Design Of Uniaxial Two-dimensional Scanning System For Lidar

Lidar,with its high accuracy,fast response speed,and high resolution,has been widely used in both civilian and military fields.The main direction of lidar development is to improve detection performance while simplifying the structure to achieve miniaturization.The two-dimensional scanning system is one of the core components of a scanning lidar,and the X-Y dual-axis structure of the mainstream two-dimensional scanning system currently used limits the integration of lidar systems.Therefore,researching and designing a small,portable,high-precision,and easy-to-integrate two-dimensional scanning system for lidar has significant practical value.This paper mainly studies and designs a single-axis two-dimensional scanning system based on a rotating double wedge prism.The specific work is as follows:(1)The research status of rotary double-prism scanning system at home and abroad is investigated.The research background and significance of this subject are introduced,and the research status and application requirements of rotary double-wedge prism scanning system at home and abroad are summarized.The content and objectives of the research are expounded,and the structure of this paper is clarified.(2)Optical design was performed for a rotating double-wedge prism scanning system using circular wedge prisms as the core components.Circular wedge prisms are chosen as the core components of the scanning system,and a two-dimensional optical scanning system model is established.The propagation trajectory of the beam is analyzed in depth,and a simplified model of the beam propagation trajectory in the rotating double circular wedge prisms is obtained.The simple forward and reverse functional relationship between the rotation angle of the double circular wedge prisms and the azimuth and zenith angles of the outgoing beam is derived,and the relevant parameters of the wedge prisms are optimized and designed.(3)Design and model the mechanical structure of a rotating double wedge prism scanning system using Solidworks software.Use Altium Designer software to design the circuit and select the hardware for the scanning system.(4)The software design for the rotating double-wedge prism scanning system is carried out.The control scheme of the system is designed as a whole,and the relevant software structure flowchart is provided,followed by program coding.(5)Simulation and analysis were performed to evaluate the performance of the rotating double-wedge prism scanning system.The research shows that the system can achieve arbitrary scanning of the outgoing beam within the range of 0-360° azimuth angle and 0-70.5°zenith angle.Using the example of displaying the laser radar beam scanning mode in a two-dimensional plane and displaying the laser radar beam scanning mode in terms of distance and altitude,perform a system simulation analysis.The simulation results indicate that when the zenith angle of the outgoing beam is fixed,the rotation angles of the two circular wedge prisms are strictly linearly related to the azimuth angle of the outgoing beam with a constant difference.When the azimuth angle of the outgoing beam is fixed,the rotation angles of the two circular wedge prisms are approximately linearly related to the zenith angle of the outgoing beam.(6)A comprehensive summary of the research content has been conducted,further clarifying the future research direction.