传统的Klett和Fernald反演气溶胶法依赖于消光系数和后向散射系数的假设关系, 给反演结果带来误差。 根据纯转动拉曼后向散射系数仅是大气温度和压强的函数, 设计的Raman-Mie方法用米散射和纯转动拉曼回波信号结合探空温度和大气压强共同反演气溶胶后向散射系数。 不仅消除了Klett和Fernald方法引入假设带来的误差, 还可避免因几何因子修正带来的影响。 最后将该方法用于实验室自行研制的拉曼-米散射激光雷达, 反演出了大气气溶胶后向散射系数廓线, 实验结果与Klett(Fernald)方法分别进行了比较。

Both the traditional Klett and Fernald methods used to obtain atmospheric aerosol backscattering coefficient require the hypothesis of relationship between the extinction coefficient and backscattering coefficient, and this will bring error. According to the theory that the pure rotational Raman backscattering coefficient is only related to atmospheric temperature and pressure, a new method is presented for inverting aerosol backscattering coefficient, which needed the intensity of elastic scattering and rotational Raman combined with atmospheric temperature and pressure obtained with the sounding balloons in this article. This method can not only eliminate the errors of the traditional Klett and Fernald methods caused by the hypothesis, but also avoid the error caused by the correction of the overlap. Finally, the aerosol backscattering coefficient was acquired by using this method and the data obtained via the Raman-Mie scattering Lidar of our lab. And the result was compared with that of Klett and Fernald.