Laser speed measurement, as a vehicle speed detection technology developed in foreign countries in the 1990s, is based on laser ranging, that is, using the propagation speed of electromagnetic waves (light waves) (300,000 kilometers per second) to calculate the distance and speed of the measured object. This article will deeply analyze the laser speed meter from the aspects of technical principles, key parameters, usage scenarios and limitations.
1. Technical Principles
The laser speed meter emits a very fine laser beam to the measured object (the divergence angle of the laser emission part is 3mrad, and the diameter is only 30 centimeters at 100 meters), receives the reflected wave, and records the time difference, thereby determining the distance between the measured object and the test point. It is worth noting that laser speed measurement is not a single distance measurement, but two laser distance measurements with a specific time interval. By calculating the moving distance of the measured object during this period, its moving speed is obtained.
2. Analysis of key parameters
1. Speed measurement distance: The effective speed measurement distance of the laser speed meter is relatively long, up to 1,000 meters, far exceeding the conventional range of radar speed measurement.
2. Speed measurement time: The single speed measurement time is about 0.33-0.66 seconds, which means that multiple speed measurements can be completed in a short time, improving the detection efficiency.
3. Laser characteristics: The extremely fine characteristics of the laser beam make it more accurate at long distances, and also reduce the dependence on the measurement environment.
III. Usage scenarios and limitations
1. Usage scenarios: Due to the high accuracy and long-distance detection capability of laser speed measurement, it is widely used in scenarios such as highways and urban expressways that require high-precision speed detection.
2. Usage restrictions: Laser speed meters can only be used in a stationary state and cannot be used in motion, which to a certain extent limits their flexibility of use. In addition, the general electronic detectors on the market have limited interference and detection effects on laser speed meters, which also provides a certain guarantee for the accuracy of laser speed measurement.
IV. Comparison with other speed measurement methods
Compared with radar speed measurement, ground induction coil speed measurement, video speed measurement and other methods, laser speed measurement has higher accuracy and longer detection distance. However, the use restrictions of laser speed meters are also obvious, and measurements need to be made in a stationary state. In addition, different speed measurement methods have their own advantages and disadvantages, and they need to be selected according to specific application scenarios.
In summary, as a high-precision, long-distance speed detection technology, laser speedometers have important application value in traffic law enforcement, electronic equipment procurement and other fields. However, its limitations in use should also be noted, and it needs to be reasonably applied in combination with actual needs.
