LED光源气溶胶探测雷达光学准直结构优化设计
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摘要
针对LED光源气溶胶探测光学雷达光能利用率偏低的问题,设计一种新型的雷达结构。它由双自由曲面准直匀光透镜和带有非球面镜的Kepler系统二级准直系统构成。准直透镜和Kepler系统前组单透镜使光聚焦于光阑处,再由带有非球面镜的透镜组准直出射。设计的仿真结果表明:光束发散角控制在3°以内,光能利用率达到43.027%,机械总长为207mm,与现有结构相比,光能利用率提高了12%,结构更为紧凑。
For the fact that the LED light source aerosol detection optical radar light energy utilization is low,the existing optical collimation structure is improved,which consists of a double free-form surface collimating uniform lens and a modified Kepler system secondary collimation system.The collimating lens and the Kepler system front single len focus on the light at the pupil,and it is collimated by a lens assembly with an aspherical mirror.The simulation results show that the beam divergence angle is controlled within 3°,that the light energy utilization rate is up to 43.027% and that the total mechanical length is 207 mm.Compared with the existing structure,the light energy utilization rate is increased by 12%,with the structure being more compact.
For the fact that the LED light source aerosol detection optical radar light energy utilization is low,the existing optical collimation structure is improved,which consists of a double free-form surface collimating uniform lens and a modified Kepler system secondary collimation system.The collimating lens and the Kepler system front single len focus on the light at the pupil,and it is collimated by a lens assembly with an aspherical mirror.The simulation results show that the beam divergence angle is controlled within 3°,that the light energy utilization rate is up to 43.027% and that the total mechanical length is 207 mm.Compared with the existing structure,the light energy utilization rate is increased by 12%,with the structure being more compact.
引文
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[2]钟文婷,华灯鑫,刘君,等.新型LED光源气溶胶探测雷达系统优化设计与初步实验[J].光学学报,2016,36(10):488-494.ZHONG Wenting,HUA Dengxin,LIU Jun,et al.Optimal design and preliminary experiments on new type of LED light source radar system for aerosol detection[J].Acta Optica Sinica,2016,36(10):488-494.
[3]钟文婷,刘君,华灯鑫,等.多波长发光二极管光源雷达系统与近地面低层大气气溶胶探测[J].物理学报,2018,67(18):184208.ZHONG Wenting,LIU Jun,HUA Dengxin,et al.Multi-wavelength light-emitting diode light source radar system and near-ground atmospheric aerosol detection[J].Acta Physica Sinica,2018,67(18):184208.
[4]KOYAMA M,SHIINA T.Development of LED minilidar[C]//IEEE CLEO/IQEC/PACIFIC RIM,2011:544-545.
[5]SHIINA T.Optical design and development of near range compact lidar[M]//SPIE:Optical Sensors and Biophotonics III,2011:831111.
[6]SHIINA T.LED mini-lidar for air and dust monitoring[M]//SPIE:International Symposium on Photoelectronic Detection and Imaging 2013:Laser Sensing and Imaging and Applications,2013:890533.
[7]钟文婷,华灯鑫,刘君,等.用于气溶胶探测光学雷达的LED光源的研制[J].西安理工大学学报,2018,34(1):6-13.ZHONG Wenting,HUA Dengxin,LIU Jun,et al.Development of LED light source for aerosol detection optical radar[J].Journal of Xi’an University of Technology,2018,34(1):6-13.
[8]狄慧鸽,华灯鑫,王玉峰,等.米散射激光雷达重叠因子及全程回波信号标定技术研究[J].物理学报,2013,62(9):242-248.DI Huige,HUA Dengxin,WANG Yufeng,et al.Investigation on the correction of the Mie scattering lidar’s overlapping factor and echo signals over the total detection range[J].Acta Physica Sinica,2013,62(9):242-248.
[9]赵欢,李长庚,陈志涛,等.基于双自由曲面的LED均匀照明准直透镜设计[J].光学学报,2017,37(4):256-261.ZHAO Huan,LI Changgeng,CHEN Zhitao,et al.Design of collimating lens with uniform illumination for LED based on double freeform surface[J].Acta Optica Sinica,2017,37(4):256-261.
[10]孟祥翔,刘伟奇,冯睿,等.双自由曲面LED均匀照明准直透镜设计[J].光子学报,2014,43(8):10-15.MENG Xiangxiang,LIU Weiqi,FENG Rui,et al.Design of LED collimator for uniform illumination with double freeform surfaces[J].Acta Photonica Sinica,2014,43(8):10-15.
[11]李庆扬,王能超,易大义.数值分析[M].北京:清华大学出版社,2008.
[12]潘浩,陈国庆,杜伯钧.基于三次样条的双自由曲面LED匀光透镜设计[J].激光与光电子学进展,2016,53(3):197-204.PAN Hao,CHEN Guoqing,DU Bojun.Design of double freeform surface lens for LED uniform illumination based on cubic splines[J].Laser&Optoelectronics Progress,2016,53(3):197-204.
[13]朱民,楼俊,潘玉珏,等.基于新型LED准直系统的自由曲面均匀照明设计[J].光学学报,2018,38(4):300-305.ZHU Min,LOU Jun,PAN Yujue,et al.Design of freeform surface with uniform illumination based on new LED collimation system[J].Acta Optica Sinica,2018,38(4):300-305.
[14]WANG Guangzhen,WANG Lili,Li Fuli,et al.Collimating lens for light-emitting-diode light source based on non-imaging optics[J].Applied Optics,2012,51(11):1654-1659.
[15]刘国强,赵恒,华灯鑫,等.基于自由曲面设计的LED光源系统光束准直研究[J].西安理工大学学报,2018,34(1):87-91.LIU Guoqiang,ZHAO Heng,HUA Dengxin,et al.Collimation of LED light source based on freeform surface[J].Journal of Xi’an University of Technology,2018,34(1):87-91.
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