Multi-line scanning laser radar device

Abstract

The invention provides a multi-line scanning laser radar device, which comprises a moving part and a fixed part which are connected by a rotary support, wherein a laser emitting optical system and a laser receiving optical system are arranged inside the moving part in parallel; a driving motor is arranged inside the fixed part and is fixedly connected with the rotary support through a rotating shaft; and the laser emitting optical system, the laser receiving optical system and the driving motor are electrically connected with a driving control system respectively. The aim of performing multi-line three-dimensional scanning on an imaging target is fulfilled, and the imaging speed and the imaging quality are improved.

Description

technical field [0001] The invention belongs to the technical field of laser radar, and specifically relates to a multi-line scanning laser radar device realized by using a concentric spherical lens group. Background technique [0002] LiDAR is mainly composed of transmitting system, receiving system, signal processing, follow-up control system and display system. Its working principle is as follows: the laser emits laser light, and shoots into the space through the optical modulator, beam controller and optical scanning system. Under the control of the scanning system, the laser beam scans in the space in a specific way. When the laser spot irradiates the target, Scattering occurs, and a part of the photoelectric signal scattered back is detected on the optical detector through the optical receiving system, and then converted into an electrical signal by frequency mixing, and then amplified, information processed, and finally the target signal is displayed. [0003] Imagin...

AI Technical Summary

Problems solved by technology

Although non-scanning imaging lidar has the advantages of simple structure and fast imaging speed, the development of its focal plane array is not mature, especially in China, area array detectors are difficult to obtain, so currently lidar mostly uses scanning imaging working system

[0005] The current laser radar technology is mainly to convert a part of the scattered photoelectric signal into an electrical signal through frequency mixing to display the target signal. During the conversion, there is signal loss and the target information is inaccurate.

In addition, the current imaging method of laser radar for scanning imaging has certain limitations: most of them use non-concentric spherical lenses, and the laser group and its corresponding APD receiving device are placed on the focal plane. The aberrations of the laser group and the laser group on the optical axis are different, resulting in different measurement errors

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