Solid-state lidar, structure and control method thereof

Abstract

The present application relates to a solid-state lidar, and a structure and control method thereof. The solid-state lidar includes a transceiver module, a galvanometer, and a beam expander. The transceiver module includes a transmitting module, a beam splitting module, and a receiving module. The beam expander is configured to expand and collimate the output laser reflected by the galvanometer and then to emit the expanded and collimated laser to a detection area, and is also configured to converge the reflected laser to the galvanometer. In a laser emission process, since the transmitting module has constant transmitting power, the divergence angle of the output laser can be reduced by the beam expander so as to accumulate the output laser energy, improve the energy density of the output laser, and further improve the ranging capability of the lidar. In a laser receiving process, the beam expander having a large receiving aperture can receive more reflected laser so as to also improve the ranging capability. Thus, the receiving aperture of the solid-state lidar is no longer limited by the size of the receiving surface of the galvanometer. In the case of equivalent transmitting power and detectors, the ranging capability of the lidar is improved.

Description

technical field [0001] The invention relates to the technical field of laser detection, in particular to a solid-state laser radar, its structure and its control method. Background technique [0002] Lidar has the advantages of high precision and high resolution, and at the same time can obtain the surrounding three-dimensional point cloud information, which has become an indispensable key sensor for future autonomous driving. Compare the received reflected laser light reflected from the object in the detection area with the outgoing laser light to obtain the relevant information of the object's distance, speed, orientation, etc. [0003] Among them, MEMS-based solid-state lidar is a kind of lidar, because the receiving aperture is limited by MEMS, so under the same transmission power and detector, the ranging ability of the lidar will be poor. Contents of the invention [0004] Based on this, it is necessary to provide a solid-state laser radar with better ranging capabi...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a solid-state laser radar with better ranging capability, its structure and its control method for the problem of poor ranging capability of solid-state laser radar.

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