Laser radar

Abstract

The invention discloses a laser radar comprising a light emitting unit, a light receiving unit and a control processing unit. The light emitting unit comprises a light source subunit, an optical phased array subunit and a MEMS scanning mirror subunit that are arranged successively in a light propagation direction; and the light source subunit, the optical phased array subunit and the MEMS scanningmirror subunit are connected with the control processing unit electrically. The light source subunit emits an incident beam; the optical phased array subunit deflects the incident beam in the first plane to form a one-dimensional beam having a predetermined scan angle on the first plane; the one-dimensional beam is irradiated onto the reflective surface of the MEMS scanning mirror subunit; the MEMS scanning mirror subunit is rotated by the driving force to deflect the one-dimensional beam irradiated onto the reflective surface in a second plane intersected with the first plane, thereby realizing scanning of the one-dimensional beam on the second plane and forming a detection beam. Therefore, the e mechanical losses are reduced and the service life of the laser radar is prolonged.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of laser ranging, and in particular to a laser radar. Background technique [0002] Lidar is a radar system that emits laser beams to detect the position, speed and other characteristic quantities of target objects. The working principle of laser radar is: to transmit a detection signal (laser beam) to the target object, and then compare the received signal reflected from the target object (target object echo, or echo signal) with the transmitted signal, and make an appropriate After processing, the relevant information of the target object can be obtained, such as the distance, orientation, height, speed, attitude, and even shape parameters of the target object, so as to detect, track and identify the target object. [0003] However, most of the three-dimensional scanning lidars that have been mass-produced are multi-line mechanical rotating lidars. The lidars are equipped with macros...

AI Technical Summary

Problems solved by technology

[0003] However, most of the three-dimensional scanning lidars that have been mass-produced are multi-line mechanical rotating lidars. The lidars are equipped with macroscopic mechanical rotating parts to mechanically rotate the entire structure. Therefore, the lidars have serious mechanical problems. Wear and tear, and lower reliability, larger size

To solve this problem, only the reflective prism (or vibrating mirror) in the laser radar can be set to reduce the rotating components, thereby reducing the mechanical friction loss, but the driving power consumption required for the mechanical rotation of the rotating parts in the laser radar structure is relatively low. High, resulting in serious heat generation of the lidar; at the same time, there is still mechanical wear caused by mechanical rotation, resulting in a shorter life span of the lidar

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