Accurate speed measurement method and system of large laser spot

Abstract

The invention relates to an accurate speed measurement method and an accurate speed measurement system of a large laser spot. The accurate speed measurement method and the accurate speed measurement system of the large laser spot are used in speed measurement of a vehicle. The accurate speed measurement method of the large laser spot includes following steps: controlling a laser sensor to send out a pulse laser towards a vehicle moving route, and enabling the pulse laser to form the large laser spot above 1m in diameter on the vehicle moving route when no vehicle runs on the vehicle moving route; monitoring situations of a vehicle head when the vehicle head drives into the light spot and moves in the laser spot, obliquely projecting the pulse laser onto the vehicle head, measuring a laser return distance value Ln of the vehicle head at each time point in a moving time segment of the vehicle head in the laser spot, and forming a vehicle head-time pulse waveform map; performing analytical calculation according to the vehicle head-time pulse waveform map, position parameters of the laser sensor and dimension parameters of the light spot so as to obtain speed of the vehicle when the vehicle passes through the laser spot. The accurate speed measurement method of the large laser spot uses the large laser spot to measure the speed, can guarantee that the laser is projected to the same portion of different vehicles, figures out an accurate traveling distance, obtains an accurate speed measurement value, is simple and quick in speed measurement operation, and obtains an accurate and reliable measurement result.

Description

technical field [0001] The invention relates to the technical field of laser measurement and control, in particular to a precise speed measurement method and system for a large laser spot. Background technique [0002] Speeding is called the number one killer of road traffic, and its harm is far more than other traffic violations. Due to the serious harm of speeding, countries all over the world pass different forms of legislation to strictly prohibit speeding, take various effective measures to control speeding, and impose heavy penalties on them, in order to reduce traffic accidents caused by speeding. However, due to the irregularity of vehicle driving and the limitations of measurement methods, the measurement accuracy is not accurate enough. Law enforcement agencies need to select appropriate speed measurement equipment according to their actual conditions to achieve the best speed measurement effect. [0003] There are currently four speed measurement methods for vehi...

AI Technical Summary

Problems solved by technology

Now foreign transportation departments have begun to adopt laser speed measurement systems on a large scale, but the laser speed measurement systems used by various domestic units are all imported from abroad, and the high price has become a bottleneck for mass use of laser speed measurement systems. The laser speed sensor will provide a strong guarantee for the distance measurement and speed measurement work in various industries

Moreover, the traditional pulsed laser cannot ensure that the two laser beams hit the same position on the car, so there is a certain error

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