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非同轴激光雷达由于存在发射激光与接收望远镜之间的不完全重叠区,造成近场回波信号与真实大气信号不一致.对于多波长激光雷达,这种不一致更为突出和复杂.然而,近场大气是人类活动最集中的区域,因此对多波长激光雷达近场信号进行校正,对于了解和探究边界层大气具有十分重要的意义.提出了一种利用粒子谱仪测量近地层气溶胶尺度谱分布并运用Mie散射理论和低层大气指数衰减规律,进而直接校正多波长激光雷达消光系数廓线近场信号的新方法.通过对晴天、多云天气和雾天多波长气溶胶消光系数廓线近场信号的校正,证明了该方法的可行性和实用性.该方法着重考虑了多波长激光雷达比的波长依赖性和气溶胶粒子谱分布的天气相关性,将该方法用于近地层大气消光系数廓线校正,减少了由于不考虑这两个因素带来的消光系数廓线反演和校正的不确定性.该方法对于研究不同天气情况下边界层内的大气气溶胶物理、光学特性具有一定的实用价值和借鉴意义.
Non-coaxial laser radar due to the presence of the laser and receiving telescope between the incomplete overlap region, resulting in near-field echo signal and the real atmospheric signal is not consistent for multi-wavelength laser radar, this inconsistency is more prominent and complex. However, near Field atmosphere is the most concentrated area of human activity, so correcting the near-field signal of multi-wavelength lidar is very important for understanding and exploring the boundary layer atmosphere.A particle size spectrometer is used to measure the aerosol scale spectrum The Mie scattering theory and the attenuation law of low-level atmospheric index are distributed and applied to directly correct the near-field signal of the extinction coefficient profile of multi-wavelength lidar.By analyzing the near field of the multi-wavelength aerosol extinction coefficient profiles in sunny, cloudy and foggy days, Signal calibration to prove the feasibility and practicability of this method.The method focuses on the weather dependence of the wavelength dependence of multiwavelength Lidar ratio and the distribution of aerosol particles.The method is applied to the atmospheric extinction coefficient profile The line correction reduces the uncertainty of the inversion and correction of the extinction coefficient profile due to ignoring these two factors The method for the study of atmospheric physics in different weather condition, boundary layer, the optical properties of a certain practical value and reference.