time difference and distance of these blocking points;
· Usually, dual light curtain distance measurement method or time difference speed measurement method is used.
✅Advantages
· Non-contact, non-destructive detection;
· Real-time response, suitable for high-speed traffic;
· Can accurately identify various types of vehicles (cars, trucks, trailers, etc.).
✅Application scenarios
· Widely used in highway toll stations, ETC systems, lane separation detection, intelligent transportation systems, etc.
· Through high-precision measurement and fast response, vehicle light curtains can achieve accurate classification, billing and traffic statistics.
