拉曼-米激光雷达测温通道残余几何因子修正

The overlap functions of high- and low-order channels from Raman-Mie lidar are different due to the influence of optical devices and detectors in each channel, which will cause errors in temperature measurement near the ground. In order to solve this problem, a new method to correct the residual overlap of the temperature measurement channel was proposed. This method firstly calculated the ratio of the effective differential scattering cross section of the high- and low-quantum number Raman signals through the radiosonde temperature and the calibrated normalized spectral transmittance, and then the residual overlap profile was calibrated by the Raman signal intensity ratio. The effectiveness of this method was verified by the experimental data of Raman-Mie lidar. The results show that the effect of overlap on temperature retrievals can be exactly corrected using the new method, and can significantly improve the accuracy of temperature inversion near the ground, and enhance the detecting performance of pure rotational Raman-Mie lidar in the boundary layer.