摘要
差分波前激光雷达是基于双孔望远镜探测的激光回波波前差分抖动方差来探测大气光学湍流强度的雷达系统。为评估与优化系统探测大气湍流的性能,进行了数值仿真。基于波动光学理论、大气湍流相位屏模型和大气消光模型来模拟激光在垂直大气路径上的传输,并结合网格采样的优化设计,得到了激光光束在传播路径上不同位置的光强分布。利用非相干光源成像原理,根据不同传输路径处的后向散射光强分布得到了探测器上两个光斑图像的分布信息。根据仿真结果,随着湍流强度的提高,光束波前畸变程度加深。成像光斑直径随着探测高度的增大而减小,探测高度为10 km时,成像光斑直径减小到2.45×10^(-4)m。通过对比仿真的反演结果与仿真输入的HV5/7(Hufnagel-Valley 5/7)的结果,发现两者具有较高的一致性,这初步证明差分波前激光雷达探测大气湍流的原理及方法的可靠性。
Differential wavefront lidar is a lidar system for measuring the atmospheric optical turbulence intensity based on wavefront differential jitter variance of a laser echo detected by the two-aperture telescope.To evaluate and optimize the detection performance of this system for atmospheric optical turbulence,numerical simulations have been carried out.According to the wave optics theory,atmospheric turbulence phase screen model,and atmospheric extinction model,the propagation of laser beam in vertical atmospheric path is simulated.Combined with the optimized design of grid sampling,the intensity distribution of laser beam at different positions along the propagation path is obtained.Based on the principle of incoherent light source imaging,the distributions of two spot images on the detector are obtained according to the backscattered light intensity distributions at different transmission paths.According to the simulation results,we find that the degree of beam wavefront distortion is deepened with the increase of turbulence intensity.The diameter of the imaging spot decreases with the increase of the detection height.When the detection height is 10 km,the diameter of the imaging spot decreases to 2.45×10^(-4)m.By comparing the simulated inversion results with the results of the input HV5/7(Hufnagel Valley 5/7)in simulation,we find that the two have high consistency,which preliminarily proves the reliability of the principle and method of atmospheric turbulence detection by using the differential wavefront lidar.
作者
王彩玉
苑克娥
时东锋
黄见
陈欣欣
杨威
查林彬
Wang Caiyu;Yuan Kee;Shi Dongfeng;Huang Jian;Chen Xinxin;Yang Wei;Zha Linbin(Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,HFIPS,Chinese Academy of Sciences,Hefei,Anhui 230031,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei,Anhui 230026,China;Advanced Laser Technology Laboratory of Anhui Province,Hefei,Anhui 230037,China;State Key Laboratory of Pulsed Power Laser Technology,Hefei,Anhui 230037,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2021年第10期9-17,共9页
Acta Optica Sinica
基金
国家重点实验室开放研究基金(SKL2018ZR10)
国家自然科学基金(41475001)。
关键词
大气光学
差分波前激光雷达
波光学模拟
湍流相位屏
非相干成像
大气折射率结构常数
atmospheric optics
differential wavefront lidar
wave optics simulation
phase screens of turbulence
incoherent imaging
atmospheric refractive index structure constant
