IMPROVEMENT OF THE CAPABILITIES OF LIDAR SYSTEMS AT 1064 NM

Abstract

The lidar overlap function, which describes the overlap between the laser beam and the receiver field of view, can be determined experimentally for the 355 and 532 nm channels using Raman signals. Nevertheless, the Raman channels cannot be used to determine the lidar overlap for the infrared channel (1064 nm) because of their low intensity. In addition, the current technologies imply that many Raman lidar systems only measure inelastic signals with reasonable signal-to-noise ratio during night time. Our study presents a modification of Raman method, based on the comparison of attenuated backscatter profiles derived from lidar and ceilometer, to retrieve the overlap function for the lidar infrared channel.