Research On Receiving Optical System With Large Field Of View For MEMS Lidar

MEMS laser radar with micro-mirror scanning can realize the intelligent control of field of view and resolution,to achieve the best match between the working parameters of laser radar and vehicle motion status,which is an important development direction of the vehicle laser radar.In this dissertation,based on the development of MEMS Lidar,the design of optical system for large-field-of-view gaze reception with unit detectors is studied,which aims to provide a receiving optical system for the MEMS Lidar under development in the research group.Based on the deep research of data,the paper presents the constraints and the energy transfer rules of the laser receiving optics system,and discusses the limitations of multi-lens structure design for large-field-of-view staring receiving optical system of unit detector.The light cone is introduced as a relay element,proposes a design scheme of large field of view gaze receiving optical system for unit detector,deduces the constraints of the design parameters of the optical system are deduced,and analysis of propagation of the optical path of the light cone.On this basis,the optical system is modeled and simulated by using Light tools software,gives the curves of the receiving efficiency with the length of the light cone,the taper,the parameters of the lens spacing,and finds that the receiving lens has the highest receiving efficiency when the receiving lens is tightly attached to the big end of the light cone,there is an optimum value for the length and taper of the light cone.When the plano-convex lens has a diameter of 10 mm and a focal length of 15 mm,and the light cone is in close contact with the large end,the best length of the light cone is 14 mm and the diameter of the small end is 2.2 mm.The receiving efficiency is 96.45%when the viewing angle is 15°,which meets the design requirements.Experimentally,the processing of the receiving optical system and the construction of the optical path are completed,and the variation of the receiving efficiency with the field of view and the distribution of the output spot are tested,which is in accordance with the law of the theoretical design curve,for the research group MEMS Lidar to explore a wide field of view receiving optical system design.