At present, the speed measurement technologies widely used in my country include radar speed measurement, ground sensor coil speed measurement, video speed measurement, infrared detection and laser speed measurement. Among them, laser speed measurement, as an efficient way to detect vehicle speed, has become increasingly important in road traffic law enforcement in recent years. Let's take a closer look at the principles and characteristics of laser speed measurement.

Laser speed measurement is based on the vehicle speed detection technology developed abroad in the 1990s. It uses the principle of laser ranging, that is, electromagnetic waves propagate at a speed of 300,000 kilometers per second. By emitting a laser beam to the object to be measured, receiving the reflected beam, and recording the time difference, the distance between the object to be measured and the test point can be accurately calculated. Laser speed measurement determines the moving distance of the object to be measured during the period through two distance measurements with a specific time interval, and then derives its moving speed.

Laser speed measurement has many significant characteristics:

First, it has the ability to accurately aim. The laser beam emitted by the laser speed meter is very thin, with a divergence angle of only 3mrad, so the irradiation diameter at 100 meters is only 30 centimeters, which can accurately lock any target.

Secondly, the laser speed measurement has a longer range. Compared with radar speed measurement, the effective distance of laser speed measurement is longer, and it can measure up to 1,000 meters away, which is convenient for long-distance capture without being easily detected.

In addition, laser speed measurement is sensitive, and the single speed measurement time is about 0.33-0.66 seconds, which can quickly obtain vehicle speed information.

It should be noted that laser speed meters are usually used in a stationary state. Due to the limitations of its working principle, laser speed meters cannot be used in motion, so traffic police usually place them on patrol cars and perform speed measurement operations after parking.

In addition, laser speed meters have anti-interference capabilities. Because the laser beam is extremely thin and reacts quickly, general electronic detectors on the market cannot effectively interfere with or detect the work of laser speed meters.