Laser radar system

Abstract

The invention relates to a laser radar system which comprises a light source unit, a scanning unit and a receiving unit, the light source unit comprises a laser, a collimating lens and a special lens, the central area of the special lens is plated with a reflecting film, the area, except the central area, of the special lens is plated with an antireflection film, the scanning unit comprises a mems galvanometer and a prism controlled by a motor, the mems galvanometer has scanning angles in the vertical direction and the horizontal direction and can control laser incident on a reflecting surface to be emitted in the two directions, and the receiving unit comprises a special lens, a focus lens and a sensor. According to the invention, beam expanding scanning can be carried out through the mems galvanometer and the prism controlled by the motor to rotate, accurate detection scanning of the environment is realized, beam expanding can be realized without a splicing mode, and the cost is greatly saved.

Description

technical field [0001] The invention relates to a laser radar system, belonging to the technical field of laser radar research. Background technique [0002] LiDAR is a laser detection and ranging system LiDAR (Light Detection and Ranging), which is a radar system that detects the position, speed and other characteristic quantities of a target by emitting a laser beam. Its working principle is to first send a detection laser beam to the target, then the receiver receives the signal reflected from the target, and finally the laser radar compares the reflected signal with the transmitted signal, and after proper processing, the relevant information of the target can be obtained, such as the target Parameters such as distance, orientation, height, speed, attitude, and even shape. Due to the inherent advantages of lidar in environmental perception, it has a good application prospect in areas such as unmanned driving and obstacle avoidance. At present, lidar mainly includes mec...

AI Technical Summary

Problems solved by technology

At present, lidar mainly includes mechanical rotating lidar and splicing MEMS radar. Mechanical rotating lidar drives the transmitting module and receiving module to rotate 360° by the rotating part to obtain the surrounding environment distance signal. However, the above-mentioned mechanical rotating lidar has many shortcomings. : Multi-line (such as 32-line, 64-line) laser radar transmitting module and receiving module are set in pairs, which requires high angle setting and is difficult to manufacture, which is not conducive to mass production and high price; its rotating parts are easy to wear and even failure, requires regular maintenance

Splicing MEMS radars have advantages over mechanical radars in terms of service life and maintenance. However, the horizontal field of view of MEMS lidars is usually only about 45°. If a larger field of view is required, it can only be achieved by splicing. Generally, 3-5 optical path splicing is required to achieve large-angle target scanning. The same device needs to use multiple paths, which is expensive

Images