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

Abstract

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.

Ultra wide sensing range plasmonic refractive index sensor based on nano-array with rhombus particles*

“…Surface plasmon on metal micro-nano structure is an important research field of micro-nano optics. Its applications include but are not limited to photolithography, [23,24] absorber, [25][26][27] filter, [28][29][30] surface enhanced Raman, [31][32][33][34] and photonic crystal fibers. [35][36][37] Optical sensor based on surface plasmon resonance (SPR) is a strongly active field in recent years [38][39][40][41][42] due to the advantages of high-sensitivity, rapid, specific, and real-time compare with traditional biological/chemical sensors.…”

A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO 2 spacer

“…[38] With the continuous upgrading of lithography technology, more complex structures can be realized. For plasmonic sensors, these novel structures [39][40][41][42][43][44][45] are certain to have potential for RI sensor applications, and some of them may provide higher RI sensitivity and better FOM.…”

A high-quality-factor ultra-narrowband perfect metamaterial absorber based on monolayer molybdenum disulfide

“…Figures 2(a)-2(f) describe the transverse electric field diagrams of the same wavelength under resonance and non-resonance, respectively, and comparative analysis. Under critical coupling, the electric field strength near the M-MoS 2 increases greatly with cavity excitation, [19] but the absorber is not excited at this time. However, there is a difference: at the nonresonant wavelength of 781 nm, the electric field strength distribution near the M-MoS 2 layer is very weak.…”