A scanning distortion correction method based on  X- Y galvanometer Lidar system

doi:10.1088/1674-1056/abcf42

Abstract \baselineskip=12pt plus.2pt minus.2pt Aiming at the problem of scanning distortion in X-Y galvanometer light detecting and ranging (Lidar) scanning system, we propose a method of image scanning distortion correction with controllable driving voltage compensation. Firstly, the geometrical optics vectors model is established to explain the principle of pincushion distortion in the galvanometer scanning system, and the simulation result of scanning trajectory is consistent with experiments. The linear relationship between the driving voltage and the scanning angle of the galvanometer is verified. Secondly, the relationship between the deflection angle of the galvanometer and the scanning trajectory and the driving voltage is deduced respectively, and an image scanning correction algorithm with controllable driving voltage compensation is obtained. The simulation experiment results of the proposed method show that the root-mean-square error (RMSE) and the corresponding curve between the scan value and the actual value at different distances, have a good correction effect for the pincushion distortion. Finally, the X-Y galvanometer scanning Lidar system is established to obtain undistorted two-dimensional scanned image and it can be applied to the three-dimensional Lidar scanning system in the actual experiments, which further demonstrates the feasibility and practicability of our method.

Keywords: Lidar laser scanning optical vector model image scanning

Received: 28 August 2020
Revised: 09 November 2020
Accepted manuscript online: 01 December 2020

PACS:	42.68.Wt	(Remote sensing; LIDAR and adaptive systems)
	42.55.-f	(Lasers)
	11.90.+t	(Other topics in general theory of fields and particles)
	42.30.-d	(Imaging and optical processing)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61775048 and 62027823) and the Natural Science Foundation of Shenzhen (Grant No. JCYJ2020109150808037).

Corresponding Authors: ^†Corresponding author. E-mail: wangch_hit@163.com

Cite this article:

Bao-Ling Qi(漆保凌), Chun-Hui Wang(王春晖), Dong-Bing Guo(郭东兵), and Bin Zhang(张斌) A scanning distortion correction method based on X- Y galvanometer Lidar system 2021 Chin. Phys. B 30 044206

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