What is the speed measurement principle of a sedan?
1 Answers
Automobile speed measurement generally uses radar to measure speed. Its principle is to calculate the frequency shift of the received reflected wave to determine the moving speed of the measured object. In addition, there are other methods for automobile speed measurement, such as loop speed measurement, video speed measurement, microwave radar speed measurement, and acoustic speed measurement. Loop speed measurement: Loop speed measurement uses induction loops buried underground in the road surface to measure speed. This method is relatively accurate but requires significant construction work. Once the road surface is altered, the loops need to be re-buried. Video speed measurement: Video speed measurement involves computer analysis of captured images to determine the vehicle's travel route and behavior process, thereby capturing images of traffic violations. This method is not limited by road conditions and is relatively easy to install, but it is greatly affected by weather. Microwave radar speed measurement: Microwave radar works in conjunction with high-speed cameras to quickly capture images of violating vehicles and uses high-speed shutters for violation evidence collection. Its advantage is the ability to capture images of high-speed vehicles, typically used on highways. Acoustic speed measurement: Acoustic speed measurement involves emitting ultrasonic waves from an ultrasonic transmitter and determining the distance based on the time difference when the receiver detects the ultrasonic waves. This method has higher costs and is not suitable for harsh environments.
