喇曼方法测量激光雷达常数研究  

Measurement of lidar constant by means of Raman method

作　　者：闫顺生[1,2] 张敬东[1] 黄洪云[1] 户立春[1] 边静[1] 

机构地区：[1]唐山学院基础教学部,唐山063000 [2]中国科学院安徽光学精密机械研究所,合肥230031

出　　处：《激光技术》2010年第2期221-223,共3页Laser Technology

摘　　要：为了标定激光雷达常数,在大气水平分布均匀的天气下,利用激光雷达喇曼散射回波不受大气气溶胶后向散射影响的特点,对其水平方向距离订正回波进行线性拟合,结合N_2分子喇曼后向散射截面和分子数密度就可以得到激光雷达常数;同时对这种方法进行了数值模拟,相对误差为4.688%,理论推导和数值模拟均证明该方法是可行的。结果表明,激光雷达常数的获取为激光系统的评估以及激光雷达方程的参量反演将带来便利。The characteristic that the return signals of a Raman lidar are not affected by aerosol backscattering can be used to calibrate lidar constant. At homogenous horizontal atmosphere, the lidar constant can be calculated with knowledge about Raman diffusion back scattering cross section and number density of N2. Numerical simulation was carried out and 4. 688% relative error of the lidar constant was obtained. Theoretical derivation and numerical simulation indicate the feasibility of the method. The achievement of lidar constant will offer convenience for retrieve of aerosol in lidar equation and evaluation of a lidar system.

关 键 词：大气与海洋光学 激光雷达常数 线性拟合 喇曼散射 

分 类 号：TN958.98[电子电信—信号与信息处理]