Laser radar scanning system and angle beam expanding device and application thereof

Abstract

The invention provides a laser radar scanning system, an angle beam expanding device and application thereof. The laser radar scanning system comprises at least one light source assembly, a scanning device and at least one angle beam expanding device. The light source assembly generates at least one laser beam, wherein the scanning device reflects the laser beam at a scanning angle, and the anglebeam expanding device amplifies the scanning angle of the laser beam and projects the laser beam outwards. The angle beam expanding device comprises at least one angle expanding device and a light condensing device, wherein the angle expanding device amplifies the scanning angle of the laser beam reflected by the scanning device and maintains the collimation of the laser beam, and the angle expanding device projects the laser beam with the amplified scanning angle outwards so as to expand the detection field of view of the laser radar scanning system.

Description

technical field [0001] The invention relates to the field of radar, in particular to a laser radar scanning system and its angle beam expander and its application. The angle beam expander is used to expand the scanning field of view and improve the scanning efficiency of the target area. Background technique [0002] The laser radar system uses laser light as the light source and emits it on the target object. The target object produces diffuse reflection, and the reflected laser light (including physical information such as amplitude and phase) is accepted by the detector to obtain the distance and orientation of the target object. information to achieve three-dimensional detection of the surrounding environment. The current relatively mature lidar systems include mechanical lidar systems and MEMS (Micro-Electro-Mechanical System, Micro-Electro-Mechanical System) lidar systems. The former utilizes a motor to drive a mechanical shaft, and scans the surrounding environment t...

AI Technical Summary

Problems solved by technology

The mechanical rotation angle of MEMS in the prior art is about 5-10°, limited by the performance of the scanning device, the scanning angle is limited, resulting in a small scanning field of view

MEMS with a large rotation angle has disadvantages such as high cost, slow scanning speed, and short service life, which are not conducive to the application of automotive lidar

Due to the small scanning field of view of the existing MEMS lidar, the target area cannot be detected

At present, in order to achieve the actual use effect of laser radar, it is necessary to improve the performance requirements of MEMS, which increases the cost of laser radar

[0004] In addition, the existing laser radar angle beam expander has the problem of uneven distribution of scanning points, which causes some point cloud data to deviate from the predetermined scanning area, resulting in waste of laser energy

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